The Experts below are selected from a list of 1941 Experts worldwide ranked by ideXlab platform
Songcheng Tan - One of the best experts on this subject based on the ideXlab platform.
-
Effect of Fe-based pre-alloyed powder on the microstructure and holding strength of impregnated Diamond Bit matrix
International Journal of Refractory Metals and Hard Materials, 2019Co-Authors: Zhao Xiaojun, Long Chen Duan, Songcheng Tan, Fang XiaohongAbstract:Abstract An iron-rich pre-alloyed powder was selected out, and the pre-alloying degree of matrix materials and the sintering temperature were considered to investigate the effect of the Fe-based pre-alloyed powder on the microstructure and holding strength of impregnated Diamond Bit matrix. And relative density and bending strength of the specimens were measured, and then the resulting fracture surfaces were analyzed using scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The results showed that the relative density, bending strength and plasticity of matrix materials are increased with the sintering temperature and the pre-alloying degree. The influence of the pre-alloying degree on them is more significant than that of the sintering temperature within the experimental parameters. Besides, Fe-based matrices have thermal corrosion effect on Diamonds at high temperature sintering process. And the rate of Diamond graphitization has a greatly increase with the sintering temperature changes from 900 °C to 1020 °C and the holding strength decreases. A low pre-alloying degree accelerates the rate of Diamond graphitization. But an adequate pre-alloying degree of Fe-based matrix materials is conducive to improve the wettability of the matrix to Diamonds, alleviate the Diamond graphitization, reduce the Diamonds' thermal damage and improve the holding strength. Besides, it can also greatly reduce the sintering temperature and broaden the sintering temperature range. In a word, it is feasible and reasonable that Fe-based pre-alloyed powders replace Fe elemental powders to fabricate impregnated Diamond Bits. And it has a good economic value and broad application prospect.
-
Effects of MoS2 and WS2 on the matrix performance of WC based impregnated Diamond Bit
Tribology International, 2019Co-Authors: Songcheng Tan, Long Chen Duan, Bing Suo Pan, Wenjiao Zhang, Minou RabieiAbstract:Abstract MoS2 and WS2 with different concentrations were added to a hot-pressing WC based impregnated Diamond Bit matrix, in order to investigate the effects of the solid lubricants on the mechanical, wear and frictional properties of the self-lubricating composites. Hardness, flexure strength, impact toughness, abrasion weight loss and coefficient of friction were measured by a series of tests. Also, the full broken section morphologies of the self-lubricating composites after the flexure strength test, as well as the wear surfaces were observed and analyzed by scanning electron microscope. Test results indicate that the effects of MoS2 and WS2 on the mechanical, wear and frictional properties of the WC based IDB matrix are similar, while WS2 obtains a better self-lubricating performance than MoS2.
-
a new composite impregnated Diamond Bit for extra hard compact and nonabrasive rock formation
International Journal of Refractory Metals & Hard Materials, 2014Co-Authors: Xiaohong Fang, Songcheng Tan, Kaihua Yang, Long Chen DuanAbstract:Abstract In this study, a new composite impregnated Diamond Bit was designed to solve the slipping problem when impregnated Diamond Bit is used for extra-hard, compact, and nonabrasive rock formation. The new Bit is composed of sintered Diamond-impregnated (SDI) cutters and support body. The support body has weaker resistance to abrasion and would thus wear out faster than SDI cutters during drilling operation. Such design decreases the contact area between the Bit work layer and the rock formation and increases the unit load acting on the work layer and the single Diamond, thereby improving drilling efficiency. The design parameters and manufacturing technology of the new composite impregnated Diamond Bit were analyzed to achieve the desired performance. Two Ф41/27 mm laboratorial Bits were manufactured to conduct a laboratory drilling test on the rock specimens of fine-grained monzonitic granite rich in biotite. The laboratory drilling test indicated that both the manufacturing technology and the drilling parameters significantly affect the rate of penetration (ROP). The test also indicated that the abrasive resistance of the Bit work layer was proportional to the area ratio of SDI cutters to Bit bottom face. A very small or very large area ratio in the radial direction causes annular groove or wale at that section, respectively. Therefore, optimization was conducted to coordinate the abrasiveness of the drilled rock formation and abrasive resistance of the Bit work layer, and a Ф91.5/71 mm composite impregnated Diamond Bit was manufactured. The new Bit was applied to a hydropower station drilling construction in Fujian Province, China. Field drilling application indicated that the ROP of the new Bit was approximately three to four times that of the Bits produced by other factories. The ROP relationship was completely similar to the ratio of the applied load acting on a single Diamond of the new composite to ordinary impregnated Diamond Bits.
