UDC 539.216.2
O. O. Onoprienko*, V. I. Ivashchenko
Institute for Problems of Materials Science named after I. M. Frantsevich, NAS of Ukraine, Kyiv, Ukraine
*onopr@ipms.kiev.ua
Solid solutions in films of ternary carbides and nitrides of transition metals of groups IV–VI: structure and properties. Review (pp. 3-23)
The review presents the results of theoretical calculations and experimental studies of the structure, state of bonds between atoms, mechanical properties, thermal stability and resistance to oxidation of films of ternary nitrides and carbides of some transition metals of groups IV–VI of the periodic table.
Keywords: coating, nitride, carbide, solid solution.
UDC 621.921.34-488:621.9.048.7
Yanling Liao1, Fenglin Zhang1,*, Peng Wang1,Xiaozhu Xie1,Yumei Zhou2, Delong Xie3
1School of Mechanical and Electronic Engineering, Guangdong University of Technology, Guangzhou, P. R. China
2School of Mechanical and Electronic Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, P. R. China
3Guangxi Key Laboratory of Superhard Materials, Guilin, P. R. China
*zhangfl@gdut.edu.cn
Experimental study on the fabrication of microhole arrays on CVD diamond film using a nanosecond pulsed laser (pp. 24-40)
The influence of its parameters, such as pulse width, scan rate, on the shape, size and morphology of lattice microholes drilled on CVD diamond film using a nanosecond pulsed laser was investigated. and scanning time. Arrays of microholes with an inlet diameter of 49.1–56.3 μm, an outlet diameter of 4.6–10.6 μm, and a taper angle of less than 18.5° were obtained and it was found that the laser pulse width has little effect on the inlet diameter, but with an increase in the pulse width, the diameter and depth of the microhole outlet increase, while the taper angle decreases. With an increase in the laser scanning speed, the diameter of the inlet hole of the microhole decreased slightly, and the outlet diameter and taper angle changed little. It was found that the scanning time has little effect on the inlet diameter of the microhole, but with an increase in the scanning time, the outlet diameter of the microhole increased, and the taper angle decreased.
Keywords: laser processing, microhole gratings, nanosecond pulse laser, CVD diamond film, micromachining.
UDC 669.018.25
I. O. Gnatenko*, I. V. Andreev, V. P. Bondarenko
V. M. Bakul Institute of Superhard Materials, NAS of Ukraine, Kyiv, Ukraine
*gnatenko_i@ukr.net
Analysis of the influence of high pressures and temperatures on the formation of the structure and properties of hard alloys of the WC–Co type (pp. 41-45)
The influence of barothermic (HPHT) treatment on the structure and properties of carbides of refractory metals and alloys based on them is considered. The main directions of research are determined. A comparative analysis of the data obtained in the study of the mechanical properties of WC–Co hard alloys after sintering at high pressures and temperatures is carried out. It is determined that the decisive role in the formation of the structure and mechanical properties of WC–Co alloys during HPHT treatment is played by the process temperature, under the condition of constant pressure.
Keywords: hard alloy, sintering, high pressure, structure.
UDC 622.24.051.64
Zhiming Wang, Xiaohong Fang*, Wucheng Sun, Longchen Duan, Songcheng Tan
Faculty of Engineering, China University of Geosciences, Wuhan, P. R. China
*duyaoff@163.com
D-optimal design of the mixture of Fe-based pre-doped diamond bit matrix with low liquid phase content (pp. 46-61)
A new system of diamond matrix component composition was investigated from three types of Fe-based pre-doped powder with low liquid phase content, which were used to manufacture the matrix of impregnated diamond bit. The D-optimal design method of the mixture was used to design the experimental scheme with 16 groups of samples. The samples were manufactured under the same conditions by sintering and hot pressing, and then hardness, bending strength and relative density were tested. The results were analyzed using regression analysis, and the relationships and interactions of the composition components with the properties of the matrix were established. The fracture surface of the samples after the bending strength test was examined using a scanning electron microscope. It was found that the composition of the samples FAM1020 (Fe–18Ni–2Co, average particle size – 38 μm) and FAM2120 (Fe–6Ni–6Cu–3Sn, average particle size – 36 μm) positively affects the bending strength of the metal matrix composite. It was proved that the composition of the sample FAM2120 positively affects the hardness of the matrix, but negatively – on the bending strength of the diamond matrix composite. The interaction of these three types of powders can improve the characteristics of the matrix. According to the result, the pre-alloyed Fe-based bit matrix with a low liquid phase content can meet the matrix requirements for diamond bit. Based on this research experiment, the optimal matrix formulation was 50% X1, 30% X2, 20% X3 (by weight).
Keywords: D-optimal mix design, regression other analysis, impregnated diamond bit, iron-based matrix, low liquid phase content.
