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Low-oxygen-content silicon nitride powder and aluminothermic reduction method and application thereof
The invention provides low-oxygen-content silicon nitride powder and an aluminothermic reduction method and application thereof, and belongs to the technical field of silicon nitride ceramics. The aluminothermic reduction method of the low-oxygen-content silicon nitride powder, provided by the invention, comprises the following steps: ball-milling and mixing silicon nitride powder and aluminum powder to obtain mixed powder; the mixed powder is subjected to aluminothermic reduction and then mixed with an acid solution, the low-oxygen-content silicon nitride powder is obtained, the aluminothermic reduction temperature ranges from 600 DEG C to 800 DEG C, and the heat preservation time of aluminothermic reduction ranges from 3 h to 5 h. Aluminum is added into the silicon nitride powder to serve as a reducing agent, silicon dioxide is removed through an aluminothermic reduction method, the oxygen content in the silicon nitride powder is reduced, the needed reaction temperature is low, and the reaction conditions are milder. The result of the embodiment shows that the oxygen content in the obtained silicon nitride powder is smaller than or equal to 0.93 wt.%, and the thermal conductivity is larger than 75 W/m.K after the silicon nitride powder is prepared into silicon nitride ceramic.
本发明提供了一种低氧含量氮化硅粉末及其铝热还原方法和应用，属于氮化硅陶瓷技术领域。本发明提供的低氧含量氮化硅粉末的铝热还原方法，包括以下步骤：将氮化硅粉末和铝粉进行球磨混合，得到混合粉末；将混合粉末进行铝热还原，然后和酸性溶液混合，得到低氧含量氮化硅粉末，铝热还原的温度为600～800℃，铝热还原的保温时间为3～5h。本发明在氮化硅粉末中添加铝作为还原剂，利用铝热还原方法去除二氧化硅，降低氮化硅粉末中的氧含量，所需的反应温度低，反应条件更加温和。实施例的结果显示，本发明得到的氮化硅粉末中氧含量≤0.93wt.％，制备成氮化硅陶瓷后热导率＞75W/m·K。
Low-oxygen-content silicon nitride powder and aluminothermic reduction method and application thereof
The invention provides low-oxygen-content silicon nitride powder and an aluminothermic reduction method and application thereof, and belongs to the technical field of silicon nitride ceramics. The aluminothermic reduction method of the low-oxygen-content silicon nitride powder, provided by the invention, comprises the following steps: ball-milling and mixing silicon nitride powder and aluminum powder to obtain mixed powder; the mixed powder is subjected to aluminothermic reduction and then mixed with an acid solution, the low-oxygen-content silicon nitride powder is obtained, the aluminothermic reduction temperature ranges from 600 DEG C to 800 DEG C, and the heat preservation time of aluminothermic reduction ranges from 3 h to 5 h. Aluminum is added into the silicon nitride powder to serve as a reducing agent, silicon dioxide is removed through an aluminothermic reduction method, the oxygen content in the silicon nitride powder is reduced, the needed reaction temperature is low, and the reaction conditions are milder. The result of the embodiment shows that the oxygen content in the obtained silicon nitride powder is smaller than or equal to 0.93 wt.%, and the thermal conductivity is larger than 75 W/m.K after the silicon nitride powder is prepared into silicon nitride ceramic.
本发明提供了一种低氧含量氮化硅粉末及其铝热还原方法和应用，属于氮化硅陶瓷技术领域。本发明提供的低氧含量氮化硅粉末的铝热还原方法，包括以下步骤：将氮化硅粉末和铝粉进行球磨混合，得到混合粉末；将混合粉末进行铝热还原，然后和酸性溶液混合，得到低氧含量氮化硅粉末，铝热还原的温度为600～800℃，铝热还原的保温时间为3～5h。本发明在氮化硅粉末中添加铝作为还原剂，利用铝热还原方法去除二氧化硅，降低氮化硅粉末中的氧含量，所需的反应温度低，反应条件更加温和。实施例的结果显示，本发明得到的氮化硅粉末中氧含量≤0.93wt.％，制备成氮化硅陶瓷后热导率＞75W/m·K。
Low-oxygen-content silicon nitride powder and aluminothermic reduction method and application thereof
一种低氧含量氮化硅粉末及其铝热还原方法和应用
YANG PING (author) / GENG RENCONG (author) / JIA WENLEI (author) / ZHU WUXUN (author) / LI MINGWEI (author) / QI WENHAN (author) / ZHOU JU (author) / ZENG YIMING (author) / HAN JIAO (author) / LI SHIQI (author)
2024-04-12
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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