Beijing Gang Yan Diamond Products Company

Beijing, China

Beijing Gang Yan Diamond Products Company

Beijing, China
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Xu L.,Beijing Gang Yan Diamond Products Company | Liu Y.,Beijing Gang Yan Diamond Products Company | Xu Q.,Beijing Gang Yan Diamond Products Company | Shen N.,Beijing Gang Yan Diamond Products Company
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2017

The advantages of dry drilling bit are introduced, as well as the status of domestic dry drilling market, and the principle of the bit matrix design. Ultra-fine tungsten copper alloy powder helps to solve the problems of sintering and drilling in experiment. Tungsten copper alloy powder (mass fraction 45%), with metal powder(Cu, Co, Ni, etc.), is used to make experimental bit matrix through the process of granulation, pre-compression, dewaxing, sintering, and welding. Results show that when sintered at 850℃, and 25 MPa for 180 s, the hardness of bit segment is more than HRB110, and the effect of diamond grit protrusion is good. Compared with the drilling bit imported from Korean, the granite drilling efficiency of domestic bit is increased by 7%, while the life is equal with Korean drilling bit, which reflects the good performance of dry drilling. © 2017, Diamond & Abrasives Engineering Editorial Office. All right reserved.


Xu Q.,Control Iron and Steel Research Institute, China | Liu Y.-B.,Control Iron and Steel Research Institute, China | Liu Y.-B.,Beijing Gang Yan Diamond Products Company | Xu L.,Beijing Gang Yan Diamond Products Company | Yan Z.-W.,Beijing Gang Yan Diamond Products Company
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2017

Two Fe-based pre-alloy powders (Fe43Co24Cu33 and Fe56Co14Cu30 referred as A and B) prepared by hydrometallurgical process were studied in this paper. The morphology and oxygen content of the powder particles were compared and analyzed. These Fe-based pre-alloy powders were sintered at 750, 800, 850, 900, and 950℃, respectively. Rockwell hardness (HRD) was measured by HR-150A Rockwell Hardness Tester. The flexural strength of the specimen was measured by three-point bending method. The fracture morphology of the specimens was observed by scanning electron microscopy (SEM). The results show that with the increase of sintering temperature, the density of these specimen increases. When the temperature exceeds 850℃, the density gradually tends to be gentle. The hardness of the test specimen increases with increasing temperature and then decreases. The hardness of specimen B is higher than that of specimen A before 850℃, and reaches the maximum value at 800℃. When the temperature is higher than 850℃, The hardness of specimen A is higher than that of specimen B. The bending strength of the two test specimen increases with increasing temperature. The sintered specimen of pre-alloyed powder A is less sensitive to temperature, when the temperature reaches 850℃, the grains almost stop growing. The sintered specimen of pre-alloying powder B is relatively sensitive to temperature, and the grains grow up with increasing temperature. © 2017, The Editorial Office of POWDER METALLURGY TECHNOLOGY. All right reserved.


Shu H.-X.,Beijing GangYan Diamond Products Company | Zhang G.-Q.,Beijing GangYan Diamond Products Company | He Z.-F.,Beijing GangYan Diamond Products Company | Xu Z.-P.,Beijing GangYan Diamond Products Company
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2012

In order to obtain good quality and tight thickness deviation of green segment of diamond saw blade, granulating treatment of the metal powder is needed to improve the flowability and bulk density of the powder. In this paper, two granulating processes, namely sieve rubbing method and high speed stirring granulation method were experimentally studied and compared. Powder particle morphology, bulk density, flowability, as well as the green segment properties were tested. The results showed that: the powders prepared by sieve rubbing method had lower bulk density, while the powders prepared by high speed stirring granulation method had a batter flowability. Meanwhile, the green segment made with the powders from high speed stirring granulation method showed an improved mass homogeneity.


Cao C.,Central Iron & Research Institute Group | Liu Y.,Central Iron & Research Institute Group | Liu Y.,Beijing Gang Yan Diamond Products Company | Xu L.,Beijing Gang Yan Diamond Products Company | And 2 more authors.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2015

In order to study the influence of granulating process on the properties of Cu-Sn prealloy powder diamond tools, the experiment was carried out through adding different types and different contents of granulating agents. Furthermore, the granulated powders prepared at the same condition were to be dewaxed at different temperatures. Then, the changes of mechanical properties of hot-pressing sintering diamond tool samples were tested. The results showed that KCP-1700 was the most applicable granulating agent in this experiment, and that adding different kinds of granulating agents all caused the reduction of mechanical properties of the samples. It was also shown that the mechanical properties of the mixed powder were significantly increased when the content of granulating agent was over 130 mL/kg, and that 400 ℃ dewaxing process would basically make granulating agent completely decomposed, so the granulated powder could meet both the requirements of cold pressing process and the demand of mechanical properties of sintered sample at the same time. ©, 2015, Zhengzhou Institute of Abrasives Grinding. All right reserved.


