阅读说明：本技术 一种薄型石英陶瓷部件及其高效制备方法 (Thin quartz ceramic component and efficient preparation method thereof ) 是由 翟萍 王洪升 陈达谦 韦其红 栾强 周长灵 王长征 于 2019-03-20 设计创作，主要内容包括：本发明涉及一种薄型石英陶瓷部件及其高效制备方法。通过添加活性剂对熔融石英粉料进行改性,减少细粉颗粒团聚效应,进而降低成型和烧成缺陷,采取干压与冷等静压组合的成型工艺实现均匀、高效的素坯制备,引入高表面能的纳米粉体来促进熔融石英陶瓷的烧结,使熔融石英在不析晶或微晶条件下实现致密化,保持优异的综合性能。该制备方法科学合理,简单易行,便于实施。采用该方法制备的薄型石英陶瓷部件无表面肉眼可见气孔、斑点等缺陷、强度高、透波性好、部件410℃保温30min后水冷处理三次,无裂纹,抗热震性好。随炉试样强度≥50MPa,介电常数2.98-3.04之间,1200℃保温5min后水冷样的强度≥43MPa。(The invention relates to a thin quartz ceramic component and an efficient preparation method thereof. The method has the advantages that the fused quartz powder is modified by adding the active agent, the agglomeration effect of fine powder particles is reduced, the forming and sintering defects are further reduced, the uniform and efficient biscuit preparation is realized by adopting a forming process combining dry pressing and cold isostatic pressing, the sintering of the fused quartz ceramic is promoted by introducing the high-surface-energy nano powder, the fused quartz is densified under the condition of no crystallization or microcrystal, and the excellent comprehensive performance is kept. The preparation method is scientific and reasonable, simple and easy to implement and convenient to implement. The thin quartz ceramic part prepared by the method has no defects such as pores and spots visible to naked eyes on the surface, high strength and good wave permeability, is subjected to water cooling treatment for three times after the part is subjected to heat preservation at 410 ℃ for 30min, and has no cracks and good thermal shock resistance. The strength of the furnace sample is more than or equal to 50MPa, the dielectric constant is between 2.98 and 3.04, and the strength of the water-cooled sample is more than or equal to 43MPa after heat preservation at 1200 ℃ for 5 min.)

1. A high-efficiency preparation method of a thin quartz ceramic component is characterized by comprising the following steps:

preparing part molding powder by using micron quartz powder and nano quartz powder as raw materials;

sieving the dried part molding powder, and modifying the part molding powder by using an active agent to obtain a granulation material;

the granulated material is formed by a combination mode of dry pressing and cold isostatic pressing, and then is sintered and processed to prepare the thin quartz ceramic component.

2. The method for efficiently manufacturing a thin quartz ceramic part according to claim 1, wherein the part-molding powder is prepared from the raw materials of micron quartz powder, nano quartz powder and alcohol compounds.

3. The method for efficiently manufacturing a thin quartz ceramic component according to claim 1, wherein the blank is subjected to creep feed and micro-feed grinding by a machine tool to obtain an inner circle profile with a precision and a surface quality meeting requirements, and then the thin quartz ceramic component is manufactured by clamping by an outer circle special tool completely attached to the inner circle profile and grinding by the machine tool through creep feed and micro-feed grinding.

4. The method for efficiently manufacturing a thin quartz ceramic component according to claim 1, wherein the mass ratio of the micron quartz powder, the nanometer quartz powder and the alcohol compound is 100: 3-15: 50-240.

5. The method for efficiently manufacturing a thin quartz ceramic part according to claim 1, wherein the activating agent is deionized water in an amount of 8 to 20% by mass based on the part molding powder.

6. The method for efficiently manufacturing a thin quartz ceramic component according to claim 1, wherein the dry pressure is 10-20MPa, and the cold isostatic pressure is 120-220 MPa.

7. The method for efficiently manufacturing a thin quartz ceramic part according to claim 1, wherein the green compact is subjected to a drying treatment after the dry pressing and before the cold isostatic pressing.

8. The method for efficiently manufacturing a thin quartz ceramic component as claimed in claim 1, wherein the firing temperature is 1160-1200 ℃.

9. A thin quartz ceramic component, characterized by being produced by the method according to any one of claims 1 to 8.

10. The thin quartz ceramic component of claim 9, wherein the thin quartz ceramic component has a wall thickness of 0.8 to 1.2 mm.

Technical Field

The invention belongs to the field of ceramic wave-transmitting materials, and particularly relates to a thin quartz ceramic component and an efficient preparation method thereof.

