阅读说明：本技术 一种缠绕工艺适用陶瓷先驱体浆料及其制备方法 (Ceramic precursor slurry applicable to winding process and preparation method thereof ) 是由 丁振杰 何利娜 沈伟 程鹏辉 朱隆嘉 于 2021-10-29 设计创作，主要内容包括：本发明涉及一种缠绕工艺适用陶瓷先驱体浆料及其制备方法,该浆料包括以下重量份数的组分：聚硅氮烷树脂100份、惰性填料10～150份、活性填料10～150份、触变剂10～20份、促进剂1～5份；该方法包括以下步骤：取聚硅氮烷树脂和促进剂混合均匀,然后加入触变剂、惰性填料、活性填料,经过滤得到目的产物。本发明陶瓷先驱体的骨架结构链Si-C、Si-N与生成的碳化硅、氮化硅等陶瓷的元素组成一致,先驱体在高温无机化过程中仅有部分侧基发生断裂而损失,具有高的陶瓷产率。与现有技术相比,本发明制备的陶瓷先驱体浆料粘度适中,填料分散性好,储存期长,具有低的固化交联温度和低的陶瓷烧成温度,成型后的固化物无开裂,陶瓷产率较高,且制备工艺简单,效率高。(The invention relates to a ceramic precursor slurry applicable to a winding process and a preparation method thereof, wherein the slurry comprises the following components in parts by weight: 100 parts of polysilazane resin, 10-150 parts of inert filler, 10-150 parts of active filler, 10-20 parts of thixotropic agent and 1-5 parts of accelerator; the method comprises the following steps: the polysilazane resin and the accelerant are taken and mixed evenly, then the thixotropic agent, the inert filler and the active filler are added, and the target product is obtained by filtration. The skeleton structure chain Si-C, Si-N of the ceramic precursor is consistent with the element composition of the generated ceramics such as silicon carbide, silicon nitride and the like, only partial side groups of the precursor are broken and lost in the high-temperature inorganic process, and the ceramic precursor has high ceramic yield. Compared with the prior art, the ceramic precursor slurry prepared by the invention has moderate viscosity, good filler dispersibility, long storage period, low curing and crosslinking temperature and low ceramic firing temperature, no cracking of the formed cured product, high ceramic yield, simple preparation process and high efficiency.)

1. A ceramic precursor slurry applicable to a winding process is characterized by comprising the following components in parts by weight: 100 parts of polysilazane resin, 10-150 parts of inert filler, 10-150 parts of active filler, 10-20 parts of thixotropic agent and 1-5 parts of accelerator.

2. The paste of claim 1, wherein the polysilazane resin is a liquid vinyl polysilazane resin.

3. The paste of claim 2, wherein the liquid vinyl polysilazane resin has a molecular weight of less than 1.0 x 10³。

4. The paste of claim 2, wherein the liquid vinyl polysilazane resin has the formula:

wherein n is 5-10.

5. The ceramic precursor slurry applicable to the winding process according to claim 1, wherein the inert filler is one or more of silicon dioxide powder, silicon nitride powder, silicon carbide powder, boron nitride powder and aluminum oxide powder.

6. The ceramic precursor slurry applicable to the winding process as claimed in claim 1, wherein the inert filler has a particle size of 0.1-100 μm.

7. The ceramic precursor slurry applicable to the winding process as claimed in claim 1, wherein the active filler is a pure metal or an intermetallic compound, and comprises one or more of aluminum, chromium, zirconium, chromium silicide, molybdenum silicide, and titanium silicide.

8. The ceramic precursor slurry applicable to the winding process as claimed in claim 1, wherein the thixotropic agent is one or more of fumed silica, bentonite and attapulgite.

9. The ceramic precursor slurry applicable to the winding process according to claim 1, wherein the accelerant is one or more of methyl ethyl ketone peroxide, dibenzoyl peroxide, tert-butyl peroxybenzoate, dicumyl peroxide and chloroplatinic acid.

10. The method of claim 1, further comprising the steps of:

the polysilazane resin and the accelerant are taken and mixed evenly, then the thixotropic agent, the inert filler and the active filler are added, and the target product is obtained by filtration.

Technical Field

The invention belongs to the technical field of ceramic precursors, and relates to ceramic precursor slurry applicable to a winding process and a preparation method thereof.

