（Hot press sintered AlN produced by Wintrustek）

Hot press sintering is the process of sintering ceramic under a specific pressure. It allows for the simultaneous heating and pressurized shaping of ceramics to produce materials with fine grain, high relative density, and strong mechanical properties.

The hot pressing process is particularly well suited to the production of ultra-high temperature ceramics (UHTCs), which are materials that do not ordinarily sinter to high densities in standard sintering operations.

Over the years, researchers have experimented with several procedures for sintering AlN and increasing its characteristics. AlN exhibits covalent bonding, hence, in order to obtain full density, it must be sintered at a temperature higher than 1800 ℃. Hot pressing is therefore used in the industry to sinter AlN without sintering additives.

Hot-press sintering is a commonly employed technique for enhancing the strength of AlN ceramics due to these specific features. First, pressure-assisted densification is carried out in conjunction with the hot-press sintering process to aid in the creation of fully densified AlN ceramics. External pressure gives densification an extra push force in comparison to pressureless sintering, lowering the sintering temperature by roughly 50-150 ℃ and limiting the foramtion of large grains.

Hot-pressed aluminum nitride ceramic is utilized in semiconductor industry that requires strong electrical resistance, high flexural strength as well as excellent thermal conductivity.