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Vacuum Heat Treatment Furnace

Vacuum Sintering Furnace

Vacuum Brazing Furnace

Application of vacuum sintering equipment

Sintering furnace plays a very important role in the preparation process of advanced ceramics. Sintering is a key link in the preparation process of advanced ceramics. Its function is to heat treat the formed ceramic green body at high temperature, promote the bonding and densification between ceramic particles, and finally obtain ceramic materials with excellent performance. It not only affects the structure and performance of ceramic materials, but also affects the efficiency and environmental protection of the entire manufacturing process. In order to obtain ceramic materials with excellent performance, it is necessary to select the appropriate sintering furnace type and parameters, and perform reasonable operation and maintenance.

Vacuum sintering furnace: sintering under vacuum state, suitable for sintering of high-temperature and high-purity ceramic materials. Hot pressing sintering is carried out in a certain high vacuum environment. The sintered materials will react anaerobicly or chemically with oxygen, and must be hot pressed sintered in a vacuum environment.

Vacuum sintering process：

1.In the early stage of vacuum sintering, the powder forms a porous body with a certain shape and mechanical strength under the action of external pressure. With the increase of sintering temperature and time, the bonding and rearrangement of particles begin to occur. At this time, the particles are close to each other due to rearrangement, the large gaps gradually disappear, and the volume of the pores decreases rapidly, but the particles are still mainly point-contacted, and the total surface area does not decrease.

2.In the middle stage of vacuum sintering, the point contact between particles gradually expands to surface contact, the grain boundary area increases, but the pores are still connected. At this stage, the grain boundary moves more easily. Driven by the reduction of surface energy, the relative density increases rapidly. The powder particles are rearranged, and the local fragmentation or plastic flow mass transfer caused by grain boundary sliding causes the material to fill the pores through different diffusion pathways. The volume of the pores decreases, and grain boundaries begin to form between fine particles. The area of the grain boundaries continues to expand, making the green body denser.

3.In the late stage of vacuum sintering, the grain boundaries further expand, the pores gradually decrease and deform, and the pores gradually migrate to the grain boundaries and disappear. The density of the sintered body increases, and the green body can reach about 95% of the theoretical density.

High purity ceramic compounds：

Working steps and vacuum sintering process:

① Loading: Load ceramic powder into the furnace.

② Vacuuming: The furnace is evacuated into a vacuum state through the vacuum system to remove gases and impurities in the furnace.

③ Heating: The temperature in the furnace is raised to the set temperature through the heater to melt the ceramic powder.

④ Pressurization: Under high temperature, the ceramic powder is pressed by the pressurization system to fuse it into a dense solid structure.

⑤ Cooling: After the vacuum sintering is completed, the furnace is cooled by the cooling system to gradually cool the ceramic material to room temperature.

During the whole process, the hot pressing sintering furnace can effectively control the quality and performance of ceramic products by controlling parameters such as temperature, pressure and atmosphere.