Background

In recent years, with the rapid development of the application of high-temperature resistant continuous fiber reinforced ceramic matrix composite materials in high-tech fields such as aerospace structural components, high-temperature engines, nuclear reactors and the like, ceramic matrix materials with good manufacturability are urgently needed. The traditional preparation process of the ceramic material comprises the following steps: the preparation of micro powder, compression molding, sintering and processing, but the traditional method has complex preparation process, high sintering temperature, serious damage to the fiber in the ceramic preparation process and poor material reliability. The composite material prepared by infiltrating the ceramic matrix into the fiber preform by adopting the chemical vapor deposition method has good high-temperature resistance and can be produced automatically, but the production period is long, the requirement on equipment is high, the gas and energy consumption is large, the cost is high, the thickness of the prepared material is limited, and the application space of the method has great limitation. Therefore, the precursor polymer is receiving more and more attention due to its advantages of strong structure designability, excellent molding processability, and capability of preparing various forms of ceramic materials.

Aiming at the application requirement of preparing the ceramic matrix composite preform by the winding process, the key technical problem is to select a precursor polymer with proper viscosity, and the viscosity depends on the composition of ceramic precursor slurry. At present, domestic ceramic precursors mainly comprise polycarbosilane, polysilazane and polysiloxane. Polycarbosilane is a solid polymer precursor with a linear structure, needs to be dissolved or melted in a solvent and then is subjected to cross-linking forming, and the process is complex; the polysiloxane has low viscosity, and the temperature resistance of the polysiloxane is difficult to meet the application requirements. Polysilazane is selected as a precursor resin, but the viscosity of the polysilazane is too low to meet the viscosity requirement of a winding process for preparing a ceramic matrix composite preform, the resin content after winding is low, the cured product is high in brittleness and easy to crack, and the ceramic yield is low, so that the development of ceramic precursor slurry suitable for the winding process is needed.

Disclosure of Invention

The invention aims to provide a ceramic precursor slurry suitable for a winding process and a preparation method thereof, so as to overcome the defects of low precursor resin viscosity, low ceramic yield, easy cracking of a cured product and the like in the prior art.

The purpose of the invention can be realized by the following technical scheme:

one of the technical schemes of the invention provides ceramic precursor slurry applicable to a winding process, which comprises the following components in parts by weight: 100 parts of polysilazane resin, 10-150 parts of inert filler, 10-150 parts of active filler, 10-20 parts of thixotropic agent and 1-5 parts of accelerator.

Further, the polysilazane resin is liquid vinyl polysilazane resin.

Further, the molecular weight of the liquid vinyl polysilazane resin is less than 1.0 x 10³。

Further, the liquid vinyl polysilazane resin has the structural formula:

wherein n is 5-10, and n can be 5, 6, 7, 8, 9 or 10.

Further, the inert filler is one or more of silicon dioxide powder, silicon nitride powder, silicon carbide powder, boron nitride powder and aluminum oxide powder.

Furthermore, the particle size of the inert filler is 0.1-100 μm.

Further, the active filler is pure metal or intermetallic compound, including one or more of aluminum, chromium, zirconium, chromium silicide, molybdenum silicide and titanium silicide.

Further, the thixotropic agent is one or more of fumed silica, bentonite and attapulgite.

Further, the accelerant is one or more of methyl ethyl ketone peroxide, dibenzoyl peroxide, tert-butyl peroxybenzoate, dicumyl peroxide and chloroplatinic acid.

The second technical scheme of the invention provides a preparation method of the ceramic precursor slurry, which comprises the following steps:

the polysilazane resin and the accelerant are taken and mixed evenly, then the thixotropic agent, the inert filler and the active filler are added, and the target product is obtained by filtration.

The skeleton structure chain Si-C, Si-N of the ceramic precursor is consistent with the element composition of the generated ceramics such as silicon carbide, silicon nitride and the like, only part of side groups of the precursor are broken and lost in the high-temperature inorganic process, and the volume shrinkage caused in the cracking process of the precursor is reduced by adding the active filler and the inert filler.

