Abstract: To further improve the quality of the diamond coatings deposited on diamond-particles-impregnated cemented carbide substrate, a pretreatment method of pre-fixing seeds is proposed. The substrate is attached with titanium powder and then seeded, and finally pre-fixed by microwave. The quality and bon...
Abstract: The effect of argon concentration on the grain size of diamond film at different pressures was studied by hot fibre chemical vapor deposition (CVD) device, and the critical value of the size transition at different pressures was analyzed. The diamond films were analyzed by SEM and Raman spectroscopy...
Abstract: Diamond film is deposited in CH4/H2 system by microwave plasma chemical vapor deposition (MPCVD). Plasma parameters are measured by emission spectrometer. The internal stress of the grown diamond film is measured by Raman spectrometer. The surface and section morphology of the grown diamond film are...
Abstract: Two kinds of pyrophyllites from South Africa and China were analyzed by scanning electron microscope energy dispersive spectroscopy (EDS) and X-ray powder diffraction (XRD). The main chemical compositions and phase compositions of pyrophyllite were obtained. The pressure of synthesis chamber was cal...
Abstract: A new assembling method was used in pure polycrystalline cubic boron nitride (PcBN) HPHT synthesis chamber. The cBN powder with particle size of 10 μm was used as the raw material. Scanning electron microscope (SEM) and X-ray diffraction (XRD) were used to analyze the microstructure and the phase of...
Abstract: Under vacuum condition of 1 030 ℃ for 20 min, W-coated diamond was heated and brazed with Ni-Cr alloy powder. X-ray diffraction (XRD) was used to analyze the phase changes of W-coated diamond before and after heating. Scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were u...
Abstract: Additive manufacturing for diamond tools is introduced into ultra-thin diamond saw blades, using the fused deposition molding sintering (FDMS). The application of selective laser sintering (SLS) and the FDMS in manufacturing ultra-thin diamond saw blades are introduced in detail. And they are compar...
Abstract: AA356 aluminum alloy has been widely used in aerospace and other fields. However, it is faced with severe tool wear in the process of micro machining and the relevant mechanism is not clear. To reveal the influence mechanism of cutting parameters on the tool wear of CVD diamond tool micro milling AA...
Abstract: To study the mechanism of SiC fiber (SiCf) reinforced SiC ceramic matrix composite (SiCf/SiC) grinding damage, a test platform was built to carry out single abrasive particle scratch tests. The scratch force was measured and the surface damage form was observed. The influence of shape of the abrasiv...
Abstract: During the ultrasonic vibration spiral grinding process, the surface topography of the grinding wheel varies complicatedly. To accurately characterize the characters of the grinding wheel surface, a power spectral density (PSD) analysis method was adopted by decomposing the microstructure of the gri...
Abstract: For 18CrNiMo7-6 carburized steel workpiece, a single factor test was designed studying the wheel speed, the workpiece speed, the feed rate and the abrasive size. X-ray residual stress analyzer and micro hardness tester are used to detect the residual stress and hardness. The results show that high-s...
Abstract: A three-layer back propagation (BP) neural network was used to establish a grinding energy consumption prediction model. 125 single-factor experiments were designed with the grinding wheel linear velocity, feed rate and grinding depth of cut as the influencing factors. 75 sets of experimental data w...
Abstract: To detect the roundness and the black core defects of sintered spherical abrasive block, a defect detection method based on machine vision was proposed. Firstly, an image acquisition system of the abrasive block was built by using single chip microcomputer, stepping motor, sampling disc, digital mic...
Abstract: Experiments of chemical mechanical polishing 316L stainless steel were conducted under acid condition, with 1, 2, 4-triazole (TAZ) or benzotriazole (BTA) as the corrosion inhibitor, to study the effect of TAZ and BTA and the mechanisms. The polished surfaces of 316L stainless steel were observed by ...
Abstract: To analyze the influence mechanism of diamond grain size change on the grinding quality of diamond material, a molecular dynamics method was used to establish the grinding model of spherical rigid diamond grain grinding diamond workpiece, and the grinding force variation law, the stress and the phas...
Abstract: To improve the reliability of the PDC cutting teeth selection, from the perspective of thermal performance, the PDC cutting teeth of different manufacturers were analyzed by the laser Raman spectroscopy at room temperature and high temperature and the thermogravimetry analysis. Combined with high te...
Abstract: The development of Chinese superhard material industry in 2019 was analyzed with the collected statistics of the industry. It is believed that the industry is in its limited development, whose main economic indicators all turn down, especially the total profit decreasing as much as 34%. However, the...