Yang H.,Beijing Gang Yan Diamond Products Company | Liu Y.,Beijing Gang Yan Diamond Products Company
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2016

To study the influence of fixing agent on quality of brazed diamond tools, three agents namely SZ, NH and GY are made into testing samples. Their surfaces are observed and actual cutting & drilling experiments are implemented. Results show that GY agent leaves least residual carbide with best appearance, while NH agent ranks second and SZ agent performs worst. As with the blades and bits made with these three agents, those made with GY agent have longest work life and fastest speed, followed by those made with NH agent and those made with SZ agent lists in the bottom. © 2016, Diamond & Abrasives Engineering Editorial Office. All right reserved.


Xu Q.,Central Iron & Research Institute Group | Liu Y.,Central Iron & Research Institute Group | Liu Y.,Beijing Gang Yan Diamond Products Company | Xu L.,Beijing Gang Yan Diamond Products Company | Yang Z.,Beijing Gang Yan Diamond Products Company
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2016

The diamond bit matrix formulas are designed by uniform design with constraints to study the effects of diamond bit matrix formula on sharpness and life. Nonlinear regression analysis of experimental data is performed in SPSS to obtain the relationship between the performance and the component. At the same time, the sequence of influence factors and the significance are revealed using t test. Finally, the optimized formula is obtained through excel programming. The results show that the established Scheffe regression equation has a good fit to the experimental results. The content of Co element has a significant influence on the sharpness and life of diamond bit. The uniform design of the formula can reach desired result with less tests. © 2016, Diamond & Abrasives Engineering Editorial Office. All right reserved.


Liu Y.,Beijing Gang Yan Diamond Products Company | Wang L.,GRIPM Advanced Materials Co. | Wang L.,CompuTherm LLC | Zhang C.,CompuTherm LLC
Advanced Materials Research | Year: 2013

Rare earth silicates (RE2SiO5 or RE2Si2O7; RE=Er, Lu, Y, Yb etc.) possess a low silica activity and good thermal stability, making them good candidates for EBC top coating materials. We have performed first-principles total energy calculations for the Er2O3-SiO2 pseudo binary system. The crystal lattice parameters and internal atomic coordinates of Er2SiO5 and Er2Si2O7 are optimized, and the electronic structure and formation enthalpies are calculated. The present study provides a theoretical basis for exploring practical applications of the materials. © (2013) Trans Tech Publications, Switzerland.


Shen X.,Advanced Technology & Materials Co. | Shen X.,Beijing Special Powder Metallurgy Materials Engineering and Technology Research Center | Yao J.,Beijing Gang Yan Diamond Products Company | Ma H.,Advanced Technology & Materials Co. | And 3 more authors.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2015

The hot pressing sintering organization, XRD phase composition and the mechanical properties of alloy powder containing 10wt%, 15wt%, 20wt% Sn respectively were researched systematically. It was identified that due to the low sintering temperature of Cu-Sn powder, the densification could be achieved at 700-720 ℃, and that the single solid solution sintering organization containing 10wt% of Sn was converted to two phases electronic compounds organization, which coincided with XRD spectrum inclination. The bending strength, which stayed around 700 MPa, changed little with increasing Sn content, while impact toughness dropped from 17 J to 3 J. Taking the matrix characteristics into consideration it was concluded that the Cu-Sn powder, when used as matrix, was conducive to improve the machining efficiency of tools. ©, 2015, Zhengzhou Institute of Abrasives Grinding. All right reserved.


Xu L.,Beijing Gangyan Diamond Products Company | Qu X.-H.,University of Science and Technology Beijing | Liu Y.-B.,Beijing Gangyan Diamond Products Company
Gongneng Cailiao/Journal of Functional Materials | Year: 2011

This paper applied twice plating on diamond, first the diamond surface was plated with Cr using magnetron sputtering method, and then the diamond with Cr-plating was put into rotary drum to be barrel plated thicker with Cu element; after copper plating the mass ratio of diamond and copper can reach 1:1-1:2, and the thickness of copper plating can be to 3-20 microns. The diamond with copper plating was sintered in mold by SPS method and then got diamond-Cu composites. The thermal conductivity of composites was up to 480W/(m·K). The process can be a good solution to solve the problem of uneven mixing because of the large proportion difference between diamond and copper, which greatly improves the thermal conductivity.


Cao C.,Central Iron & Research Institute Group | Liu Y.,Central Iron & Research Institute Group | Liu Y.,Beijing Gang Yan Diamond Products Company | Xu L.,Beijing Gang Yan Diamond Products Company | And 2 more authors.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2016

In order to study the influence of sintering process on the properties of Cu-Sn pre-alloy powder with high Sn content, orthogonal experiment was carried out. The influence factors and optimal parameters were determined using range analysis method, and the experimental results were compared using SEM, microstructure observation and mechanical property tests, etc. The results showed that as with density, hardness and wear resistance of the samples sintering temperature had the biggest influence, followed by holding time and pressure while as with bending strength of the samples, sintering temperature came first, followed by pressure and holding time. It was shown that when the sintering parameters were 440 ℃, 180 s and 10 MPa, the properties was better, which could be optimal experimental program. © 2016, Diamond & Abrasives Engineering Editorial Office. All right reserved.

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