Explanation

At a sufficiently high sintering temperature, a certain amount of liquid phase appears in the sintering billet, and the sintering process is a process. Due to the formation and spreading of the liquid phase, the surface energy of the powder sintering system decreases rapidly, and the diffusion activity of the composition increases significantly, making the sintering compact fully densification or even fully densified. Because no external pressure is applied, dense sintering parts can be obtained at lower sintering temperature. Therefore, the production cost is lower than that of other high density processing sintering. It is estimated that 70% of the sintering process of powder metallurgy products is or is related to. Its main application fields are aerospace, aerospace materials (P/M titanium alloy, powder metalluygy superalloy), hardmetal (steel bond hard alloy), electrical contact components, diamond tools (diamond metal), etc. liquid phase sintering can be divided into two categories. One is sintering in which only a small amount of liquid phase occurs in a very short sintering time, which is called instantaneous. For example, when the mixed powder of sintering Fe powder and Cu powder is pressed into compact, a small amount of copper is melted and diffusion. The other is sintering in which a large amount of liquid phase exists for a long time, such as the sintering process of hardmetal and high specific gravity alloy.

Classification