Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of silicon nitride ceramic with high thermal conductivity
The invention relates to a preparation method of silicon nitride ceramic with high thermal conductivity. The preparation method comprises the following steps: (1) selecting alpha-Si3N4 powder, beta-Si3N4 powder and sintering aid powder as raw materials; (2) proportioning the mixed powder raw materials selected in the step (1) according to a certain proportion, carrying out vacuum ball milling for 24-48 hours, fully wet-mixing, and drying in a vacuum drying oven to obtain a mixed raw material; (3) pre-pressing and molding the mixed raw material obtained in the step (2), loading into a graphite mold, carrying out high-temperature treatment on the mixed powder in a low-pressure environment through a hot-pressing sintering furnace, and then adding the mixed raw material again for secondary vacuum ball milling; and (4) pre-pressing and molding the secondary spheroidal graphite mixed raw material obtained in the step (3), assembling a pyrophyllite composite block, and sintering at high temperature and high pressure by using a cubic hydraulic press to complete the preparation of the high-thermal-conductivity silicon nitride ceramic. The large-particle silicon nitride seed crystal is prepared under the vacuum condition, so that the silicon nitride mixed powder continues to crystallize under high-pressure driving, and the thermal conductivity of the silicon nitride ceramic is improved. The operability is high.
本发明涉及一种高热导率氮化硅陶瓷的制备方法，步骤①、选取α‑Si3N4、β‑Si3N4粉末和烧结助剂粉末为原料；②、将上述①中选取的混合粉末原料按照一定的比例进行配料，真空球磨24‑48h充分湿混后，利用真空干燥箱中烘干得到混合原料；③、将②中获得的混合原料预压成型，装入石墨模具中，通过热压烧结炉在低压环境下对混合粉体进行高温处理后，再次添加混合原料进行二次真空球磨；④、将③中获得的二次球墨混合原料预压成型，组装叶腊石复合块，利用六面顶液压机在高温高压下烧结，完成高热导率氮化硅陶瓷的制备。本申请真空条件下制备大颗粒氮化硅晶种，使氮化硅混合粉体在高压驱动下继续结晶，提高氮化硅陶瓷热导率。可操作性强。
Preparation method of silicon nitride ceramic with high thermal conductivity
The invention relates to a preparation method of silicon nitride ceramic with high thermal conductivity. The preparation method comprises the following steps: (1) selecting alpha-Si3N4 powder, beta-Si3N4 powder and sintering aid powder as raw materials; (2) proportioning the mixed powder raw materials selected in the step (1) according to a certain proportion, carrying out vacuum ball milling for 24-48 hours, fully wet-mixing, and drying in a vacuum drying oven to obtain a mixed raw material; (3) pre-pressing and molding the mixed raw material obtained in the step (2), loading into a graphite mold, carrying out high-temperature treatment on the mixed powder in a low-pressure environment through a hot-pressing sintering furnace, and then adding the mixed raw material again for secondary vacuum ball milling; and (4) pre-pressing and molding the secondary spheroidal graphite mixed raw material obtained in the step (3), assembling a pyrophyllite composite block, and sintering at high temperature and high pressure by using a cubic hydraulic press to complete the preparation of the high-thermal-conductivity silicon nitride ceramic. The large-particle silicon nitride seed crystal is prepared under the vacuum condition, so that the silicon nitride mixed powder continues to crystallize under high-pressure driving, and the thermal conductivity of the silicon nitride ceramic is improved. The operability is high.
本发明涉及一种高热导率氮化硅陶瓷的制备方法，步骤①、选取α‑Si3N4、β‑Si3N4粉末和烧结助剂粉末为原料；②、将上述①中选取的混合粉末原料按照一定的比例进行配料，真空球磨24‑48h充分湿混后，利用真空干燥箱中烘干得到混合原料；③、将②中获得的混合原料预压成型，装入石墨模具中，通过热压烧结炉在低压环境下对混合粉体进行高温处理后，再次添加混合原料进行二次真空球磨；④、将③中获得的二次球墨混合原料预压成型，组装叶腊石复合块，利用六面顶液压机在高温高压下烧结，完成高热导率氮化硅陶瓷的制备。本申请真空条件下制备大颗粒氮化硅晶种，使氮化硅混合粉体在高压驱动下继续结晶，提高氮化硅陶瓷热导率。可操作性强。
Preparation method of silicon nitride ceramic with high thermal conductivity
一种高热导率氮化硅陶瓷的制备方法
E YUANLONG (Autor:in) / JIA HONGSHENG (Autor:in) / ZHANG YONG (Autor:in) / ZHANG YUMEI (Autor:in) / NING YUNYU (Autor:in) / LI SIQI (Autor:in)
09.07.2024
Patent
Elektronische Ressource
Chinesisch
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