Iron-based Catalyst Synthesis Of Diamond With Boron Organizational Structure And Performance Analysis

The manufacture and application of diamond is one notable creation of human being. Diamond not only has excellent performances such as high rigidity, anti-erosion and wearability, but also has outstanding characters which refer to optics, acoustics and calorifics. When adulterated with boron atoms the electric resistance of diamond will drop and it will become a kind of semiconductor. With the developing industry and technology, boron-doped diamond displays a huge application foreground in every field, and shows its important function in modern science and economy. So the research on some new type of diamond single-crystal with high quality has significant practical meaning.In this article, boron-doped diamond single crystals were synthesized at high temperature and high pressure (HTHP) by using B4C added in the Fe-based catalyst and using graphite as raw materials. Microstructures of boron-doped diamond were investigated by modern analysis methods, and the properties , such as static intensity, impact toughness and oxidation temperature, were tested so as to analysis the property differences between the boron-doped diamond and a normal diamond relatively.Optical microscope and field emission scanning electron microscope (FESEM) were used to study nucleation density, grain size , crystal shape and color of single crystals, and surface configuration. The results of the tests indicate that nucleation density become bigger due to boron adulteration, while the color becomes opaque black. By comparing the crystal shape of diamond, it can be found that catalysts affect crystal shape under the same conditions including raw materials, temperature and pressure. Boron-doped diamond mostly be in the form of octahedron, while normal diamond mostly in the form of hex -octahedron owing to the increase growth rate of (111) plane as result of boron atoms. Normal diamond grow well. However there are many kinds of pattern on the surfaces of boron-doped diamond, such as sawtooth step, helix step, ladder-like growth step and grain-like pattern. XRD and Raman results indicate that a normal diamond and the boron-doped diamond are all cubic structured, and rime well. Owing to boron adulteration, the Raman apex displacement gradually...