The liquid vinyl polysilazane resin in the ceramic precursor slurry of the invention is a polymer containing a-Si-N-repeating unit, and can be converted into SiCN ceramic by pyrolysis. In the invention, the addition of the accelerator is beneficial to the curing and crosslinking of vinyl in the slurry components at low temperature, so that the yield of the final ceramic is increased; the active filler can react with Si generated in the cracking process of the liquid vinyl polysilazane resin at high temperature to generate silicide microcrystals, and can promote the ceramic transformation process of the liquid vinyl polysilazane resin, and the finally formed cracking product is amorphous SiCN ceramic, Si₃N₄The crystal grains such as SiC, silicide microcrystal and the like are dispersed and embedded in the amorphous ceramics, so that the strength of the material is improved; the inert filler does not undergo chemical change in the cracking process of the liquid vinyl polysilazane resin, but can inhibit the volume shrinkage of a ceramic product to a certain extent and reduce the cost; the thixotropic agent is added to adjust the viscosity of the precursor slurry to meet the use requirements of the winding process.

The invention limits the component proportion of the ceramic precursor slurry system, and has three main reasons: firstly, the viscosity requirement (500-1000 mP & s) of a winding process is met; secondly, the interface bonding force between the precursor slurry and the reinforcement is improved; thirdly, the ceramic yield is improved, and the pores of the ceramic matrix after carbonization are reduced. If the composition of the ceramic precursor slurry system exceeds the ratio limit, the above requirements cannot be satisfied. If the addition amount of the accelerator is too large, the crosslinking reaction is too violent, the product performance is adversely affected, and the product cannot be used; on the contrary, the crosslinking reaction rate is too slow, the reaction time is increased, and the efficiency is low. If the inert filler or the active filler is added too much, the problems of precursor slurry viscosity increase, fiber reinforcement yarn breakage and the like can be caused; if the inert filler or the active filler is added too little, the interface bonding strength of the precursor slurry and the reinforcement is weakened, and a ceramic matrix with higher density cannot be obtained. If the amount of the thixotropic agent is too much, the viscosity of the precursor slurry is too high, and the use requirement of a winding process cannot be met; if the thixotropic agent is added too little, the viscosity of the precursor slurry is too low, and the interface interaction is weak when the precursor slurry is compounded with the reinforcement.

Compared with the prior art, the invention has the following beneficial effects:

(1) the ceramic precursor slurry prepared by the invention has moderate viscosity, and can meet the viscosity requirement of preparing a ceramic matrix composite prefabricated part by a winding process;

(2) the ceramic precursor slurry prepared by the invention has higher ceramic yield, the skeleton structure chain Si-C, Si-N of the ceramic precursor is consistent with the element composition of the generated ceramics such as silicon carbide, silicon nitride and the like, and only part of side groups of the ceramic precursor are broken and lost in the high-temperature inorganic process;

(3) the ceramic precursor slurry prepared by the invention has low curing and crosslinking temperature and low ceramic firing temperature, the curing of the precursor can be completed at the temperature below 200 ℃, the formed cured product has no crack and can be demoulded by mechanical processing, and the cured and crosslinked product can be cracked at the temperature of 1200 ℃, so that the energy consumption is reduced;

(4) the ceramic precursor slurry prepared by the invention has good manufacturability, can be used for forming and preparing the ceramic matrix composite prefabricated body by adopting mature winding process and equipment, and has simpler forming process, higher efficiency and lower cost compared with the traditional braid dipping-curing-cracking process, thereby updating and enriching the preparation process of the ceramic matrix composite material.

Detailed Description

The present invention will be described in detail with reference to specific examples. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

In the following examples, the starting materials and treatment steps used are, unless otherwise specified, indicated by the conventional commercial products or conventional techniques.

In the following examples, the vinyl polysilazane resin used was purchased from Kuebi chemical (Shanghai) Co., Ltd., brand 8812.

In the following examples, the inert filler (silica powder, silicon nitride powder, silicon carbide powder, boron nitride powder, alumina powder) used had a particle size of 0.1 to 100. mu.m.

Example 1:

the preparation method of the ceramic precursor slurry suitable for the winding process comprises the following steps:

(1) weighing 100 parts of vinyl polysilazane resin in a charging barrel according to the mass ratio, adding 2 parts of dicumyl peroxide under continuous stirring, and stirring for 30min to obtain a uniform transparent solution;

(2) weighing 10 parts of fumed silica according to the mass ratio, adding the fumed silica into the transparent solution obtained in the step (1), stirring until uniform liquid is obtained, then adding 50 parts of silica powder, 50 parts of silicon carbide powder and 10 parts of chromium silicide, and grinding, dispersing and stirring to obtain slurry with certain viscosity; after filtering, discharging and subpackaging to obtain the target product.

