Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of silicon nitride-hafnium carbide composite ceramic
The invention belongs to the technical field of ceramic materials and specifically relates to a preparation method of silicon nitride-hafnium carbide composite ceramic. The silicon nitride-hafnium carbide composite ceramic is prepared from the following raw materials in percentage by weight: 70-90% of metal silicon powder, 6-22% of hafnium carbide, 2-5% of zirconiumboride, and 1-3% of AlON-bonded spinel. The preparation method comprises the following steps: the raw materials and a medium are ball-milled to obtain an evenly mixed slurry, and drying and sieving the slurry to obtain pre-molded powder; putting the pre-molded powder in a die and pressing into a biscuit, and performing isostatic cool pressing treatment on the biscuit to obtain a pre-sintered body; putting the pre-sintered body into a vacuum sintered furnace and introducing nitrogen for sintering, thereby obtaining the silicon nitride-hafnium carbide composite ceramic. Compared with gas pressure sintered or hot-pressing sintered silicon nitride and the composite ceramic thereof, the silicon nitride-hafnium carbide composite ceramic has better hardness, bending strength and fracture toughness; the product size does not shrink, and the semi-finished product is machinable and suitable for preparing the products in complex shapes; in addition, the preparation method is simple and convenient to operate, and applicable to large-scale industrial production.
Preparation method of silicon nitride-hafnium carbide composite ceramic
The invention belongs to the technical field of ceramic materials and specifically relates to a preparation method of silicon nitride-hafnium carbide composite ceramic. The silicon nitride-hafnium carbide composite ceramic is prepared from the following raw materials in percentage by weight: 70-90% of metal silicon powder, 6-22% of hafnium carbide, 2-5% of zirconiumboride, and 1-3% of AlON-bonded spinel. The preparation method comprises the following steps: the raw materials and a medium are ball-milled to obtain an evenly mixed slurry, and drying and sieving the slurry to obtain pre-molded powder; putting the pre-molded powder in a die and pressing into a biscuit, and performing isostatic cool pressing treatment on the biscuit to obtain a pre-sintered body; putting the pre-sintered body into a vacuum sintered furnace and introducing nitrogen for sintering, thereby obtaining the silicon nitride-hafnium carbide composite ceramic. Compared with gas pressure sintered or hot-pressing sintered silicon nitride and the composite ceramic thereof, the silicon nitride-hafnium carbide composite ceramic has better hardness, bending strength and fracture toughness; the product size does not shrink, and the semi-finished product is machinable and suitable for preparing the products in complex shapes; in addition, the preparation method is simple and convenient to operate, and applicable to large-scale industrial production.
Preparation method of silicon nitride-hafnium carbide composite ceramic
GUO RUIBEN (Autor:in) / SUN ZHAOJIANG (Autor:in) / SUN BAIZHONG (Autor:in)
06.05.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
Nano silicon nitride-silicon carbide composite ceramic and preparation method thereof
| Europäisches Patentamt | 2024
| Europäisches Patentamt | 2015
Porous silicon nitride-silicon carbide composite ceramic material and preparation method thereof
| Europäisches Patentamt | 2015
Porous silicon nitride/silicon carbide composite ceramic material and preparation method thereof
| Europäisches Patentamt | 2015
COMPOSITION AND PREPARATION FOR HAFNIUM CARBIDE CERAMIC PRECURSOR
| Europäisches Patentamt | 2022