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Method for preparing high-thermal-conductivity silicon nitride ceramic through hot pressed sintering
The invention belongs to the field of ceramic preparation, and particularly relates to a method for preparing high-thermal-conductivity silicon nitride ceramic through hot pressed sintering. The method comprises the following steps: uniformly mixing silicon nitride powder and a sintering aid according to a certain proportion, and firstly, pretreating the mixed powder under the conditions of low temperature, normal pressure and nitrogen introduction; then performing grinding and sieving; and performing high-temperature sintering in a hot pressing furnace. The oxygen content of the pretreated powder is obviously reduced, and the thermal conductivity of the silicon nitride ceramic prepared through hot pressing is larger than 80 W/m.K in the pressure direction and larger than 120 W/m.K in the direction perpendicular to the pressure direction. The treated powder is low in oxygen content, a sintered sample not only has high density, but also is uniform in second phase distribution and low in content, and the high-thermal-conductivity silicon nitride ceramic can be obtained in one step. The method can effectively reduce the content of the second phase in the ceramic and reduce the influence of oxygen on the heat-conducting property of the ceramic, and the preparation process is simple and efficient. A solution is provided for preparing ceramic with excellent heat-conducting property from the high-oxygen-content silicon nitride powder.
本发明属于陶瓷制备领域，具体涉及一种热压烧结制备高导热氮化硅陶瓷的方法。该方法是将氮化硅粉体与烧结助剂按一定比例混合均匀，首先将混合后的粉体在低温、常压、通氮气条件下进行预处理；再经过研磨、过筛；随后在热压炉中进行高温烧结。经过预处理的粉体氧含量有明显降低，热压制备的氮化硅陶瓷热导率沿压力方向大于80W/m·K，垂直于压力方向大于120W/m·K。经过处理后的粉体氧含量低，烧结样品不仅具有高致密度，第二相分布均匀且含量少，可一步得到高导热氮化硅陶瓷。该方法可有效减少陶瓷中第二相含量，降低氧对陶瓷导热性能的影响，制备工艺简单、高效。为高氧含量氮化硅粉体制备导热性能优异的陶瓷提供方向。
Method for preparing high-thermal-conductivity silicon nitride ceramic through hot pressed sintering
The invention belongs to the field of ceramic preparation, and particularly relates to a method for preparing high-thermal-conductivity silicon nitride ceramic through hot pressed sintering. The method comprises the following steps: uniformly mixing silicon nitride powder and a sintering aid according to a certain proportion, and firstly, pretreating the mixed powder under the conditions of low temperature, normal pressure and nitrogen introduction; then performing grinding and sieving; and performing high-temperature sintering in a hot pressing furnace. The oxygen content of the pretreated powder is obviously reduced, and the thermal conductivity of the silicon nitride ceramic prepared through hot pressing is larger than 80 W/m.K in the pressure direction and larger than 120 W/m.K in the direction perpendicular to the pressure direction. The treated powder is low in oxygen content, a sintered sample not only has high density, but also is uniform in second phase distribution and low in content, and the high-thermal-conductivity silicon nitride ceramic can be obtained in one step. The method can effectively reduce the content of the second phase in the ceramic and reduce the influence of oxygen on the heat-conducting property of the ceramic, and the preparation process is simple and efficient. A solution is provided for preparing ceramic with excellent heat-conducting property from the high-oxygen-content silicon nitride powder.
本发明属于陶瓷制备领域，具体涉及一种热压烧结制备高导热氮化硅陶瓷的方法。该方法是将氮化硅粉体与烧结助剂按一定比例混合均匀，首先将混合后的粉体在低温、常压、通氮气条件下进行预处理；再经过研磨、过筛；随后在热压炉中进行高温烧结。经过预处理的粉体氧含量有明显降低，热压制备的氮化硅陶瓷热导率沿压力方向大于80W/m·K，垂直于压力方向大于120W/m·K。经过处理后的粉体氧含量低，烧结样品不仅具有高致密度，第二相分布均匀且含量少，可一步得到高导热氮化硅陶瓷。该方法可有效减少陶瓷中第二相含量，降低氧对陶瓷导热性能的影响，制备工艺简单、高效。为高氧含量氮化硅粉体制备导热性能优异的陶瓷提供方向。
Method for preparing high-thermal-conductivity silicon nitride ceramic through hot pressed sintering
一种热压烧结制备高导热氮化硅陶瓷的方法
QIN MINGLI (author) / WANG YUELONG (author) / TIAN JIANJUN (author) / WU HAOYANG (author) / JIA BAORUI (author) / ZHANG ZHIRUI (author) / ZHANG LIN (author) / QU XUANHUI (author)
2021-12-03
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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