Research:

He has been engaged in the research of High Performance Ceramics, including the structural design, calculation and advanced fabrication. Developed and improved the research directions of high pressure resistant SiC ceramics and high performance B₄C ceramics. 

He has presided and participated in a number of national and local scientific research projects, including the National Natural Science Foundation, the key R & D plan of the Ministry of science and technology, the key deployment of the Chinese Academy of Sciences, the Shanghai Natural Science Foundation, the youth innovation promotion association of the Chinese Academy of Sciences and other projects. Published more than 30 SCI papers at J. eur Ceram. Soc.， J. Am. Ceram. Soc. And other journals and applied for 15 Chinese invention patents.

1、Development of high performance pressureless SiC ceramics

The research on the preparation of low sintering additives and fine crystallization pressureless sintered SiC ceramics was focused, the problems of abnormal grain growth and difficult dispersion of sintering additives were solved, the densification mechanism of SiC ceramics was clarified, and the preparation technology of high-performance pressureless sintered SiC was broken through. On this basis, the key technologies for the preparation and processing of large-size SiC ceramic components have been broken through and applied to special harsh scenarios.

Fig. 1 microstructure changes of SiC ceramics before and after development

2、Study on SiC composites with high toughness and sound velocity 

The idea of using the second phase of graphene with high strength and high sound velocity was put forward. The dispersion problem of graphene /sic composites was solved by using the characteristics of reduction after casting, and the key technology for the preparation of high-performance graphene /sic composites was broken through.

Fig.2 Graphene /SiC composite process

3、New multiphase B₄C protective ceramics

By optimizing the sintering parameters, pure B₄C ceramics with excellent properties were prepared, and its mechanism was analyzed. On this basis, the multiphase design is carried out to improve the fracture toughness of B₄C while ensuring its high hardness. That is, the fracture toughness is improved by the introduction of titanium borate (TiB₂) and silicon carbide (SiC). The microstructure analysis shows that the grain refinement caused by the pinning effect of the second phase particles and the crack deflection at the weak interface due to the difference of thermal expansion coefficient of each phase are the main reasons for toughening. At the same time, the formation of some special structures, such as core-shell structure, also plays a positive role. The fracture toughness of B₄C -TiB₂-sic composite ceramics is up to 5 MPa·m^1/2, the bending strength is up to 700 MPa, and the compressive strength is up to 3800 MPa. Compared with pure B₄C ceramics, its mechanical properties have been greatly improved.

Fig.3 Grain distribution and crack propagation of B₄C-TiB₂-SiC multiphase ceramics

Publications:

1. Liu, Yingying, Huang Yihua*, et al，Ceramics International, 2021, 47, 21915
2. Liu, Yingying, Huang Yihua*, et al，Materials , 2021, 14:1100.
3. Liu, Yingying, Huang Yihua*, et al，Materials Today Communications, 2020, 23: 100875
4. Liu, Yingying, Huang Yihua*, et al，Ceramics International, 2020, 46: 3793
5. Huang Yihua*, Jiang Dongliang, et al，Journal of the European Ceramic Society, 2018, 38: 4329
6. Huang Yihua*, Jiang Dongliang, et al, Journal of Rare Earths, 2014, 32: 416
7. Huang Yihua*, Jiang Dongliang, et al，Journal of Rare Earths，2013, 31: 153
8. 黄毅华, 江东亮, et al, 无机材料学报, 2018, 33: 1147
9. 黄毅华^*，江东亮, et al，物理学报，2017，66: 017501

Details:

http://sourcedb.sic.cas.cn/zw/rck/201607/t20160705_4635087.html