Pure-phase bulk polycrystalline diamonds are prepared through direct phase transition at ultrahigh pressure and high temperature. The phase composition and microstructure of the pure-phase bulk polycrystalline diamonds are studied by SEM, XRD and Raman spectrum. It is found that with different raw m...

Traditional polycrystalline diamond (PCD) has been widely used in the fields of mechanical processing and mineral exploration. However, due to the existence of binders or sintering aids, the deterioration of mechanical properties greatly limits its applications. Nano-polycrystalline diamond (NPD), w...

In this paper, the recent progress of free-standing diamond films prepared by DC (direct current) arc plasma jet is reviewed from arc characteristics, diamond crystal quality, mechanical properties, optical properties and thermal properties. The results shows that the crystalline quality and stress ...

To enhance the bonding strength between diamond coating and matrix, chemical vapor deposition was used to deposit diamond coatings on ordinary and diamond-impregnated cemented carbides, separately. SEM, Raman and indentation tests were used to analyze and compare the coatings. Results show that both...

The pre-mixed filler metal is made by adding Fe, Al and Si elements in the Cu-Sn-Ti pre-alloy filler metal. 17 kinds of proportioning schemes are determined by using the extreme vertex mixture design method with both upper and lower bounds. The mechanical properties of the solders were evaluated by ...

Titanium nitride on the surface of cubic boron nitride (CBN) was obtained by heat treatment of Ti and CBN with microwave and salt molten. Chemical compositions, phase compositions and microstructures were analyzed and characterized using XRD, SEM and EDS methods. The results show that TiN, Ti₂N, TiN_...

Metal powders, such as Fe, Cu, Sn and WC, were used to prepare metal bond by conventional and microwave pressureless-sintering. The effects of different sintering processes on the densification and impact toughness of metal bonds were studied. SEM was used to observe the microstructure of the bond. ...

The mechanical properties and microstructures of 75Ni8 gang saw steel are investigated by changing the brazing processes. The experiments select 7 kinds of brazing materials for induction brazing. The mechanical properties and microstructure are analyzed by using mechanical test machine, impact test...

The traditional manufacturing methods of metal matrix diamond composite tools usually have some typical disadvantages, such as lower holding strength of metal matrix to diamond grits, shorter protrusion height of diamond grits, and it is hardly to produce some specially designed diamond tools with c...

Using Ni-Cr and Cu-Sn-Ti solders to produce the brazed Ti-coated and uncoated diamond drills, the performances of four types of diamond drill bits were investigated through the drilling test of vitrified brick. The results show that the average life of Ti-coated diamond drill using Ni-Cr solder braz...

In order to improve the grinding quality of fused silica optics and reduce the depth of subsurface defect (SSD), the experiment of grinding fused silica and theoretical analysis were carried out by parallel diamond grinding wheels with straight edge and circular edge. The stress concentration on the...

The grinding tools arranged in order of superhard abrasives are the new varieties of the series of grinding tools,their working surfaces have grinding edges which are arranged in a regular pattern. Compared with the traditional abrasive tools, they have the advantages of large chip space, sharpness ...

Yttrium aluminum garnet (YAG) is a kind of excellent laser crystal, while it is a hard-brittle material with Mohs hardness of 8.5. In order to remove the defects such as scratches and pits easily produced during the polishing, copper plate was used as rough polishing and the effect of load and rotat...

When the nickel base superalloy and other materials are machined by simple magnetic grinding process, the failure of magnetic abrasive particles seriously affect the grinding effect of the magnetic grinding process. In order to solve this technical problem, electrochemistry is combined with the abra...

In order to improve the plane polishing efficiency of the cluster magnetorheological, some polishing disks with different microstructures were proposed to increase the hydrodynamic pressure of the plane polishing. Polishing experiments and polishing force characteristic experiments were carried out ...

The machining mechanism of cluster magnetorheological plane finishing and the action mechanism of dynamic magnetic fields were analyzed. The magnetorheological polishing experiments of dynamic magnetic field on silicon substrate were carried out. Results show that the dynamic magnetic field can make...