Explanation

It refers to the phenomenon that the final performance of metal and ceramic powders deteriorates due to excessively high sintering temperature or excessively long sintering time during the sintering process. In addition to being easy to deform, the size of the product does not meet the requirements, overheating structure, coarse grains, grain boundary oxidation and other phenomena will also occur. So sintering should strictly control sintering temperature and sintering time; It refers to the phenomenon of grain boundary hardening or partial melting of metals and alloy during hot working and heat treatment because the temperature is significantly higher than its solidus temperature. oversintering/over- burning first occurs at the grain boundary because the grain boundary energy is higher than that in the grain, which is easy to harden and melt. oversintering/over- burning seriously deteriorates the properties of metals and alloy, and cannot be recovered by hot working, so it can only be scrapped.

Classification