The viscosity, curing and crosslinking temperature, ceramization temperature and ceramic yield of the prepared ceramic precursor slurry are shown in table 1, respectively. Compared with the ceramic precursor slurry prepared in the comparative example 1, the curing and crosslinking temperature of the ceramic precursor slurry of the embodiment is reduced and the ceramic yield is improved after the dicumyl peroxide promoter is added, which shows that the addition of the dicumyl peroxide promoter is beneficial to curing and crosslinking vinyl in the slurry components at a low temperature and the final ceramic yield is increased. Compared with the ceramic precursor slurry prepared in the comparative example 2, after the thixotropic agent, namely fumed silica, is added into the ceramic precursor slurry, the viscosity of the precursor slurry is improved, and the curing and crosslinking temperature is reduced. Compared with the ceramic precursor slurry prepared in the comparative example 3, after the inert filler silicon dioxide powder and silicon carbide powder are added into the ceramic precursor slurry, the viscosity of the slurry is improved, the curing and crosslinking temperature is reduced, and the ceramic yield is improved. Compared with the ceramic precursor slurry prepared in the comparative example 4, the ceramic precursor slurry of the embodiment has the advantages that after the active filler chromium carbide is added, the viscosity of the slurry is improved, and the ceramic yield is improved.

The ceramic precursor slurry prepared in the embodiment is used as glue solution, the carbon fiber is used as reinforcement, the ceramic precursor slurry and the reinforcement are compounded, and the ceramic matrix composite prefabricated member is prepared by adopting a winding process. And after winding is finished, closing the mold, pressurizing the product by screwing down the screw, curing for 2-8 h in an oven at 120-200 ℃, and demolding and taking out after the sample is naturally cooled to obtain the ceramic matrix composite prefabricated part. And (3) placing the ceramic matrix composite prefabricated member in a carbonization furnace, heating to 1000-1200 ℃ in a nitrogen atmosphere for ceramic cracking for 2-6 h, and cooling a sample to obtain the ceramic matrix composite.

Example 2:

the preparation method of the ceramic precursor slurry system suitable for the winding process comprises the following steps:

(1) weighing 100 parts of vinyl polysilazane resin in a charging barrel according to the mass ratio, adding 1 part of dicumyl peroxide under continuous stirring, and stirring for 30min to obtain a uniform transparent solution;

(2) weighing 20 parts of fumed silica according to the mass ratio, adding the fumed silica into the transparent solution obtained in the step (1), stirring until uniform liquid is obtained, then adding 50 parts of silica powder, 50 parts of silicon carbide powder and 15 parts of chromium silicide, and grinding, dispersing and stirring to obtain slurry with certain viscosity; after filtering, discharging and subpackaging to obtain the target product. The viscosity, curing and crosslinking temperature, ceramization temperature and ceramic yield of the prepared ceramic precursor slurry are shown in table 1, respectively.

The ceramic precursor slurry prepared in the embodiment is used as glue solution, the carbon fiber is used as reinforcement, the ceramic precursor slurry and the reinforcement are compounded, and the ceramic matrix composite prefabricated member is prepared by adopting a winding process. And after winding is finished, closing the mold, pressurizing the product by screwing down the screw, curing for 2-8 h in an oven at 120-200 ℃, and demolding and taking out after the sample is naturally cooled to obtain the ceramic matrix composite prefabricated part. And (3) placing the ceramic matrix composite prefabricated member in a carbonization furnace, heating to 1000-1200 ℃ in a nitrogen atmosphere for ceramic cracking for 2-6 h, and cooling a sample to obtain the ceramic matrix composite.

Example 3:

the preparation method of the ceramic precursor slurry system suitable for the winding process comprises the following steps:

(1) weighing 100 parts of vinyl polysilazane resin in a charging barrel according to the mass ratio, adding 1 part of dicumyl peroxide under continuous stirring, and stirring for 30min to obtain a uniform transparent solution;

(2) weighing 20 parts of fumed silica according to the mass ratio, adding the fumed silica into the transparent solution obtained in the step (1), stirring until uniform liquid is obtained, then adding 60 parts of silica powder, 70 parts of silicon carbide powder and 20 parts of molybdenum silicide, and grinding, dispersing and stirring to obtain slurry with certain viscosity; after filtering, discharging and subpackaging to obtain the target product. The viscosity, curing and crosslinking temperature, ceramization temperature and ceramic yield of the prepared ceramic precursor slurry are shown in table 1, respectively.

