Zhengzhou, China
Zhengzhou, China

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Xu X.-X.,Henan Polytechnic University | Zhang X.-H.,Henan Polytechnic University | Zhang C.-L.,Henan SF Diamond Co. | Zheng Y.-Y.,Henan Polytechnic University
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2013

On the YG6 carbide form milling cutter blade B212, a micron diamond film is deposited by hot filament chemical vapor deposition. Based on diamond coating preparation process for the form milling cutter blades, thermal stresses under different thermal loads between diamond films and carbide substrate are numerically simulated and calculated by means of the finite element method, and the effect of main process parameters is analyzed on diamond coating thermal stress. Then thermal stress properties of diamond films in different parts of the blade are validated from such characterization methods as scanning electron microscopy, Raman spectroscopy and indentation experiments. Results show that a lower growth temperature and a larger thickness of diamond films contribute to the reduction of thermal stress. Besides, under the existing preparation conditions, maintaining a substantially constant deposition temperature of 750°C, and depositing for 6 hours, the diamond film could be deposited to a thickness of about 10 μm with lower thermal stress and better quality, and the films exhibit good adhesion with the adhesive strength of 600~1000 N.

Zuo Q.,Zhengzhou University | Zuo Q.,Henan SF Diamond CO. | Wang W.,Zhengzhou University | Gu M.,Zhengzhou University | And 7 more authors.
Advanced Materials Research | Year: 2011

The continuous progress of the electronic industries put forward a new requirement to the electronic components that must have an excellent heat conduction performance. Thus diamond-Cu composite is developed as a high thermal conductivity and low coefficient of thermal expansion material. A vacuum hot pressing method is chosen to prepare diamond-Cu composites and the thermal conductivity of the diamond-Cu composite is researched. The effects of different contents of chromium, the size of diamond particles and the content of diamond particles on the thermal conductivity of the diamond-Cu composite are discussed. The results demonstrate that the chromium element can improve the thermal conductivity of the composites and the thermal conductivity is largest when the content of chromium is 3 percent. © (2011) Trans Tech Publications, Switzerland.

Gu M.,Zhengzhou University | Gu M.,Henan SF Diamond Co | Jin X.,Zhengzhou University | Xie H.,Zhengzhou University | And 3 more authors.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2010

To improve the wetting behavior of diamond and metallic matrix, the elecytroless plating of copper on diamond particles was introduced using two formulations with different reducing agents, and the copper films of dimaond were deoxidized at different temperatures in the atompsphere of hydrogen. The changes of structure and composition of copper films grown at different formulations and reduction temperatures were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that the copper films obtained by application of potassium. borohydride is mainly nano-crystalline and the film quality is better than that of formaldchyde. When the deoxidization temperautre is 300 C, the cuprous oxide is reduced to copper. This temperature has little influence on the morphology of the film and there is no grain growth found. The surface of copper films keep smooth and uniform. With temperature increasing. the grain size and surface roughenss of copper films increases gradually. Meanwhile, the colur of diamonds that copper of diamonds that copper films has been electroless plated becoms dim from original light purple.

Hu X.,Zhengzhou University | Zhu G.,Zhengzhou University | Zhang Y.,Zhengzhou University | Zhang Y.,Henan SF Diamond Co | And 9 more authors.
International Journal of Hydrogen Energy | Year: 2012

Mechanically treated aluminum-tin (Al-Sn) alloy, a novel hydrogen-generating material, was fabricated and found to react directly and immediately with water at room temperature. The maximum yield of hydrogen per unit volume of alloy was 2259 mL/cm3 (0.202 g/cm3). The mass ratio of the generated hydrogen and the Al-Sn alloy material was 4.86%. This percentage is much higher than that of traditional hydrogen storage alloys and can compete with metal hydrides. The combination of Al-Sn alloy powder and carbon nanotubes (CNTs) produced a new kind of Al-Sn/CNT composite that also reacts with water at room temperature. Al-Sn/CNT composites were synthesized using a high temperature and high-pressure method. When CNT content was held constant, composites with single-walled CNTs had higher reaction rates than those with multi-walled CNTs. The effects of mechanical treatment and CNT addition on enhancing the reaction between Al-Sn alloys or Al-Sn/CNTs and water were also analysed. © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights.

