阅读说明：本技术 一种凝胶离心成型制备的TiC-316L复合材料 (TiC-316L composite material prepared by gel centrifugal forming ) 是由 李冬 于 2018-07-06 设计创作，主要内容包括：为了改善不锈钢粉末冶金零件的硬度、耐磨性,设计了一种凝胶离心成型制备的TiC-316L复合材料。采用316L气雾化不锈钢粉末为原料,经过配料、球磨、干燥、制粒、成形、球磨、凝胶离心工艺成功制备了具有优异力学性能的凝胶离心成型制备的TiC-316L复合材料。其中,所研制的凝胶离心成型制备的TiC-316L复合材料,强度高于普通压制成型的坯体,并且坯体具有机加工性,经真空脱胶烧结,1380℃保温1h可制备出316L-TiC合金管,烧结体收缩均匀无变形。所制得的凝胶离心成型制备的TiC-316L复合材料,其硬度、致密化程度、抗弯强度都得到大幅提升。本发明能够为制备高性能的TiC-316L复合材料提供一种新的生产工艺。(In order to improve the hardness and the wear resistance of stainless steel powder metallurgy parts, a TiC-316L composite material prepared by gel centrifugal forming is designed. 316L gas atomized stainless steel powder is used as a raw material, and the TiC-316L composite material prepared by gel centrifugal forming with excellent mechanical property is successfully prepared by the processes of material preparation, ball milling, drying, granulation, forming, ball milling and gel centrifugation. The strength of the TiC-316L composite material prepared by the developed gel centrifugal molding is higher than that of a blank formed by ordinary pressing, the blank has machinability, a 316L-TiC alloy pipe can be prepared by vacuum degumming and sintering and heat preservation at 1380 ℃ for 1h, and a sintered body is uniform in shrinkage and free of deformation. The hardness, the densification degree and the bending strength of the TiC-316L composite material prepared by the prepared gel centrifugal forming are greatly improved. The invention can provide a new production process for preparing the high-performance TiC-316L composite material.)

1. The TiC-316L composite material prepared by gel centrifugal forming comprises the following raw materials: 316L gas atomized stainless steel powder, TiC powder.

2. The TiC-316L composite material prepared by gel centrifugal forming of claim 1, wherein the TiC-316L composite material prepared by gel centrifugal forming is prepared by the following steps: weighing and proportioning original powder according to an experimental design scheme, pouring the weighed and proportioned powder into a ball mill for wet milling, wherein a ball milling medium is absolute ethyl alcohol, after the ball milling is finished, carrying out vacuum drying on prepared granules, then adding a forming agent for granulation, adding the prepared powder into a high-speed rotating centrifugal die, then putting the centrifugal die into a vacuum sintering furnace for sintering, wherein the sintering temperature is 1350 ℃, and the heat preservation time is 60 min.

3. The TiC-316L composite material prepared by gel centrifugal forming of claim 1, wherein the TiC-316L composite material prepared by gel centrifugal forming is detected by the following steps: the viscosity of the slurry is measured by an NDJ8 type rotary viscometer, the density of a green body is measured by an Archimedes method, the bending strength of the green body is measured by a CT405 electronic material mechanical property tester, the granularity analysis is performed by a MASTER2000 granularity analyzer, the surface roughness is measured by a TAL1000 surface profile instrument, the microscopic structure is observed by a JSM1002 metallographic microscope, the hardness is measured by a DH100 type micro Vickers hardness tester, and the tensile property is measured by a CM510 type universal tester.

4. The TiC-316L composite material prepared by gel centrifugal forming according to claim 1, wherein the TiC-316L composite material prepared by gel centrifugal forming has good dispersibility of 316L-TiC composite powder in a toluene-hydroxyethyl methacrylate gel system, the optimal solid content of slurry with stability and good fluidity is 72% by using oleic acid as a dispersing agent, the TiC-316L composite material prepared by gel centrifugal forming is divided into three processes of exhausting, discharging and pressure curing, the curing of the gel system can be accelerated by pressure in the forming process, the performance of a blank body can be directly influenced by the centrifugal speed, the optimal speed is 2798r/min, and the TiC-316L composite material prepared by gel centrifugal forming can be prepared by using a gel centrifugal forming process and has the strength of 38MPa, The 316L-TiC green body with the relative density of 70 percent is close to the density of a green body formed by common pressing, but the strength is higher than that of the green body formed by common pressing, the green body has machinability, the 316L-TiC alloy pipe can be prepared by vacuum degumming and sintering, and the temperature is kept at 1380 ℃ for 1h, and a sintered body is uniformly shrunk and has no deformation.

Technical Field

The invention relates to a powder metallurgy material, in particular to a TiC-316L composite material prepared by gel centrifugal forming.

