On June 18, 2020, the high-performance SiC ceramic fiber developed by China's leading silicon carbide ceramic material manufacturer NBZX Ceramic Technology Group was officially mass-produced, and continuous fiber products were successfully put into production. The first batch of products has excellent performance through on-site sampling and testing. The average fiber diameter is 12 μm, the room temperature elastic modulus is 280 GPa, and the average tensile strength is 3.3 GPa, which is higher than the mechanical strength of Japanese Hi-Nicalon second and third generation fibers (2.8~3.0 GPa).
The new ceramic fiber through the in situ introduction of higher modulus and higher melting point ZrC/ZrB2 grain boundary strengthened nanophase, so that the high temperature creep resistance and oxidation resistance of SiC fiber are also improved. At the same time, the introduction of Ti/Zr/Hf/B10/B11 and other elements can also give SiC fibers adjustable resistivity and neutron absorption cross-section and other properties, which greatly expands the application field of SiC ceramic fibers.
Continuous SiC ceramic fiber, as a special high temperature resistant material, has the advantages of high strength, light weight, high melting point, strong resistance to oxidation and neutron radiation, etc. It is widely used in aviation, aerospace, nuclear energy, glass, electronics and other industries .
The SiC ceramic fiber developed by the new principle this time has my country's completely independent intellectual property rights, breaking the foreign monopoly.
Researcher Zhang Weigang, Technical Director of NBZX, has led the team to work on this research for many years. In 2015, a new chemical reaction process (Sci. Reaction mechanism and reaction kinetics (RSC Adv. 2016, 6, 21048). The newly discovered reaction process catalyzes the coordination polymerization of tautomer silicocarbene by transition metal, which realizes the one-step synthesis of linear polycarbosilane polymer containing Ti/Zr/Hf metal, breaking the Kumada-Yajima rearrangement reaction two The monopoly technology of polycarbosilane synthesis in one step also provides the possibility of developing new SiC composite ceramic fibers. The research team used the synthesized linear polymeric zirconium carbosilane (PZCS) as an organic precursor to develop SiC-ZrC, SiC-ZrB2 multiphase ceramic fibers, which have successively overcome porous melt spinning, electron beam crosslinking, and drawing A series of technical problems, such as ceramization, persisted on the basis of the initial progress, and finally developed a high-performance SiC composite ceramic fiber and zirconium doped modified SiC ceramic fiber new material (Ceram. Int. 2016,42,9299 ; Materials 2020,13,2142).
The research team has obtained two core patent authorizations in November 2019, "Polymetallocarbosilane and its preparation method and application (ZL201410398745.8)" and "Multiphase ceramic fiber and its preparation method (ZL201410493930.5)". The high-tech industrial park carries out process amplification and industrial production of precursors and ceramic fibers.