Wei Chen - One of the best experts on this subject based on the ideXlab platform.
-
Effect of matrix composition on the performance of Fe-based Diamond Bits for reinforced concrete structure drilling
International Journal of Refractory Metals and Hard Materials, 2020Co-Authors: Wei Chen, Chao Deng, Jun-de YangAbstract:Abstract A prealloyed Fe powder with high wear resistance and cold pressure molding ability was selected for Diamond Bit drilling into strong abrasive rock formations, such as reinforced concrete. The prealloyed Fe powder was layered along the radial direction of the Diamond Bit through cold pressing. A special shape was formed on the lip surface of the Bit during drilling, which improved the drilling efficiency. In this paper, the matrix properties of a new impregnated Diamond Bit for reinforced concrete formation, composed of prealloyed Fe, prealloyed Cr Fe, Cu and 660-Cu, Ni and Co were studied, and the performance difference with the Fe-based formula is discussed. X-ray diffractometry (XRD) was used to determine the phases, and SEM was used to observe the micromorphology of the fracture. A regression model was selected to explore the influence of the matrix composition on the hardness and bending strength. The conclusions are as follows. The Fe-based matrix mixture test was carried out by the extreme vertex design method. The polynomial regression equations for the matrix composition, hardness, and bending strength were fitted. The calculated matrix values and experimental values matched closely. The higher the content of prealloyed Cr Fe was, the higher the hardness, but the brittle phase fractured the matrix, and the bending strength of the matrix decreased. The hardness and bending strength of the matrix increased with an increase in the Ni and Co contents. Cu enhanced the Ni and Fe, and the increase in Cu and 660-Cu content increased the bending strength of the matrix. The performance data for the Fe-based formula showed that adding an appropriate amount of prealloyed Cr Fe powder, Cu and 660-Cu, Ni, and Co to the Fe-based matrix effectively improved the mechanical properties of the sintered body. Two formulas were determined through the experiments and sintered into drill Bits for on-site drilling. The results show that the use of a prealloyed Fe-based powder formula system effectively improved the drilling efficiency and drilling life of the Bit, and the comprehensive performance of the Bit was significantly improved.
-
Study on Effect of Sintering Pressure on the Properties of Diamond Bit
Advanced Materials Research, 2013Co-Authors: Jun De Yang, Yang Yan Huang, Wei ChenAbstract:High pressure is demanded in producting Diamond Bit by cold-pressing. Although the pressure could be reduced by hot-pressing, a certain pressure is demanded to ensure the compactness of Diamond Bit matrix. Four sintering parameters, sintering temperature, holding time, sintering pressure and the pressing mode, are mainly included during producting Diamond Bit by hot-pressing. This article mainly discusses the effect of sintering pressure on the properties of Diamond Bit. First, select a general formula of Diamond Bit, take sintering pressure as variable, other parameters remaining immovability; then load and sinter a set of samples in this parameter. Testing and analysing the samples by mechanical properties test, such as bending, tension, compression, and rigidity, and SEM fracture analysis, we obtain the optimum sintering pressure in this formula.
Long Chen Duan - One of the best experts on this subject based on the ideXlab platform.
-
Effects of MoS2 and WS2 on the matrix performance of WC based impregnated Diamond Bit
Tribology International, 2019Co-Authors: Songcheng Tan, Long Chen Duan, Bing Suo Pan, Wenjiao Zhang, Minou RabieiAbstract:Abstract MoS2 and WS2 with different concentrations were added to a hot-pressing WC based impregnated Diamond Bit matrix, in order to investigate the effects of the solid lubricants on the mechanical, wear and frictional properties of the self-lubricating composites. Hardness, flexure strength, impact toughness, abrasion weight loss and coefficient of friction were measured by a series of tests. Also, the full broken section morphologies of the self-lubricating composites after the flexure strength test, as well as the wear surfaces were observed and analyzed by scanning electron microscope. Test results indicate that the effects of MoS2 and WS2 on the mechanical, wear and frictional properties of the WC based IDB matrix are similar, while WS2 obtains a better self-lubricating performance than MoS2.
