Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for preparing high-thermal-conductivity silicon nitride ceramic
According to the method for preparing the high-thermal-conductivity silicon nitride ceramic provided by the invention, the silicon nitride raw material powder which is mainly an alpha phase is oxidized and refined, so that the surfaces of silicon nitride powder particles are oxidized to form silicon dioxide, the liquid phase content during silicon nitride sintering is increased, the sintering activity of the powder is improved, and meanwhile, the thermal conductivity of the silicon nitride ceramic is improved. The silicon nitride particles subjected to refinement treatment enable beta-phase seed crystals added subsequently to grow more easily, so that the sintering temperature is reduced, the addition amount of a sintering aid is reduced, and the purpose of preparing the high-thermal-conductivity silicon nitride at low cost is achieved. And adding a certain amount of beta-phase seed crystals and a sintering aid into the powder, mixing and molding to form a ceramic biscuit, and carrying out air pressure sintering to obtain the high-thermal-conductivity silicon nitride ceramic material. The thermal conductivity of the high-thermal-conductivity silicon nitride ceramic material prepared by the method can reach more than 80Wm <-1 > K <-1 >, and the bending strength can reach more than 800MPa.
本发明提出一种制备高导热氮化硅陶瓷的方法，对主要为α相的氮化硅原料粉体进行氧化和细化处理，使氮化硅粉料颗粒表面氧化形成二氧化硅，增加氮化硅烧结时的液相含量，提高了粉体的烧结活性，同时,经细化处理的氮化硅颗粒更容易使后续添加的β相籽晶长大，从而降低烧结温度、减少烧结助剂添加量，达到低成本制备高导热氮化硅的目的，过程包括首先对氮化硅原料粉体进行细化和氧化处理，再向粉料中添加一定含量的β相籽晶和烧结助剂，混料成型成陶瓷素坯后进行气压烧结，得到高导热氮化硅陶瓷材料。采用该方法制备的高导热氮化硅陶瓷材料热导率可达80W•m‑1•K‑1以上，抗弯强度可达800MPa以上。
Method for preparing high-thermal-conductivity silicon nitride ceramic
According to the method for preparing the high-thermal-conductivity silicon nitride ceramic provided by the invention, the silicon nitride raw material powder which is mainly an alpha phase is oxidized and refined, so that the surfaces of silicon nitride powder particles are oxidized to form silicon dioxide, the liquid phase content during silicon nitride sintering is increased, the sintering activity of the powder is improved, and meanwhile, the thermal conductivity of the silicon nitride ceramic is improved. The silicon nitride particles subjected to refinement treatment enable beta-phase seed crystals added subsequently to grow more easily, so that the sintering temperature is reduced, the addition amount of a sintering aid is reduced, and the purpose of preparing the high-thermal-conductivity silicon nitride at low cost is achieved. And adding a certain amount of beta-phase seed crystals and a sintering aid into the powder, mixing and molding to form a ceramic biscuit, and carrying out air pressure sintering to obtain the high-thermal-conductivity silicon nitride ceramic material. The thermal conductivity of the high-thermal-conductivity silicon nitride ceramic material prepared by the method can reach more than 80Wm <-1 > K <-1 >, and the bending strength can reach more than 800MPa.
本发明提出一种制备高导热氮化硅陶瓷的方法，对主要为α相的氮化硅原料粉体进行氧化和细化处理，使氮化硅粉料颗粒表面氧化形成二氧化硅，增加氮化硅烧结时的液相含量，提高了粉体的烧结活性，同时,经细化处理的氮化硅颗粒更容易使后续添加的β相籽晶长大，从而降低烧结温度、减少烧结助剂添加量，达到低成本制备高导热氮化硅的目的，过程包括首先对氮化硅原料粉体进行细化和氧化处理，再向粉料中添加一定含量的β相籽晶和烧结助剂，混料成型成陶瓷素坯后进行气压烧结，得到高导热氮化硅陶瓷材料。采用该方法制备的高导热氮化硅陶瓷材料热导率可达80W•m‑1•K‑1以上，抗弯强度可达800MPa以上。
Method for preparing high-thermal-conductivity silicon nitride ceramic
一种制备高导热氮化硅陶瓷的方法
QI HAI (Autor:in) / LI FENG (Autor:in) / SHEN SHILIN (Autor:in) / TIAN YUNLONG (Autor:in) / ZHANG PEIZHI (Autor:in) / GUO FANGQUAN (Autor:in)
14.03.2023
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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