The ceramic precursor slurry prepared in the embodiment is used as glue solution, the carbon fiber is used as reinforcement, the ceramic precursor slurry and the reinforcement are compounded, and the ceramic matrix composite prefabricated member is prepared by adopting a winding process. And after winding is finished, closing the mold, pressurizing the product by screwing down the screw, curing for 2-8 h in an oven at 120-200 ℃, and demolding and taking out after the sample is naturally cooled to obtain the ceramic matrix composite prefabricated part. And (3) placing the ceramic matrix composite prefabricated member in a carbonization furnace, heating to 1000-1200 ℃ in a nitrogen atmosphere for ceramic cracking for 2-6 h, and cooling a sample to obtain the ceramic matrix composite.

Example 4:

the preparation method of the ceramic precursor slurry system suitable for the winding process comprises the following steps:

(1) weighing 100 parts of vinyl polysilazane resin in a charging barrel according to the mass ratio, adding 1.5 parts of dicumyl peroxide under continuous stirring, and stirring for 30min to obtain a uniform transparent solution;

(2) weighing 15 parts of fumed silica according to the mass ratio, adding the fumed silica into the transparent solution obtained in the step (1), stirring until uniform liquid is obtained, then adding 80 parts of silica powder, 10 parts of silicon carbide powder and 20 parts of aluminum, and grinding, dispersing and stirring to obtain slurry with certain viscosity;

(3) dispersing the slurry by a three-roll mill to obtain slurry with the fineness of less than 10 microns, filtering, discharging and packaging to obtain the target product. The viscosities of the prepared ceramic precursor slurries are shown in table 1.

The ceramic precursor slurry prepared in the embodiment is used as glue solution, the carbon fiber is used as reinforcement, the ceramic precursor slurry and the reinforcement are compounded, and the ceramic matrix composite prefabricated member is prepared by adopting a winding process. And after winding is finished, closing the mold, pressurizing the product by screwing down the screw, curing for 2-8 h in an oven at 120-200 ℃, and demolding and taking out after the sample is naturally cooled to obtain the ceramic matrix composite prefabricated part. And (3) placing the ceramic matrix composite prefabricated member in a carbonization furnace, heating to 1000-1200 ℃ in a nitrogen atmosphere for ceramic cracking for 2-6 h, and cooling a sample to obtain the ceramic matrix composite.

Example 5:

the preparation method of the ceramic precursor slurry system suitable for the winding process comprises the following steps:

(1) weighing 100 parts of vinyl polysilazane resin in a charging barrel according to the mass ratio, adding 1 part of dicumyl peroxide under continuous stirring, and stirring for 30min to obtain a uniform transparent solution;

(2) weighing 10 parts of fumed silica according to the mass ratio, adding the fumed silica into the transparent solution obtained in the step (1), stirring until uniform liquid is obtained, then adding 110 parts of silica powder, 10 parts of silicon carbide powder and 10 parts of chromium silicide, and grinding, dispersing and stirring to obtain slurry with certain viscosity; after filtering, discharging and subpackaging to obtain the target product. The viscosity, curing and crosslinking temperature, ceramization temperature and ceramic yield of the prepared ceramic precursor slurry are shown in table 1, respectively.

The ceramic precursor slurry prepared in the embodiment is used as glue solution, the carbon fiber is used as reinforcement, the ceramic precursor slurry and the reinforcement are compounded, and the ceramic matrix composite prefabricated member is prepared by adopting a winding process. And after winding is finished, closing the mold, pressurizing the product by screwing down the screw, curing for 2-8 h in an oven at 120-200 ℃, and demolding and taking out after the sample is naturally cooled to obtain the ceramic matrix composite prefabricated part. And (3) placing the ceramic matrix composite prefabricated member in a carbonization furnace, heating to 1000-1200 ℃ in a nitrogen atmosphere for ceramic cracking for 2-6 h, and cooling a sample to obtain the ceramic matrix composite.

Example 6:

most of the examples were the same as example 1 except that in this example, 50 parts of silica powder and 50 parts of silicon carbide powder were changed to 5 parts of silica powder and 5 parts of silicon carbide powder.

Example 7:

most of the examples were the same as example 1 except that 50 parts of silica powder and 50 parts of silicon carbide powder were changed to 50 parts of silica powder and 100 parts of silicon carbide powder in this example.

Example 8:

most of the examples were the same as example 1 except that in this example, 50 parts of silica powder and 50 parts of silicon carbide powder were changed to 100 parts of silica powder.

