A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The invention relates to silicon nitride ceramic powder and a preparation process thereof. According to the preparation process in the invention, silicon nitride powder and high-conductivity ceramic are prepared under the action of water gas and a catalyst. The silicon nitride ceramic powder is prepared from the following raw materials in percentage by weight: 6%-11% of nanometer fumed silica, 80%-89% of white carbon black, 1%-3% of a dispersing agent and 4%-6% of oxide. According to the silicon nitride ceramic powder, metal oxynitride serves as a sintering aid, so low-temperature rapid nitriding can be achieved, a later acid pickling process can be omitted by adding the metal oxynitride in advance, and an operation process is simplified; rapid heat dissipation can be realized by using a rotary furnace; water gas is cheap and easily available and has good reducibility; and a nitrogen-argon gas mixture is used for replacing nitrogen to prepare silicon nitride powder, so a reaction speedcan be greatly increased, and the technical problems that the silicon nitride ceramic is not high in compactness and low in heat conductivity coefficient caused by a long preparation period, a complex process and low purity of the prepared silicon nitride ceramic powder in the prior art are solved.
本发明涉及一种氮化硅陶瓷粉体及其制备工艺，通过水煤气和催化剂作用下制备氮化硅粉体、高导热陶瓷的制备工艺,氮化硅陶瓷粉体由以下重量配比的原料制成：纳米气相二氧化硅6%～11%，白炭黑80%～89%，分散剂1%～3%，氧化物4%～6%，氮化硅陶瓷粉体的制备工艺。本发明的氮化硅陶瓷粉体以金属氧氮化物作为烧结助剂，可实现低温快速氮化，同时提前加入可以免除后期酸洗过程，简化操作工艺；旋转炉的使用可以实现快速散热；水煤气便宜易得，还原性好；将氮气和氩气混合气体代替氮气制取氮化硅粉，可大大加快反应速度，解决了现有技术中制备周期长、工艺复杂且制备的氮化硅陶瓷粉体纯度不高，进而导致的氮化硅陶瓷致密性不高，导热系数低的技术问题。
The invention relates to silicon nitride ceramic powder and a preparation process thereof. According to the preparation process in the invention, silicon nitride powder and high-conductivity ceramic are prepared under the action of water gas and a catalyst. The silicon nitride ceramic powder is prepared from the following raw materials in percentage by weight: 6%-11% of nanometer fumed silica, 80%-89% of white carbon black, 1%-3% of a dispersing agent and 4%-6% of oxide. According to the silicon nitride ceramic powder, metal oxynitride serves as a sintering aid, so low-temperature rapid nitriding can be achieved, a later acid pickling process can be omitted by adding the metal oxynitride in advance, and an operation process is simplified; rapid heat dissipation can be realized by using a rotary furnace; water gas is cheap and easily available and has good reducibility; and a nitrogen-argon gas mixture is used for replacing nitrogen to prepare silicon nitride powder, so a reaction speedcan be greatly increased, and the technical problems that the silicon nitride ceramic is not high in compactness and low in heat conductivity coefficient caused by a long preparation period, a complex process and low purity of the prepared silicon nitride ceramic powder in the prior art are solved.
本发明涉及一种氮化硅陶瓷粉体及其制备工艺，通过水煤气和催化剂作用下制备氮化硅粉体、高导热陶瓷的制备工艺,氮化硅陶瓷粉体由以下重量配比的原料制成：纳米气相二氧化硅6%～11%，白炭黑80%～89%，分散剂1%～3%，氧化物4%～6%，氮化硅陶瓷粉体的制备工艺。本发明的氮化硅陶瓷粉体以金属氧氮化物作为烧结助剂，可实现低温快速氮化，同时提前加入可以免除后期酸洗过程，简化操作工艺；旋转炉的使用可以实现快速散热；水煤气便宜易得，还原性好；将氮气和氩气混合气体代替氮气制取氮化硅粉，可大大加快反应速度，解决了现有技术中制备周期长、工艺复杂且制备的氮化硅陶瓷粉体纯度不高，进而导致的氮化硅陶瓷致密性不高，导热系数低的技术问题。
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