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Low-temperature sintered high-thermal-conductivity silicon nitride ceramic powder, ceramic preparation method and application
The invention provides low-temperature sintered high-thermal-conductivity silicon nitride ceramic powder, a ceramic preparation method and application thereof, the ceramic powder comprises silicon nitride ceramic and a magnesium-silicon alloy composition, the mass percentage of the silicon nitride ceramic is more than 85% and less than 100%, and the mass percentage of the magnesium-silicon alloy composition is more than 0% and less than 15%. The magnesium-silicon alloy composition is adopted to replace traditional oxide sintering aids such as magnesium oxide, and liquid-phase sintering is realized at a relatively low sintering temperature by utilizing the characteristic of low melting point of the magnesium-silicon alloy. The high activity of magnesium metal is utilized, magnesium reacts with silicon oxide on the surface of silicon nitride, oxygen is removed, a fresh silicon nitride surface is exposed to participate in sintering, and the sintering activity is improved. Through sintering in a nitrogen atmosphere, the redundant magnesium-silicon sintering aid reacts with nitrogen to form non-oxidizing substances such as silicon nitride, magnesium-silicon-nitrogen and the like, the content of oxide impurities at the grain boundary is reduced, and the heat conduction and heat transfer performance of the silicon nitride ceramic is effectively improved.
本发明提供一种低温烧结高导热氮化硅陶瓷粉体、陶瓷制备方法及其应用，该陶瓷粉体包括氮化硅陶瓷和镁硅合金组合物，其中氮化硅陶瓷的质量百分比为85％<氮化硅陶瓷<100％，镁硅合金组合物的质量百分比为0％<镁硅合金组合物<15％。采用镁硅合金组合物取代传统的氧化镁等氧化物烧结助剂，利用了镁硅合金低熔点特性，在较低的烧结温度下实现了液相烧结。利用金属镁的高活性，镁与氮化硅表面的氧化硅反应，夺去氧，露出新鲜的氮化硅表面参与烧结，提升烧结活性。通过在氮气气氛烧结，多余的镁硅烧结助剂会与氮气反应形成氮化硅、镁硅氮等物质非氧化物质，降低晶界处的氧化物杂质含量，有效提升氮化硅陶瓷的热导传热性能。
Low-temperature sintered high-thermal-conductivity silicon nitride ceramic powder, ceramic preparation method and application
The invention provides low-temperature sintered high-thermal-conductivity silicon nitride ceramic powder, a ceramic preparation method and application thereof, the ceramic powder comprises silicon nitride ceramic and a magnesium-silicon alloy composition, the mass percentage of the silicon nitride ceramic is more than 85% and less than 100%, and the mass percentage of the magnesium-silicon alloy composition is more than 0% and less than 15%. The magnesium-silicon alloy composition is adopted to replace traditional oxide sintering aids such as magnesium oxide, and liquid-phase sintering is realized at a relatively low sintering temperature by utilizing the characteristic of low melting point of the magnesium-silicon alloy. The high activity of magnesium metal is utilized, magnesium reacts with silicon oxide on the surface of silicon nitride, oxygen is removed, a fresh silicon nitride surface is exposed to participate in sintering, and the sintering activity is improved. Through sintering in a nitrogen atmosphere, the redundant magnesium-silicon sintering aid reacts with nitrogen to form non-oxidizing substances such as silicon nitride, magnesium-silicon-nitrogen and the like, the content of oxide impurities at the grain boundary is reduced, and the heat conduction and heat transfer performance of the silicon nitride ceramic is effectively improved.
本发明提供一种低温烧结高导热氮化硅陶瓷粉体、陶瓷制备方法及其应用，该陶瓷粉体包括氮化硅陶瓷和镁硅合金组合物，其中氮化硅陶瓷的质量百分比为85％<氮化硅陶瓷<100％，镁硅合金组合物的质量百分比为0％<镁硅合金组合物<15％。采用镁硅合金组合物取代传统的氧化镁等氧化物烧结助剂，利用了镁硅合金低熔点特性，在较低的烧结温度下实现了液相烧结。利用金属镁的高活性，镁与氮化硅表面的氧化硅反应，夺去氧，露出新鲜的氮化硅表面参与烧结，提升烧结活性。通过在氮气气氛烧结，多余的镁硅烧结助剂会与氮气反应形成氮化硅、镁硅氮等物质非氧化物质，降低晶界处的氧化物杂质含量，有效提升氮化硅陶瓷的热导传热性能。
Low-temperature sintered high-thermal-conductivity silicon nitride ceramic powder, ceramic preparation method and application
低温烧结高导热氮化硅陶瓷粉体、陶瓷制备方法及应用
ZHOU TAO (author) / LUO WENBO (author) / WEN BING (author) / ZHAO LIHONG (author)
2021-08-06
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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