-
Effect of Fe-based pre-alloyed powder on the microstructure and holding strength of impregnated Diamond Bit matrix
International Journal of Refractory Metals and Hard Materials, 2019Co-Authors: Zhao Xiaojun, Long Chen Duan, Songcheng Tan, Fang XiaohongAbstract:Abstract An iron-rich pre-alloyed powder was selected out, and the pre-alloying degree of matrix materials and the sintering temperature were considered to investigate the effect of the Fe-based pre-alloyed powder on the microstructure and holding strength of impregnated Diamond Bit matrix. And relative density and bending strength of the specimens were measured, and then the resulting fracture surfaces were analyzed using scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The results showed that the relative density, bending strength and plasticity of matrix materials are increased with the sintering temperature and the pre-alloying degree. The influence of the pre-alloying degree on them is more significant than that of the sintering temperature within the experimental parameters. Besides, Fe-based matrices have thermal corrosion effect on Diamonds at high temperature sintering process. And the rate of Diamond graphitization has a greatly increase with the sintering temperature changes from 900 °C to 1020 °C and the holding strength decreases. A low pre-alloying degree accelerates the rate of Diamond graphitization. But an adequate pre-alloying degree of Fe-based matrix materials is conducive to improve the wettability of the matrix to Diamonds, alleviate the Diamond graphitization, reduce the Diamonds' thermal damage and improve the holding strength. Besides, it can also greatly reduce the sintering temperature and broaden the sintering temperature range. In a word, it is feasible and reasonable that Fe-based pre-alloyed powders replace Fe elemental powders to fabricate impregnated Diamond Bits. And it has a good economic value and broad application prospect.
-
a new composite impregnated Diamond Bit for extra hard compact and nonabrasive rock formation
International Journal of Refractory Metals & Hard Materials, 2014Co-Authors: Xiaohong Fang, Songcheng Tan, Kaihua Yang, Long Chen DuanAbstract:Abstract In this study, a new composite impregnated Diamond Bit was designed to solve the slipping problem when impregnated Diamond Bit is used for extra-hard, compact, and nonabrasive rock formation. The new Bit is composed of sintered Diamond-impregnated (SDI) cutters and support body. The support body has weaker resistance to abrasion and would thus wear out faster than SDI cutters during drilling operation. Such design decreases the contact area between the Bit work layer and the rock formation and increases the unit load acting on the work layer and the single Diamond, thereby improving drilling efficiency. The design parameters and manufacturing technology of the new composite impregnated Diamond Bit were analyzed to achieve the desired performance. Two Ф41/27 mm laboratorial Bits were manufactured to conduct a laboratory drilling test on the rock specimens of fine-grained monzonitic granite rich in biotite. The laboratory drilling test indicated that both the manufacturing technology and the drilling parameters significantly affect the rate of penetration (ROP). The test also indicated that the abrasive resistance of the Bit work layer was proportional to the area ratio of SDI cutters to Bit bottom face. A very small or very large area ratio in the radial direction causes annular groove or wale at that section, respectively. Therefore, optimization was conducted to coordinate the abrasiveness of the drilled rock formation and abrasive resistance of the Bit work layer, and a Ф91.5/71 mm composite impregnated Diamond Bit was manufactured. The new Bit was applied to a hydropower station drilling construction in Fujian Province, China. Field drilling application indicated that the ROP of the new Bit was approximately three to four times that of the Bits produced by other factories. The ROP relationship was completely similar to the ratio of the applied load acting on a single Diamond of the new composite to ordinary impregnated Diamond Bits.
-
Study on Bit Body Materials Made of Tungsten Carbide and Steel Shot
Key Engineering Materials, 2011Co-Authors: J. L. Peng, Long Chen Duan, Shao Lin XuAbstract:This paper introduces a new kind of Diamond Bit body material. The characteristics of this material are as follows: the outer Bit body cast with tungsten-carbide and the inside is steel shot. So the Bit body has got high wear resistance on the outside and good mechanical properties inside at the same time. The mechanical properties inside and the wear resistance outside of the Bit were tested. The paper also introduces how to apply a film of mixture of glue-included tungsten-carbide on the surface of the Bit mold and graphite stick. The improvements of mechanical properties inside and maintenance of wear resistance outside have made much choice to design wider and deeper junk slots. Thus the performance of Bit has been improved.