Background

TiC is light gray, is cubic, is insoluble in water, has high chemical stability, hardly reacts with hydrochloric acid and sulfuric acid, can be dissolved in aqua regia, nitric acid and hydrofluoric acid, and can also be dissolved in a solution of an alkaline oxide. TiC is an iron gray crystal with metallic luster, belongs to a NaCl type simple cubic structure, carbon atoms and titanium atoms are equivalent at lattice positions, and the TiC atoms are combined by strong covalent bonds, have a plurality of characteristics similar to metals, such as high melting point, boiling point and hardness, hardness is second only to that of diamond, good heat conduction and electric conductivity are realized, and even superconductivity is realized at extremely low temperature. TiC is widely used for manufacturing metal ceramics, heat-resistant alloys, hard alloys, wear-resistant materials, high-temperature radiation materials and other high-temperature vacuum devices, and the complex phase materials prepared by the TiC have wide application in the fields of machining, metallurgical mineral products, aerospace, fusion reactors and the like.

The new technology of gel-casting process was invented by the united states at the end of the 20 th century for the preparation of ceramics. The technical characteristics are as follows: the organic additive has low organic monomer content, high product size precision and high blank strength, can be mechanically processed, is obviously superior to the forming process of other ceramic parts with complex shapes, does not contain residual impurities after the organic additive is burnt, and is widely applied to the production of high-quality precise ceramic elements with special shapes. The application field is as follows: the process technology is concerned about in the fields of ceramics, refractory materials, powder metallurgy and the like, and is applied to the research and production processes of materials such as silicon carbide, silicon nitride, sialon, zirconia, alumina, magnesia-alumina spinel, metal ceramics and the like.

Disclosure of Invention

The invention aims to improve the hardness and the wear resistance of stainless steel powder metallurgy parts and designs a TiC-316L composite material prepared by gel centrifugal forming.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the TiC-316L composite material prepared by gel centrifugal forming comprises the following raw materials: gas atomization of stainless steel powder, TiC powder.

The preparation method of the TiC-316L composite material prepared by gel centrifugal forming comprises the following steps: weighing and proportioning the original powder according to an experimental design scheme, pouring the mixture into a ball mill for wet milling after proportioning, wherein a ball milling medium is absolute ethyl alcohol. After the ball milling is finished, the prepared granules are dried in vacuum, and then a forming agent is added for granulation. The prepared powder was added to a high speed rotating centrifugal mold. And then placing the mixture into a vacuum sintering furnace for sintering, wherein the sintering temperature is 1350 ℃, and the heat preservation time is 60 min.

The detection steps of the TiC-316L composite material prepared by gel centrifugal forming are as follows: the viscosity of the slurry is measured by an NDJ8 type rotary viscometer, the density of a green body is measured by an Archimedes method, the bending strength of the green body is measured by a CT405 electronic material mechanical property tester, the granularity analysis is performed by a MASTER2000 granularity analyzer, the surface roughness is measured by a TAL1000 surface profile instrument, the microscopic structure is observed by a JSM1002 metallographic microscope, the hardness is measured by a DH100 type micro Vickers hardness tester, and the tensile property is measured by a CM510 type universal tester.

In the TiC-316L composite material prepared by gel centrifugal forming, 316L-TiC composite powder has good dispersibility in a toluene-hydroxyethyl methacrylate gel system, and oleic acid is used as a dispersing agent to prepare stable slurry with good fluidity, wherein the optimal solid content is 80%.

According to the TiC-316L composite material prepared by gel centrifugal forming, the gel centrifugal forming is divided into three processes of exhausting, glue discharging and pressure curing, the curing of a gel system can be accelerated by pressure in the forming process, the performance of a blank body is directly influenced by the centrifugal rotating speed, and the optimal rotating speed is 2798 r/min.

The TiC-316L composite material prepared by gel centrifugal molding can prepare a 316L-TiC blank with the strength of 38MPa and the relative density of 70 percent by utilizing a gel centrifugal molding process, the density of the 316L-TiC blank is close to that of a blank formed by ordinary pressing, but the strength of the 316L-TiC blank is higher than that of the blank formed by ordinary pressing, the blank has machinability, and a 316L-TiC alloy pipe can be prepared by vacuum degumming and sintering and heat preservation at 1380 ℃ for 1h, and a sintered body is uniform in shrinkage and free from deformation.

The invention has the beneficial effects that:

316L gas atomized stainless steel powder is used as a raw material, and the TiC-316L composite material prepared by gel centrifugal forming with excellent mechanical property is successfully prepared by the processes of material preparation, ball milling, drying, granulation, forming and ball milling. Wherein, various performance indexes of the developed powder metallurgy sight glass base reach the corresponding requirements of an inlet piece, and the developed powder metallurgy sight glass base can be put into batch production. The hardness, the densification degree and the bending strength of the TiC-316L composite material prepared by the prepared gel centrifugal forming are greatly improved. The invention can provide a new production process for preparing the high-performance TiC-316L composite material.

Detailed Description