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Preparation method of high-strength wear-resistant porous silicon nitride and product thereof
The invention discloses a preparation method of high-strength wear-resistant porous silicon nitride and a product thereof, and the method comprises the following steps: uniformly mixing silicon powder with a PVA aqueous solution, then adding a pore-forming agent, uniformly mixing, then pressing into a green body with a certain size, heating the green body, then removing the pore-forming agent and PVA, and sequentially carrying out vacuum presintering and reactive sintering to obtain the high-strength wear-resistant porous silicon nitride. The addition amount of the pore-forming agent particles is 10-50% of the total mass of the silicon powder and the pore-forming agent. The high-porosity porous silicon nitride is prepared by adding the pore-forming agent, the mechanical property of the porous silicon nitride is improved by pre-sintering the porous silicon blank at different temperatures and for different times in a vacuum atmosphere before reactive sintering, the bending strength of the porous silicon nitride is improved by 2-4 times after pre-sintering, the application range of the porous silicon nitride is widened, and the porous silicon nitride has good application prospects. And pores in the sintered porous silicon nitride can well maintain the original shape and size of the pore-forming agent.
本发明公开了一种高强度耐磨损多孔氮化硅的制备方法及其产品，该方法包括以下步骤：将硅粉与PVA水溶液混合均匀，再加入成孔剂，混合均匀，随后压制成一定尺寸的坯体，坯体加热后去除成孔剂和PVA，依次进行真空预烧结和反应烧结，制得高强度多孔氮化硅，成孔剂颗粒的加入量为硅粉和成孔剂总质量的10～50％。本发明采用添加成孔剂的方法制备高孔隙率多孔的氮化硅，通过反应烧结前在真空气氛下对多孔硅坯体进行不同温度和时间预烧结的方法来提高多孔氮化硅的力学性能，经预烧结后，多孔氮化硅的抗弯强度提高了2～4倍，拓宽了其应用范围，且烧结后多孔氮化硅中的孔隙能够较好的保持成孔剂原有的形状和尺寸。
Preparation method of high-strength wear-resistant porous silicon nitride and product thereof
The invention discloses a preparation method of high-strength wear-resistant porous silicon nitride and a product thereof, and the method comprises the following steps: uniformly mixing silicon powder with a PVA aqueous solution, then adding a pore-forming agent, uniformly mixing, then pressing into a green body with a certain size, heating the green body, then removing the pore-forming agent and PVA, and sequentially carrying out vacuum presintering and reactive sintering to obtain the high-strength wear-resistant porous silicon nitride. The addition amount of the pore-forming agent particles is 10-50% of the total mass of the silicon powder and the pore-forming agent. The high-porosity porous silicon nitride is prepared by adding the pore-forming agent, the mechanical property of the porous silicon nitride is improved by pre-sintering the porous silicon blank at different temperatures and for different times in a vacuum atmosphere before reactive sintering, the bending strength of the porous silicon nitride is improved by 2-4 times after pre-sintering, the application range of the porous silicon nitride is widened, and the porous silicon nitride has good application prospects. And pores in the sintered porous silicon nitride can well maintain the original shape and size of the pore-forming agent.
本发明公开了一种高强度耐磨损多孔氮化硅的制备方法及其产品，该方法包括以下步骤：将硅粉与PVA水溶液混合均匀，再加入成孔剂，混合均匀，随后压制成一定尺寸的坯体，坯体加热后去除成孔剂和PVA，依次进行真空预烧结和反应烧结，制得高强度多孔氮化硅，成孔剂颗粒的加入量为硅粉和成孔剂总质量的10～50％。本发明采用添加成孔剂的方法制备高孔隙率多孔的氮化硅，通过反应烧结前在真空气氛下对多孔硅坯体进行不同温度和时间预烧结的方法来提高多孔氮化硅的力学性能，经预烧结后，多孔氮化硅的抗弯强度提高了2～4倍，拓宽了其应用范围，且烧结后多孔氮化硅中的孔隙能够较好的保持成孔剂原有的形状和尺寸。
Preparation method of high-strength wear-resistant porous silicon nitride and product thereof
一种高强度耐磨损多孔氮化硅的制备方法及其产品
CUI XIONGHUA (author) / ZHANG LEI (author) / YANG ZHEYI (author) / CUI JINWEN (author) / WANG HONGZHE (author)
2022-09-09
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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