The HNLG ceramic R&D team has successfully prepared a high entropy porous boride ceramic material that combines super mechanical strength and high insulation through multi-scale structural design. The material can withstand up to High temperature of 2000° C.
Porous ceramic materials with excellent mechanical strength and thermal insulation properties have always been the pursuit goal of scientists.
However, these two attributes are mutually restrictive to a certain extent, and it is often difficult to achieve both for traditional porous ceramics. If the relative density of porous ceramics is simply reduced, the thermal insulation performance of the material can be significantly improved, but this often leads to a significant decrease in the mechanical strength of the material. Meanwhile, traditional porous ceramic materials generally have a temperature resistance of less than 1500 During high-temperature service at ° C, it often faces problems such as volume shrinkage and mechanical performance degradation, which cannot meet the increasingly stringent service requirements.
In response to the above issues, the HNLG R&D team successfully prepared a high entropy porous boride ceramic material with both super mechanical strength and high insulation through multi-scale structural design. Meanwhile, the material also displays High temperature stability at 2000 ° C.
High entropy porous ceramic materials have broad application prospects in the fields of aerospace, energy and chemical engineering.
The excellent properties of this material are attributed to the “three magic technology”: ultra-fine pores constructed at the microscopic scale, strong intergranular interface bonding at the nanoscale, and severe lattice distortion at the atomic scale:
Firstly, at the micrometer scale, the team achieved sintering within tens of seconds using ultra-high temperature rapid synthesis technology to suppress grain growth and construct uniformly distributed submicron level ultrafine pores within the material;
Secondly, at the nanoscale, strong interfacial bonding between grains is established through further solid solution reactions;
Thirdly, at the atomic scale, by introducing severe lattice distortion of 9-membered cations, the stress and mass field fluctuations inside the lattice can be enhanced, thereby enhancing the intrinsic mechanical strength of borides.