What is the role of vacuum hot press furnace in ceramic preparation process?

What is the role of vacuum hot press furnace in ceramic preparation process?

The process of ceramic preparation includes powder preparation, molding, sintering and finishing. Among them, sintering is a technology that densifies ceramic billet at high temperature and finally forms solid materials. Sintering technology plays a crucial role in the production process of advanced ceramics. Common sintering methods include atmospheric sintering, hot pressing sintering, hot isostatic pressing sintering and microwave sintering, among which hot pressing sintering is widely used at present. Hot pressing sintering process requires special hot pressing sintering furnace. The commonly used hot pressing sintering furnace is mainly composed of heating furnace, pressure device, die and pressure measuring device.

Hot pressing sintering is the process of applying pressure to the powder which is difficult to sinter in the die and sintering at the same time. The raw material powder is loaded into a metal or high-strength graphite cavity. At the same time, the pressure is pressed to the normal sintering temperature or slightly lower. In a short time, the powder is fired into a dense, uniform, fine-grained ceramic material. The process of hot pressing sintering can be divided into constant pressure method, high temperature pressure method and segmented pressure method according to the different pressure methods. According to the sintering method, it can be divided into vacuum sintering, atmosphere sintering, continuous pressure sintering and so on.

Compared with other sintering methods, hot pressing sintering process has the following advantages: Because of the simultaneous heating and pressure, the hot pressing sintering process is in a thermoplastic state, which is conducive to the contact diffusion flow of particles and the mass transfer process, so the forming pressure is small; It can also reduce the sintering temperature and shorten the sintering time so as to resist the grain growth to obtain fine grain, high density, and has higher mechanical properties and higher mechanical properties of the products, without adding sintering additives or forming additives can produce high purity ceramic products.

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