Effect of SiC whiskers on mechanical properties of thermally stable polycrystalline diamond prepared by HPHT sintering

Zhao, Yabo; Li, Liqiang; Ji, Huanli; Sun, Kun; Li, Zhihong

doi:10.1016/j.diamond.2018.10.007

Cited by 21 publications

(2 citation statements)

References 25 publications

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“…2500 • C). This system is most often used for the production of synthetic diamonds [63], PCD (composites based on polycrystalline diamonds) [64,65], cBN (regular boron nitride) and PcBN (polycrystalline cubic boron nitride) [61]. As a result of the simultaneous effects of pressure and temperature, the sintering process is much faster than in the case of free sintering.…”

Section: Fabrication Of Test Materialsmentioning

confidence: 99%

Corrosion Resistance of Nickel-Aluminum Sinters Produced by High-Pressure HPHT/SPS Method

et al. 2023

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As part of extensive research on the properties of nickel-aluminum alloys, corrosion tests of sintered materials produced by the innovative HPHT/SPS (high pressure, high temperature/spark plasma sintering) method were performed in 0.1 molar H2SO4 acid. The hybrid, unique device used for this purpose (one of only two such devices operating in the world) is equipped with a Bridgman chamber, which allows heating with high-frequency pulsed current and sintering of powders under high pressure in the range of 4–8 GPa and at temperatures up to 2400 °C. Using this device for the production of materials contributes to the generation of new phases not obtainable by classical methods. In this article, the first test results obtained for the nickel-aluminum alloys never before produced by this method are discussed. Alloys containing 25 at.% Al, 37 at.% Al and 50 at.% Al were produced. The alloys were obtained by the combined effect of the pressure of 7 GPa and the temperature of 1200 °C generated by the pulsed current. The time of the sintering process was 60 s. The electrochemical tests, such as OCP (open circuit potential), polarization tests and EIS (electrochemical impedance spectroscopy), were carried out for the newly produced sinters and the results were compared with the reference materials, i.e., nickel and aluminum. The corrosion tests showed good corrosion resistance of the produced sinters, with corrosion rates of 0.091, 0.073 and 0.127 mm per year, respectively. It leaves no doubt that the good resistance of materials synthesized by powder metallurgy is due to the proper selection of the manufacturing process parameters, ensuring a high degree of material consolidation. This was further confirmed by the examinations of microstructure (optical microscopy and scanning electron microscopy) and the results of density tests (hydrostatic method). It has been shown that the obtained sinters were characterized by a compact, homogeneous and pore-free structure, though at the same time differentiated and multi-phase, while the densities of individual alloys reached a level close to the theoretical values. The Vickers hardness of the alloys was 334, 399 and 486 HV10, respectively.

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Section: Fabrication Of Test Materialsmentioning

confidence: 99%

Corrosion Resistance of Nickel-Aluminum Sinters Produced by High-Pressure HPHT/SPS Method

et al. 2023

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“…The cooling water inside the coil creates a cooling field within a specific range, facilitating heat circulation. However, this method leads to lower energy utilization during the sintering of the drill bits [25][26][27][28][29]. For the equipment for preparing drill bits via hot processing as described above, firstly, the metal powder of the skeleton of the matrix is mixed according to the designed proportion, and a certain concentration of diamond is mixed in the working layer and loaded into the graphite mold; the heating and pressurization are carried out at the same time, according to the designed sintering process (generally full pressure of 10-15 Mpa, maximum temperature of about 1000 °C), and the impregnated diamond drill bits can be made [30,31].…”

Section: Introductionmentioning

confidence: 99%

Research on Low-Carbon, Energy-Saving Sintering Process with Uniform Temperature for Drill Bits

Wang,

Gao,

et al. 2023

Energies

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A low-carbon and energy-saving sintering process with uniform temperature distribution has been developed to address several issues associated with the sintering of drill bits in medium-frequency furnaces, namely, the large circumferential temperature differences, uneven heating of the mold, and low energy utilization. Theoretical calculations indicated that the output energy of the conventional drill bit sintering process was 12.7 kW·h, with an energy loss of 8.84 kW·h. The low-carbon sintering process achieved an output energy of 4.2 kW·h, with an energy loss of only 0.26 kW·h. Consequently, the energy utilization rates for the two processes were 30.4% and 93.8%, respectively. It was observed through the experiment that when sintering 76/49 mm drill bits at insulation temperatures of 900 °C and 1080 °C, the circumferential temperature differences in the mold were 43.7 °C and 48 °C, respectively, in the conventional drill bit sintering process. In contrast, the circumferential temperature differences in the mold were reduced to 8.7 °C and 11.3 °C, respectively, in the low-carbon and energy-saving sintering process with uniform temperature. This indicates that the average circumferential temperature difference in the mold can be reduced by 81.61% at 900 °C and by 76.46% at 1080 °C, leading to improved drill bit quality.

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Failure Probability Estimation of Thermally Stable Diamond Composite Rock Cutting Tips in Underground Roadway Development

Sun

Guo

2022

Lecture Notes in Mechanical Engineering

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Effect of SiC whiskers on mechanical properties of thermally stable polycrystalline diamond prepared by HPHT sintering

Cited by 21 publications

References 25 publications

Corrosion Resistance of Nickel-Aluminum Sinters Produced by High-Pressure HPHT/SPS Method

Corrosion Resistance of Nickel-Aluminum Sinters Produced by High-Pressure HPHT/SPS Method

Research on Low-Carbon, Energy-Saving Sintering Process with Uniform Temperature for Drill Bits

Failure Probability Estimation of Thermally Stable Diamond Composite Rock Cutting Tips in Underground Roadway Development

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