Background

The fused quartz ceramic material has the advantages of high temperature resistance, corrosion resistance, thermal shock resistance and microwave transmission, is a microwave transmission material with excellent performance, and is widely applied to different fields. At present, most of quartz ceramic parts achieving mass production scale adopt slip casting or slip casting process. The two processes are complicated, the prepared biscuit has high water content, long-time drying by accurately controlling temperature and humidity, long period and low production efficiency. In order to obtain higher biscuit strength, more organic additives are often introduced during molding, the pores of a blank are increased due to volatilization of a large amount of additives in a degreasing stage, internal stress of a product is increased when gas is not smoothly discharged, and further defects such as air holes, deformation or cracking are generated, particularly when the thickness of the product is as low as 1mm, the defects are more remarkably influenced in a processing stage, and the yield is seriously reduced.

Disclosure of Invention

In order to solve the above-mentioned problems, it is an object of the present invention to provide a thin quartz ceramic component and a method for efficiently producing the same.

According to one aspect of the present invention, there is provided a method for preparing a low melting point phosphate material having wave-transmitting properties, comprising the steps of:

preparing part molding powder by using micron quartz powder and nano quartz powder as raw materials;

sieving the dried part molding powder, and modifying the part molding powder by using an active agent to obtain a granulation material;

the granulated material is formed by a combination mode of dry pressing and cold isostatic pressing, and then is sintered and processed to prepare the thin quartz ceramic component.

Furthermore, the micron quartz powder, the nanometer quartz powder and the alcohol compound are used as raw materials to prepare part molding powder.

Wherein the micron quartz powder is in a molten state, the purity is more than or equal to 99.7 percent, and the median particle size is less than or equal to 15 mu m;

the nano quartz powder is hydrophilic group, the purity is more than or equal to 99.5 percent, and the median particle size D50 is less than 15 nm.

Further, the blank is subjected to slow feeding and micro-feed grinding by a machine tool to obtain an inner circle profile with the precision and the surface quality meeting the requirements, then the outer circle special tool clamp completely attached to the inner circle profile is used for clamping, and the thin quartz ceramic component is manufactured by the machine tool through slow feeding and micro-feed grinding.

The mass ratio of the micron quartz powder, the nanometer quartz powder and the alcohol compound is 100: 3-15: 50-240. The nano quartz powder and alcohol compounds are subjected to ultrasonic dispersion for 20-40min in advance and then mixed with micron quartz powder, low-abrasion silicon nitride balls are used as grinding media, and the ratio of the material balls to the material balls is 1: 2 ball milling for 16-20 h. Wherein the alcohol compound comprises absolute ethyl alcohol

The material sieving sieve is one or more of 35-mesh, 50-mesh and 80-mesh plastic analysis sieves.

The active agent is deionized water, and the dosage of the active agent is 8-20% of the mass of the part molding powder.

The dry pressure is 10-20MPa, and the cold isostatic pressure is 120-220 MPa.

After dry pressing, the green body is subjected to drying treatment before cold isostatic pressing, wherein the drying treatment temperature is 100-120 ℃, and the treatment time is 8-20 h.

Furthermore, the sintering temperature is 1160-.

And (3) removing impurities from the processed quartz ceramic part to obtain the required thin quartz ceramic part, wherein the impurity removing process comprises iron removal and plastic removal. The impurity removal process comprises the step of heat treatment, wherein the heat treatment temperature is 500-750 ℃.

According to another aspect of the present invention, there is provided a thin quartz ceramic component, produced according to the method.

The wall thickness of the thin quartz ceramic component is 0.8-1.2 mm.

The specification of the main raw materials used in the invention is as follows:

micron quartz powder: the purity is more than or equal to 99.7 percent and the D50 is less than or equal to 15 mu m in a molten state;

nano quartz powder: the purity is more than or equal to 99.5 percent and the D50 is less than or equal to 15 nm;

anhydrous ethanol: it is commercially available.

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

according to the thin quartz ceramic part and the efficient preparation method thereof disclosed by the invention, the fused quartz powder is modified by adding the active agent, the agglomeration effect of fine powder particles is reduced, the forming and sintering defects are further reduced, the uniform and efficient biscuit preparation is realized by adopting a forming process combining dry pressing and cold isostatic pressing, the sintering of the fused quartz ceramic is promoted by introducing the high-surface-energy nano powder, the fused quartz is densified under the condition of no crystallization or microcrystal, and the excellent comprehensive performance is kept. The preparation method is scientific and reasonable, simple and easy to implement and convenient to implement. The thin quartz ceramic part prepared by the method has no defects such as pores and spots visible to naked eyes on the surface, high strength and good wave permeability, is subjected to water cooling treatment for three times after the part is subjected to heat preservation at 410 ℃ for 30min, and has no cracks and good thermal shock resistance. The strength of the furnace sample is more than or equal to 50MPa, the dielectric constant is between 2.98 and 3.04, and the strength of the water-cooled sample is more than or equal to 43MPa after heat preservation at 1200 ℃ for 5 min.

Detailed Description

In order to better understand the technical scheme of the invention, the invention is further explained by combining the specific embodiments in the specification.