Regarding the research of a variety of micro-nano-structured boron nitride materials and large-scale synthesis methods, micro-nano boron nitride materials with different structures and functions have been obtained for different fields, and the mechanics and electrics of these materials have been systematically discussed. , Optics and other properties, lay the theoretical and experimental foundation for its application in nanoelectronics, composite toughening, energy and other fields. Monomer boron

(1) Pilot development of green, large-scale synthesis and commercialization equipment for spherical BN nanoparticles

Using boric acid ester as raw material, spherical BN nanoparticles are prepared by CVD method and accurate synthesis process control, and large-scale synthesis of BN nanospheres with a diameter of 30-50 nm is realized. This CVD method is not simple in process, and has side effects. The products are alcohols and ethers that can be collected and are environmentally friendly. At present, the center has realized the pilot production of spherical BN nano-particles, which can produce more than 5 kg of BN nano-spheres per day, laying a foundation for industrial application. The industrialization promotion of related products has reached a preliminary agreement with the enterprise. Using this spherical BN as a precursor, a cubic structure BN with nano twin structure was prepared by high temperature and high pressure reaction without adding a catalyst. The hardness of this material is not much higher than that of the common commercial micron cubic BN, and It also exceeds the ideal hardness of diamond, while also exhibiting fracture toughness and high temperature oxidation resistance. This research work will undoubtedly open up broad prospects for the application of tools and drills in the future.

(2) Research on the controllable synthesis and performance of BN nanotubes

Invented the "movable catalyst in-situ CVD reaction method", which realized the large-scale preparation of boron nitride nanotubes. The laboratory growth equipment established according to this method can produce 10 g of BN nanotubes with a purity greater than 95% per day. At the same time, BN nanotubes with a fully defective structure were obtained internationally (now commonly known as collapsed BN nanotubes). In recent years, we have also synthesized ultra-fine BN nanotubes with a tube diameter of less than 10 nm using Li2O as a catalyst; synthesized BN microtubes with a tube wall thickness of about 50 nm using Li2CO3 as a catalyst. For mixed BN microtubes, the field emission performance of doped BCN tubes has been greatly improved compared to pure BN microtubes.

In-depth research on the electronic transport, hydrogen storage, heat conduction, field emission, optical and mechanical properties of the BN micro/nano structure. The chemical vapor deposition method is used to synthesize F-doped BN nanotubes. The conductivity of this F-doped BN nanotubes can be adjusted by the doping amount. The F doping of less than 5% can make the BN nanotubes The conductance is increased by more than 3 orders of magnitude. We also found that the collapsed BN nanotubes with a fully defect structure have a hydrogen adsorption value of 4.2 wt% at 10 MPa and room temperature. Other work on the mechanics, thermal, field emission, photocatalysis, functionalization and composite materials of BN nanomaterials has also been systematically studied.

The "removable catalyst in-situ CVD method" was adopted to realize the large-scale preparation of BNNT