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Method for uniformly coating silicon nitride sintering aid by utilizing coprecipitation reaction
The invention relates to the technical field of silicon nitride ceramic materials, in particular to a method for uniformly coating a silicon nitride sintering aid by utilizing a coprecipitation reaction. Aiming at the requirement of sintering silicon nitride on the uniformity of the sintering aid, uniform coating of the sintering aid is realized through coprecipitation reaction, and the method comprises the following steps: firstly, sequentially adding aluminum nitrate, yttrium nitrate and ferric chloride into water to form a sintering aid precursor solution; then adding urea and silicon nitride powder into the raw material solution to form a suspension containing coprecipitation ions; and carrying out water bath heat treatment and drying treatment on the suspension to obtain the silicon nitride formula powder uniformly coated with the sintering aid. According to the method for uniformly coating the silicon nitride sintering aid, the coating precipitation effect is good, nano-scale uniform coating of the sintering aid can be realized on the surface of the silicon nitride powder, the process is simple, the pH value is easy to control, and the method is convenient to popularize; the method is suitable for preparation and product production of related silicon nitride materials such as high-thermal-conductivity silicon nitride, high-density silicon nitride and high-hardness silicon nitride.
本发明涉及氮化硅陶瓷材料技术领域，具体为一种利用共沉淀反应均匀包覆氮化硅烧结助剂的方法。针对烧结氮化硅对烧结助剂均匀性要求，通过共沉淀反应实现烧结助剂均匀包覆，首先将硝酸铝、硝酸钇和氯化铁依次加入水中，形成烧结助剂前驱体溶液；然后将尿素和氮化硅粉体加入原料溶液中形成含有共沉淀离子的悬浮液；对悬浮液进行水浴热处理及干燥处理，得到烧结助剂均匀包覆的氮化硅配方粉体。本发明均匀包覆氮化硅烧结助剂的方法，不仅包覆沉淀效果好，能在氮化硅粉体的表面实现烧结助剂的纳米级均匀包覆，且工艺简单，pH值容易控制，便于推广，适用于高导热氮化硅、高致密度氮化硅和高硬度氮化硅等相关氮化硅材料制备和产品生产。
Method for uniformly coating silicon nitride sintering aid by utilizing coprecipitation reaction
The invention relates to the technical field of silicon nitride ceramic materials, in particular to a method for uniformly coating a silicon nitride sintering aid by utilizing a coprecipitation reaction. Aiming at the requirement of sintering silicon nitride on the uniformity of the sintering aid, uniform coating of the sintering aid is realized through coprecipitation reaction, and the method comprises the following steps: firstly, sequentially adding aluminum nitrate, yttrium nitrate and ferric chloride into water to form a sintering aid precursor solution; then adding urea and silicon nitride powder into the raw material solution to form a suspension containing coprecipitation ions; and carrying out water bath heat treatment and drying treatment on the suspension to obtain the silicon nitride formula powder uniformly coated with the sintering aid. According to the method for uniformly coating the silicon nitride sintering aid, the coating precipitation effect is good, nano-scale uniform coating of the sintering aid can be realized on the surface of the silicon nitride powder, the process is simple, the pH value is easy to control, and the method is convenient to popularize; the method is suitable for preparation and product production of related silicon nitride materials such as high-thermal-conductivity silicon nitride, high-density silicon nitride and high-hardness silicon nitride.
本发明涉及氮化硅陶瓷材料技术领域，具体为一种利用共沉淀反应均匀包覆氮化硅烧结助剂的方法。针对烧结氮化硅对烧结助剂均匀性要求，通过共沉淀反应实现烧结助剂均匀包覆，首先将硝酸铝、硝酸钇和氯化铁依次加入水中，形成烧结助剂前驱体溶液；然后将尿素和氮化硅粉体加入原料溶液中形成含有共沉淀离子的悬浮液；对悬浮液进行水浴热处理及干燥处理，得到烧结助剂均匀包覆的氮化硅配方粉体。本发明均匀包覆氮化硅烧结助剂的方法，不仅包覆沉淀效果好，能在氮化硅粉体的表面实现烧结助剂的纳米级均匀包覆，且工艺简单，pH值容易控制，便于推广，适用于高导热氮化硅、高致密度氮化硅和高硬度氮化硅等相关氮化硅材料制备和产品生产。
Method for uniformly coating silicon nitride sintering aid by utilizing coprecipitation reaction
一种利用共沉淀反应均匀包覆氮化硅烧结助剂的方法
WANG JINGYANG (author) / SUN LUCHAO (author) / YE CHAOCHAO (author) / CUI YANG (author) / DU TIEFENG (author)
2023-06-06
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
Densification of Silicon Nitride During Reaction Sintering and Liquid Phase Sintering
| British Library Conference Proceedings | 1993
| European Patent Office | 2023