Example 9:

most of the examples were the same as example 1 except that in this example, 50 parts of silica powder and 50 parts of silicon carbide powder were changed to 100 parts of silicon nitride powder.

Example 10:

most of the examples were the same as example 1, except that in this example, 50 parts of silica powder and 50 parts of silicon carbide powder were changed to 100 parts of silicon carbide powder.

Example 11:

most of the examples were the same as example 1 except that in this example, 50 parts of silica powder and 50 parts of silicon carbide powder were changed to 100 parts of boron nitride powder.

Example 12:

most of the examples were the same as example 1 except that in this example, 50 parts of silica powder and 50 parts of silicon carbide powder were changed to 100 parts of alumina powder.

Example 13:

most of the examples were the same as example 1 except that 50 parts of silica powder and 50 parts of silicon carbide powder were changed to 50 parts of silica powder, 20 parts of silicon nitride powder and 30 parts of silicon carbide powder.

Example 14:

most of them are the same as those in example 3 except that in this example, the molybdenum silicide was changed to 150 parts by 20 parts.

Example 15:

most of them are the same as example 3 except that in this example, 20 parts of molybdenum silicide was changed to 10 parts of molybdenum silicide.

Example 16:

most of the same is true as in example 3, except that in this example 20 parts molybdenum silicide is replaced by 20 parts chromium.

Example 17:

most of the same is true as in example 3, except that in this example 20 parts molybdenum silicide is replaced with 20 parts zirconium.

Example 18:

most of the same is true as in example 3, except that in this example 20 parts of molybdenum silicide is replaced by 20 parts of chromium silicide.

Example 19:

most of the same is true as in example 3, except that in this example 20 parts of molybdenum silicide is replaced by 20 parts of titanium silicide.

Example 20:

most of the same is compared to example 3, except that in this example 20 parts molybdenum silicide is changed to 10 parts aluminum, 3 parts zirconium and 7 parts chromium silicide.

Example 21:

most of the same is true compared to example 1, except that in this example, 10 parts fumed silica is 10 parts bentonite.

Example 22:

most of the same is true as in example 1, except that in this example, 10 parts fumed silica is replaced with 10 parts attapulgite.

Example 23:

most of the results were the same as those in example 1, except that in this example, 10 parts of fumed silica was changed to 3 parts of attapulgite, 3 parts of fumed silica, and 4 parts of bentonite.

Example 24:

in comparison with example 1, the majority are the same, except that in this example, 2 parts dicumyl peroxide is replaced by 2 parts methyl ethyl ketone peroxide.

Example 25:

compared to example 1, most of the same except that in this example, 2 parts dicumyl peroxide was changed to 2 parts dibenzoyl peroxide.

Example 26:

compared to example 1, most of them are the same except that in this example, 2 parts of dicumyl peroxide is changed to 2 parts of tert-butyl peroxybenzoate.

Example 27:

compared to example 1, most of them are the same except that in this example, 2 parts of dicumyl peroxide is changed to 2 parts of chloroplatinic acid.

Example 28:

compared to example 1, most of them are the same except that in this example, 2 parts of dicumyl peroxide are changed to 0.5 parts of dibenzoyl peroxide, 0.5 parts of tert-butyl peroxybenzoate and 1 part of dicumyl peroxide.

Example 29:

compared to example 1, most of them are the same except that in this example, 2 parts dicumyl peroxide is changed to 5 parts dicumyl peroxide.

Comparative example 1:

compared to example 1, most of them are the same except that no promoter dicumyl peroxide is added.

Comparative example 2:

compared to example 1, is largely identical except that no thixotropic agent fumed silica is added.

Comparative example 3:

compared with example 1, the method is mostly the same except that silica powder and silicon carbide powder which are inert fillers are not added.

Comparative example 4:

compared with example 1, the method is largely the same except that no active filler chromium carbide is added.

TABLE 1 data table of properties of ceramic precursor slurries

The ceramic precursor slurry prepared by the embodiment has moderate viscosity, good filler dispersibility and long storage period, and does not settle within 3 months; the curing and crosslinking temperature and the ceramic firing temperature are low, the curing of the precursor can be completed at the temperature below 200 ℃, the formed cured product has no crack and can be demoulded by mechanical processing, and the cured and crosslinked product can be cracked at the temperature of 1200 ℃, so that the energy consumption is reduced, the fiber damage can be reduced, and the high-temperature resistance of the material can be improved. In addition, the preparation of the ceramic matrix composite can be completed without adding a sintering aid.

The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.