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SiC/Si3N4 composite material as well as preparation method and application thereof
The invention relates to the technical field of composite materials, in particular to a SiC/Si3N4 composite material and a preparation method and application thereof. The preparation method comprises the following steps: A) injecting slurry containing carbon fibers and a binder into a mold, and preserving heat for 2-3 hours under the conditions of 1.5-2.5 MPa and 180-190 DEG C to obtain a cured material; b) carrying out heat preservation on the cured material at the temperature of 1000-1200 DEG C for 3-5 hours to obtain a carbonized material; c) under the protection of inert gas, carrying out gas-phase siliconizing on the carbonized material subjected to demolding treatment under the condition of 1700-1800 DEG C to obtain a silicon carbide composite material; and D) cooling the silicon carbide composite material to 1200-1350 DEG C, and introducing nitrogen for nitridation reaction to obtain the SiC/Si3N4 composite material. The composite material is very low in thermal expansion coefficient, and the density is remarkably reduced compared with a metal material.
本申请涉及复合材料技术领域，特别涉及一种SiC/Si3N4复合材料及其制备方法和应用。该制备方法包括如下步骤：A)将包括碳纤维和粘结剂的浆料注入模具中，在1.5～2.5MPa、180℃～190℃的条件下保温2～3h得到固化材料；B)将固化材料在1000℃～1200℃的条件下保温3～5h得到碳化材料；C)在惰性气体保护下，在1700℃～1800℃的条件下对脱模处理后的碳化材料进行气相渗硅，得到碳化硅复合材料；D)将碳化硅复合材料降温至1200℃～1350℃，通入氮气进行氮化反应，以得到SiC/Si3N4复合材料。该复合材料的热膨胀系数很低，密度相对于金属材料显著降低。
SiC/Si3N4 composite material as well as preparation method and application thereof
The invention relates to the technical field of composite materials, in particular to a SiC/Si3N4 composite material and a preparation method and application thereof. The preparation method comprises the following steps: A) injecting slurry containing carbon fibers and a binder into a mold, and preserving heat for 2-3 hours under the conditions of 1.5-2.5 MPa and 180-190 DEG C to obtain a cured material; b) carrying out heat preservation on the cured material at the temperature of 1000-1200 DEG C for 3-5 hours to obtain a carbonized material; c) under the protection of inert gas, carrying out gas-phase siliconizing on the carbonized material subjected to demolding treatment under the condition of 1700-1800 DEG C to obtain a silicon carbide composite material; and D) cooling the silicon carbide composite material to 1200-1350 DEG C, and introducing nitrogen for nitridation reaction to obtain the SiC/Si3N4 composite material. The composite material is very low in thermal expansion coefficient, and the density is remarkably reduced compared with a metal material.
本申请涉及复合材料技术领域，特别涉及一种SiC/Si3N4复合材料及其制备方法和应用。该制备方法包括如下步骤：A)将包括碳纤维和粘结剂的浆料注入模具中，在1.5～2.5MPa、180℃～190℃的条件下保温2～3h得到固化材料；B)将固化材料在1000℃～1200℃的条件下保温3～5h得到碳化材料；C)在惰性气体保护下，在1700℃～1800℃的条件下对脱模处理后的碳化材料进行气相渗硅，得到碳化硅复合材料；D)将碳化硅复合材料降温至1200℃～1350℃，通入氮气进行氮化反应，以得到SiC/Si3N4复合材料。该复合材料的热膨胀系数很低，密度相对于金属材料显著降低。
SiC/Si3N4 composite material as well as preparation method and application thereof
一种SiC/Si3N4复合材料及其制备方法和应用
LI ZHIJIE (author) / MA FEI (author) / GUO LINGYAN (author) / ZENG XIAOXIAO (author) / SHI XIANGDONG (author) / ZHAI CHANGHUI (author)
2024-01-16
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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