Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The invention relates to a preparation method of doped silicon nitride powder. The preparation method comprises the following steps: proportioning carbon black, a dispersing agent and water according to a certain mass ratio, and carrying out high-speed dispersion by high-energy ball milling to obtain black slurry; taking a proper amount of the black slurry, mixing the black slurry with silicon oxide, fumed silica, nitrate, a dispersing agent and water according to a certain weight percentage, performing high-speed dispersion, and performing spray drying to obtain powder with good fluidity; and introducing a mixed gas of nitrogen and hydrogen to carry out a nitridation reaction so as to obtain a sinter, and carrying out decarburization treatment so as to obtain the doped asilicon nitride powder. The doped silicon nitride powder can be directly used for sintering ceramic forming, complete nitridation of silicon powder at a low temperature and within a short heat preservation time is achieved through a high-energy ball milling method assisted with a carbothermic reduction method, no inorganic sintering aid needs to be added in the subsequent ceramic forming process of the doped silicon nitride powder, the process is simple, the raw materials are cheap, the synthesis temperatureis low and the production cost is low.
本发明涉及一种掺杂氮化硅粉体的制备方法，将碳黑、分散剂和水按照一定质量比例配料，通过高能球磨进行高速分散，得到黑色浆料；取适量所述黑色浆料，按照一定重量百分比与氧化硅、气相二氧化硅、硝酸盐、分散剂、水混合，高速分散后经过喷雾干燥，得到流动性好的粉体；再通入氮气和氢气的混合气体进行氮化反应，得到烧结物后进行脱碳处理，得到掺杂a‑氮化硅粉体。本发明的掺杂氮化硅粉体可直接用于烧结成瓷，以高能球磨法辅助碳热还原法，实现硅粉在较低温度下和较短保温时间内的完全氮化，掺杂氮化硅粉体在后续成瓷过程中，无需外加无机烧结助剂，工艺简单、原料价廉、合成温度低和生产成本低。
The invention relates to a preparation method of doped silicon nitride powder. The preparation method comprises the following steps: proportioning carbon black, a dispersing agent and water according to a certain mass ratio, and carrying out high-speed dispersion by high-energy ball milling to obtain black slurry; taking a proper amount of the black slurry, mixing the black slurry with silicon oxide, fumed silica, nitrate, a dispersing agent and water according to a certain weight percentage, performing high-speed dispersion, and performing spray drying to obtain powder with good fluidity; and introducing a mixed gas of nitrogen and hydrogen to carry out a nitridation reaction so as to obtain a sinter, and carrying out decarburization treatment so as to obtain the doped asilicon nitride powder. The doped silicon nitride powder can be directly used for sintering ceramic forming, complete nitridation of silicon powder at a low temperature and within a short heat preservation time is achieved through a high-energy ball milling method assisted with a carbothermic reduction method, no inorganic sintering aid needs to be added in the subsequent ceramic forming process of the doped silicon nitride powder, the process is simple, the raw materials are cheap, the synthesis temperatureis low and the production cost is low.
本发明涉及一种掺杂氮化硅粉体的制备方法，将碳黑、分散剂和水按照一定质量比例配料，通过高能球磨进行高速分散，得到黑色浆料；取适量所述黑色浆料，按照一定重量百分比与氧化硅、气相二氧化硅、硝酸盐、分散剂、水混合，高速分散后经过喷雾干燥，得到流动性好的粉体；再通入氮气和氢气的混合气体进行氮化反应，得到烧结物后进行脱碳处理，得到掺杂a‑氮化硅粉体。本发明的掺杂氮化硅粉体可直接用于烧结成瓷，以高能球磨法辅助碳热还原法，实现硅粉在较低温度下和较短保温时间内的完全氮化，掺杂氮化硅粉体在后续成瓷过程中，无需外加无机烧结助剂，工艺简单、原料价廉、合成温度低和生产成本低。
Preparation method of doped silicon nitride powder
一种掺杂氮化硅粉体的制备方法
30.04.2021
Patent
Elektronische Ressource
Chinesisch
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