Feng F.,Henan SF Diamond Co. | Xie H.,Henan SF Diamond Co. | Xu H.-M.,Henan SF Diamond Co. | Fang H.-J.,Henan SF Diamond Co. | Zhang Y.-J.,Zhengzhou University
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2014

CB-600 is a kind of new PCBN material used in hardened steel machining, which is developed according to the principles of hardened steel machining and mechanism of PCBN sintering. Scanning electron microscopy, cutting experiments and on-site applications are implemented to compare the properties of CB-600, similar domestic product (FP-1) and foreign product (DP-1). SEM shows that the organization structure of CB-600 is samely uniform as DP-1. Results of continuous turning hardened steel show that CB-600 has good wear resistance, the flank wear width of which is 40% bigger than that of DP-1 and 68% smaller than that of FP-1. The interrupted turning shows that CB-600 and FP-1 can withstand more than 40 000 times impact without chipping, while the number of impacts at which big breakage occurrs on DP-1 is only 27 000. The number of workpieces for customers machining also proves that tool life of CB-600 is 1 times longer than that of FP-1. Thus, CB-600 has excellent performance in hardened steel machining.

Xie H.,Henan SF Diamond Co. | Feng F.,Henan SF Diamond Co. | Fang H.-J.,Henan SF Diamond Co. | Zhang Y.-J.,Zhengzhou University
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2012

The performances of PcBN sintered compact versus different volume fraction of TiN and Al are analyzed in order to get a better proportion of V(TiN):V(Al) in making PcBN compact. cBN(size 1~4 μm, purity 99.9%), TiN(size 2 μm, purity >99%)and Al (size 1~2 μm, purity >99.8%) were taken as starting materials, which were then thermal treated under 1×10 -3Pa and 850 °C for 3 h, and sintered in a HPHT cubic apparatus. Based on the test results of phase composition, hardness, density and microstructure analysis, it was found that the hardness and density of PcBN were reduced with the decrease of V (TiN):V (Al), while their relative density were affected by the new phases generated and the compactness after sintering. Experimental results showed that when V (TiN):V (Al) was 1:1 ~ 1:2, the samples had a homogeneous microstructure, higher relative density and a smaller flank wear after cutting for a certain distance. It is supposed that the optimal ratio of TiN:Al is 1:1 ~ 1:2 for the preparation of PcBN sintered compact.

Xie H.,Henan SF Diamond Co. | Feng F.,Henan SF Diamond Co. | Fang H.-J.,Henan SF Diamond Co. | Zhang Y.-J.,Zhengzhou University
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2013

Influences of volume ratio of TiC and Al on PCBN sintering and related properties were studied to obtain a better binder formula. The mixtures of CBN, TiC and Al, after 3 hours treatment in vacuum furnace at 850°C and 1×10-3 Pa, were sintered into PCBN composites at high temperature and high pressure. Analysis results showed that as the ratio of TiC and Al decreased, the hardness of PCBN increased and then decreased. Morphology of the composites was even and uniform. Continuous and intermittent cutting experiments showed that when the ratio of TiC to Al was 1:1 (sample S3), the PCBN sample possessed better wear resistance and impact resistance. For better sintering, the volume ratio of TiC and Al should be 1:1.

Wei J.,Henan SF Diamond Co. | Li H.-L.,Henan SF Diamond Co. | Zhang K.-M.,Henan SF Diamond Co. | Zhang W.-Y.,Henan SF Diamond Co. | And 2 more authors.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2013

The PCD surface polishing experiments are carried out using common fixtures and water-cooling fixtures. The temperatures of the grinding wheel, fixtures and PCD, the deformation degree of PCD and the efficiency and effect of polishing are compared under different load. It is found that only cooling the wheel is not enough, while cooling the grinding wheel, fixture and PCD at the same time will obtain higher polishing efficiency and better surface. Under certain conditions, the efficiency could be improved by water-cooling fixtures to three times as it used to be.

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