Fang Xiaohong - One of the best experts on this subject based on the ideXlab platform.
-
Effect of Fe-based pre-alloyed powder on the microstructure and holding strength of impregnated Diamond Bit matrix
International Journal of Refractory Metals and Hard Materials, 2019Co-Authors: Zhao Xiaojun, Long Chen Duan, Songcheng Tan, Fang XiaohongAbstract:Abstract An iron-rich pre-alloyed powder was selected out, and the pre-alloying degree of matrix materials and the sintering temperature were considered to investigate the effect of the Fe-based pre-alloyed powder on the microstructure and holding strength of impregnated Diamond Bit matrix. And relative density and bending strength of the specimens were measured, and then the resulting fracture surfaces were analyzed using scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The results showed that the relative density, bending strength and plasticity of matrix materials are increased with the sintering temperature and the pre-alloying degree. The influence of the pre-alloying degree on them is more significant than that of the sintering temperature within the experimental parameters. Besides, Fe-based matrices have thermal corrosion effect on Diamonds at high temperature sintering process. And the rate of Diamond graphitization has a greatly increase with the sintering temperature changes from 900 °C to 1020 °C and the holding strength decreases. A low pre-alloying degree accelerates the rate of Diamond graphitization. But an adequate pre-alloying degree of Fe-based matrix materials is conducive to improve the wettability of the matrix to Diamonds, alleviate the Diamond graphitization, reduce the Diamonds' thermal damage and improve the holding strength. Besides, it can also greatly reduce the sintering temperature and broaden the sintering temperature range. In a word, it is feasible and reasonable that Fe-based pre-alloyed powders replace Fe elemental powders to fabricate impregnated Diamond Bits. And it has a good economic value and broad application prospect.
Jun-de Yang - One of the best experts on this subject based on the ideXlab platform.
-
Effect of matrix composition on the performance of Fe-based Diamond Bits for reinforced concrete structure drilling
International Journal of Refractory Metals and Hard Materials, 2020Co-Authors: Wei Chen, Chao Deng, Jun-de YangAbstract:Abstract A prealloyed Fe powder with high wear resistance and cold pressure molding ability was selected for Diamond Bit drilling into strong abrasive rock formations, such as reinforced concrete. The prealloyed Fe powder was layered along the radial direction of the Diamond Bit through cold pressing. A special shape was formed on the lip surface of the Bit during drilling, which improved the drilling efficiency. In this paper, the matrix properties of a new impregnated Diamond Bit for reinforced concrete formation, composed of prealloyed Fe, prealloyed Cr Fe, Cu and 660-Cu, Ni and Co were studied, and the performance difference with the Fe-based formula is discussed. X-ray diffractometry (XRD) was used to determine the phases, and SEM was used to observe the micromorphology of the fracture. A regression model was selected to explore the influence of the matrix composition on the hardness and bending strength. The conclusions are as follows. The Fe-based matrix mixture test was carried out by the extreme vertex design method. The polynomial regression equations for the matrix composition, hardness, and bending strength were fitted. The calculated matrix values and experimental values matched closely. The higher the content of prealloyed Cr Fe was, the higher the hardness, but the brittle phase fractured the matrix, and the bending strength of the matrix decreased. The hardness and bending strength of the matrix increased with an increase in the Ni and Co contents. Cu enhanced the Ni and Fe, and the increase in Cu and 660-Cu content increased the bending strength of the matrix. The performance data for the Fe-based formula showed that adding an appropriate amount of prealloyed Cr Fe powder, Cu and 660-Cu, Ni, and Co to the Fe-based matrix effectively improved the mechanical properties of the sintered body. Two formulas were determined through the experiments and sintered into drill Bits for on-site drilling. The results show that the use of a prealloyed Fe-based powder formula system effectively improved the drilling efficiency and drilling life of the Bit, and the comprehensive performance of the Bit was significantly improved.