Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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High-strength silicon nitride composite silicon carbide ceramic as well as preparation method and application thereof
The invention relates to the field of composite materials, and specially relates to high-strength silicon nitride composite silicon carbide ceramic. The method includes reasonably proportioning raw material components, combining with a nitriding sintering process, preheating to 600-800 DEG C, and introducing nitrogen; heating the raw material mixture in a non-nitrogen atmosphere; preheating silicon powder, and introducing nitrogen; in the presence of silicon nitride in the raw materials, enabling silicon powder to be catalyzed and nitrided, promoting silicon nitride formation, increasing the silicon powder nitriding rate, promoting silicon nitride formed by silicon powder to be combined with silicon nitride in the raw materials in a liquid phase, realizing silicon carbide powder interpenetration, enhancing the bonding strength of silicon nitride and silicon carbide, and improving the compactness of the ceramic material; through reasonable time introduction of nitrogen, decomposition ofsilicon nitride at 1600 DEG C or above is avoided, strength and compactness of the ceramic material are enhanced, the density of a sintered product is larger than 2.65 g/cm < 3 >, the section is fine, pores are invisible, the thermal shock resistance of the ceramic material is improved, and the service life of the ceramic product is prolonged.
本发明涉及复合材料领域，尤其是高强度氮化硅复合碳化硅陶瓷，经过原料成分合理配比，结合氮化烧结工艺，采用先预热至600‑800℃时，通入氮气方式，使原料混合物在非氮气氛围下受热，使得硅粉预热，再结合氮气通入，以及原料中氮化硅存在的环境下，实现对硅粉催化氮化，促使氮化硅形成，提高硅粉氮化率，促进硅粉形成的氮化硅与原料中的氮化硅在液相下结合，实现在碳化硅粉末间穿插，增强氮化硅与碳化硅结合的强度，提高陶瓷材料的致密性；且经氮气合理时间通入，避免了氮化硅在1600℃以上发生分解，增强了陶瓷材料强度和致密性，使得烧结制品的的密度＞2.65g/cm，断面细腻，气孔不可见，提高了陶瓷材料的抗热震性能和延长了陶瓷制品的使用寿命。
High-strength silicon nitride composite silicon carbide ceramic as well as preparation method and application thereof
The invention relates to the field of composite materials, and specially relates to high-strength silicon nitride composite silicon carbide ceramic. The method includes reasonably proportioning raw material components, combining with a nitriding sintering process, preheating to 600-800 DEG C, and introducing nitrogen; heating the raw material mixture in a non-nitrogen atmosphere; preheating silicon powder, and introducing nitrogen; in the presence of silicon nitride in the raw materials, enabling silicon powder to be catalyzed and nitrided, promoting silicon nitride formation, increasing the silicon powder nitriding rate, promoting silicon nitride formed by silicon powder to be combined with silicon nitride in the raw materials in a liquid phase, realizing silicon carbide powder interpenetration, enhancing the bonding strength of silicon nitride and silicon carbide, and improving the compactness of the ceramic material; through reasonable time introduction of nitrogen, decomposition ofsilicon nitride at 1600 DEG C or above is avoided, strength and compactness of the ceramic material are enhanced, the density of a sintered product is larger than 2.65 g/cm < 3 >, the section is fine, pores are invisible, the thermal shock resistance of the ceramic material is improved, and the service life of the ceramic product is prolonged.
本发明涉及复合材料领域，尤其是高强度氮化硅复合碳化硅陶瓷，经过原料成分合理配比，结合氮化烧结工艺，采用先预热至600‑800℃时，通入氮气方式，使原料混合物在非氮气氛围下受热，使得硅粉预热，再结合氮气通入，以及原料中氮化硅存在的环境下，实现对硅粉催化氮化，促使氮化硅形成，提高硅粉氮化率，促进硅粉形成的氮化硅与原料中的氮化硅在液相下结合，实现在碳化硅粉末间穿插，增强氮化硅与碳化硅结合的强度，提高陶瓷材料的致密性；且经氮气合理时间通入，避免了氮化硅在1600℃以上发生分解，增强了陶瓷材料强度和致密性，使得烧结制品的的密度＞2.65g/cm，断面细腻，气孔不可见，提高了陶瓷材料的抗热震性能和延长了陶瓷制品的使用寿命。
High-strength silicon nitride composite silicon carbide ceramic as well as preparation method and application thereof
高强度氮化硅复合碳化硅陶瓷及其制备方法和应用
WEI YICHENG (Autor:in) / ZENG XIAOFENG (Autor:in) / CHEN JUXI (Autor:in) / ZENG QINGDANG (Autor:in)
07.08.2020
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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