The influence of many factors, such as the size and arrangement of hot filaments, the temperature field of substrate and the distribution of small diamond abrasive particles on the growth rate and quality of homoepitaxial single crystal diamonds were analyzed.

High power transverse flow CO2 laser was used to scan the brazing alloy and diamond grits.

In this thesis, CO_2 laser sintering experiments of bronze-Ti and bronze-Co-Ni powder with diamond grits have been done, aiming for exploring the new technique of manufacturing peculiar-shaped diamond tools and new synthetic material.

Compressive strength and the surface form and structure of the uncoated and coated diamond particles are measured and analyzed by a compressive strength meter and a metallograph, respectively.

Quality control technique of the artificial diamond particles also attracts many people s interests.

Study on glass scratching with single diamond grit tool;

Optics microscope and X-ray diffraction(XRD) were used to investigate the solvent metal covering on diamond single crystal synthesized by iron-based alloy catalyst and graphite under different synthesized technics at high temperature and high pressure(HTHP).

Scanning electron microscope(SEM) and Energy Dispersive Spectroscope(EDS) were used to investigate the effects of procedure parameters on the structures and composition of the metallic film covering on diamond single crystal from a graphite-Ni70Mn25Co5 system under high temperature and high pressure(HTHP).

The development of study on synthesizing diamond single crystal,thin film and nanocrystal with un-graphite materials is summarized.