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Silicon nitride ceramic and preparation method thereof
The invention provides silicon nitride ceramic and a preparation method thereof. The method comprises the steps that raw materials are provided, the raw materials comprise first silicon nitride powder, second silicon nitride powder, a sintering aid and a dispersing agent, and the ratio of the volume average particle size Dv50 of the first silicon nitride powder to the volume average particle size Dv50 of the second silicon nitride powder is (5-100): 1; mixing the raw materials, carrying out ball milling, and then drying to obtain a to-be-sintered material; the to-be-sintered material is sintered, the sintering pressure is 25-300 MPa, the pressure rising mode is vibration type pressure rising, the sintering temperature is 1400-1500 DEG C, the heat preservation time is 20-60 min, and the silicon nitride ceramic is obtained after cooling. Therefore, by adjusting the particle size of the silicon nitride powder in the raw materials and cooperatively using a vibration type boosting mode, the second silicon nitride powder is promoted to be filled into the gaps among the first silicon nitride powder particles, and the densification of the silicon nitride ceramic is realized simply through particle rearrangement, so that the temperature and the pressure required by sintering are reduced, and the sintering efficiency is improved. The time required by sintering is shortened, and the preparation cost of the silicon nitride ceramic is greatly reduced.
本发明提供了氮化硅陶瓷及其制备方法。该方法包括：提供原料，原料包括第一氮化硅粉体、第二氮化硅粉体、烧结助剂和分散剂，第一氮化硅粉体和第二氮化硅粉体的体积平均粒径Dv50的比例为(5‑100):1；将原料混合后进行球磨，然后进行干燥，得到待烧料；将待烧料进行烧结，烧结压力为25MPa‑300MPa，升压方式为振动式升压，烧结温度为1400℃‑1500℃，保温时间为20min‑60min，冷却后得到氮化硅陶瓷。由此，通过调整原料中氮化硅粉体的粒径并配合使用振动式升压的方式，促使第二氮化硅粉体填充到第一氮化硅粉体颗粒之间的间隙，单纯通过颗粒重排实现了氮化硅陶瓷的致密化，从而降低了烧结所需的温度和压力，缩短了烧结所需的时间，大大降低了氮化硅陶瓷的制备成本。
Silicon nitride ceramic and preparation method thereof
The invention provides silicon nitride ceramic and a preparation method thereof. The method comprises the steps that raw materials are provided, the raw materials comprise first silicon nitride powder, second silicon nitride powder, a sintering aid and a dispersing agent, and the ratio of the volume average particle size Dv50 of the first silicon nitride powder to the volume average particle size Dv50 of the second silicon nitride powder is (5-100): 1; mixing the raw materials, carrying out ball milling, and then drying to obtain a to-be-sintered material; the to-be-sintered material is sintered, the sintering pressure is 25-300 MPa, the pressure rising mode is vibration type pressure rising, the sintering temperature is 1400-1500 DEG C, the heat preservation time is 20-60 min, and the silicon nitride ceramic is obtained after cooling. Therefore, by adjusting the particle size of the silicon nitride powder in the raw materials and cooperatively using a vibration type boosting mode, the second silicon nitride powder is promoted to be filled into the gaps among the first silicon nitride powder particles, and the densification of the silicon nitride ceramic is realized simply through particle rearrangement, so that the temperature and the pressure required by sintering are reduced, and the sintering efficiency is improved. The time required by sintering is shortened, and the preparation cost of the silicon nitride ceramic is greatly reduced.
本发明提供了氮化硅陶瓷及其制备方法。该方法包括：提供原料，原料包括第一氮化硅粉体、第二氮化硅粉体、烧结助剂和分散剂，第一氮化硅粉体和第二氮化硅粉体的体积平均粒径Dv50的比例为(5‑100):1；将原料混合后进行球磨，然后进行干燥，得到待烧料；将待烧料进行烧结，烧结压力为25MPa‑300MPa，升压方式为振动式升压，烧结温度为1400℃‑1500℃，保温时间为20min‑60min，冷却后得到氮化硅陶瓷。由此，通过调整原料中氮化硅粉体的粒径并配合使用振动式升压的方式，促使第二氮化硅粉体填充到第一氮化硅粉体颗粒之间的间隙，单纯通过颗粒重排实现了氮化硅陶瓷的致密化，从而降低了烧结所需的温度和压力，缩短了烧结所需的时间，大大降低了氮化硅陶瓷的制备成本。
Silicon nitride ceramic and preparation method thereof
氮化硅陶瓷及其制备方法
DU SONGMO (author) / LIU GUANGHUA (author) / ZHAO SHUO (author)
2024-05-17
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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