UDC 661.873:543.21:66.046.4
Israf Ud Din1, *, Tooba Saeed2, Zahoor Ahmad2, Abdul Naeem2, Abdulrahman I. Alharthi1, Mshari A. Alotaibi1
1Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University, Al-Kharj, Saudi Arabia
2National Centre of Excellence in Physical Chemistry, University of Peshawar, Pakistan
*drisraf@yahoo.com
Comparative study of the effect of annealing on the temperature-dependent magnetic properties of cobalt ferrite nanoparticles (pp. 62-69)
A wet chemical method was used to synthesize cobalt ferrite nanoparticles (CFN) and subsequent annealing at 1000 °C. The effect of annealing on the structure, morphology and crystallinity of the synthesized material was investigated using various characterization techniques, such as field emission scanning electron microscopy, Fourier transform infrared, thermogravimetric analysis and X-ray diffraction. It was shown that after annealing at 1000 °C, cobalt ferrite nanoparticles become more stable, have larger crystallite size, lattice constant and larger cation distribution between octahedral and tetrahedral centers compared to the unannealed initial cobalt ferrite nanoparticles. The magnetic properties of both the initial and annealed cobalt ferrite nanoparticles were determined using a vibrating sample magnetometer. It was shown that the saturation magnetization increased with annealing, while the inverse was true for the coercive force. The reason for the decrease in coercive force is the effect of pinning at the gain boundary. The hysteresis loop slowly flattens out as the temperature approaches the Curie temperature.
Keywords: wet chemical technology; magnetic properties, cobalt ferrite nanoparticles, thermogravimetric analysis, hysteresis loop.
UDC 622.23:621.921.1:620.178.162
Jialiang Wang*, 1, Shaohe Zhang2, 3, Xian Yang4, Fenfei Peng1
1Hunan University of Science and Technology, National Local Joint Engineering Laboratory of Marine Mineral Resources Exploration Equipment and Safety Technology, Xiangtan, P. R. China
2Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha, P. R. China
3School of Geosciences and Info-Physics, Central South University, Changsha, P.R. China
4School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, P.R. China
*Jialiangwang2019@163.com
Effect of distribution of hard brittle abrasives on diamond cutting performance (p. 70-83)
Using friction wear testing, scanning electron microscopy, energy dispersive spectroscopy and other methods in combination with tribology theory and micromechanical processing principles, the influence of the distribution of hard brittle abrasives and diamond grains in hot-pressed sintered specimens on the cutting characteristics and fracture of diamond grains was investigated. It was shown that the distribution of hard brittle abrasives significantly affects the wear resistance and protrusion characteristics of diamond grains in different ways and to different degrees. The influence is greater when hard brittle abrasives and diamond grains are in contact with each other than when they are separated and not in contact. The influence of the contact of hard brittle abrasives and diamond grains on the cutting performance in the back, side and front parts of the diamond grain is in decreasing order. The impact can be divided into three categories: micro-indentation, local wear and weakening of the holding force, which synergistically affect the cutting performance.
Keywords: impregnated diamond bit, hard brittle abrasives, cutting performance, distribution morphology, frictional wear.
UDC 621.623
Yu. D. Filatov*, V. I. Sidorko, S. V. Kovalev, V. A. Kovalev
V. M. Bakul Institute of Superhard Materials, NAS of Ukraine, Kyiv, Ukraine
*filatov@ism.kiev.ua
The influence of intermolecular interaction between polishing powder particles and the processed material on the polishing performance of optical surfaces (pp. 84-92)
As a result of the study of the patterns of the influence of intermolecular interaction between polishing powder particles and the processed material on the polishing performance and roughness of polished surfaces of optical parts and elements made of glass, sieves, optical and semiconductor crystals, it was found that the removal performance of the processed material linearly decreases with an increase in the Lifshitz constant and the potential of intermolecular interaction of the dispersed phase particle with the processed surface. It is shown that the polishing performance and the roughness parameters of the processed surfaces decrease with an increase in the transfer energy. It is found that the ratio η/Ra linearly increases with a decrease in the Lifshitz constant. It has been shown that using a dispersed polishing system made of micro- and nanopowders, it is possible to achieve the required level of polishing performance and roughness of the treated surfaces.
Keywords: polishing, dispersed system, polishing performance, surface roughness.
UDC 666.3:539.5
I. P. Fesenko1,*, L. V. Viduta2, D. V. Chasnyk3, V. B. Nechytaylo2, I. A. Petrusha1, O. M. Kaydash1, Yu. Yu. Rumyantseva1, V. V. Smokvyna1, V. I. Chasnyk4, V. V. Garashchenko1, Yu. M. Tuz5, V. P. Rukin4, N. O. Mulyavko2
1V. M. Bakul Institute of Superhard Materials, NAS of Ukraine, Kyiv, Ukraine
2Institute of Physics, NAS of Ukraine, Kyiv, Ukraine
3Ukrainian Research Institute of Special Equipment and Forensic Examinations of the Security Service of Ukraine, (ISTE SBU), Kyiv Kyiv, Ukraine
4DP NDI ORION, Kyiv, Ukraine
5NTU KPI named after Igor Sikorsky, Kyiv, Ukraine
*igorfesenko@ukr.net
Electrical resistance of an island gold film on the surface of thermobarically sintered cBN-ceramics (pp. 93-96)
The electrophysical properties of island gold films on the surface of cubic boron nitride are reported. The electrical resistance value is calculated and compared with the resistance of similar films on dielectrics with different values of the thermal conductivity coefficient (glass, sapphire, aluminum nitride).
Keywords: thermobaric sintering, cubic boron nitride, gold, island film, electrical resistance.