Structural-Phase State of the Interphase Boundary at Thermal Diffusion Metallization of Diamond Grains by Fe, Ni and Co

2020 ◽  
Vol 992 ◽  
pp. 676-682
Author(s):  
P.P. Sharin ◽  
M.P. Akimova ◽  
S.P. Yakovleva
Keyword(s):  
Thermal Diffusion ◽  
Interphase Boundary ◽  
Phase State ◽  
Structural Phase ◽  
Adhesive Interaction ◽  
Experimental Conditions ◽  
Structural Phase State ◽  
Metallized Coating ◽  
Diffusion Metallization ◽  
Complex Structural

Structural-phase state of the diamond-metallized coating interphase boundary after thermal diffusion metallization of diamond grains by transition metals Fe, Ni and Co were studied. Metallization were conducted under temperature-time mode corresponding to the sintering of cemented carbide matrices with Cu impregnation. The structural-phase state of the metallized coating and diamond-coating interphase boundary was studied by scanning electron microscopy, X-ray phase analysis and Raman spectroscopy. A metallized coating strongly adhered to the diamond forms during thermal diffusion metallization of diamond by iron. The metallized coating has a complex structural phase composition of iron, a solid solution of carbon in iron and graphite phases. Nickel and cobalt cause intense catalytic graphitization of diamond with the formation of numerous traces of erosion on its surface under the heating conditions specified in the experiment. The observed weak adhesive interaction of these metals with diamond is probably due to the high melting temperatures of the Ni-C and Co-C eutectics, which does not allow the metals to react with diamond under given experimental conditions.

Structural-Phase State of the Interphase Boundary at Thermal Diffusion Metallization of Diamond Grains by Cr and Ti

2020 ◽  
Vol 992 ◽  
pp. 670-675
Author(s):  
P.P. Sharin ◽  
M.P. Akimova ◽  
S.P. Yakovleva
Keyword(s):  
Thermal Diffusion ◽  
Interphase Boundary ◽  
Phase State ◽  
Structural Phase ◽  
Cemented Carbide ◽  
Carbide Powder ◽  
Structural Phase State ◽  
Metallized Coating ◽  
Diffusion Metallization ◽  
Diamond Retention

Structural-phase state of the diamond-metallized coating interphase boundary after thermal diffusion metallization of diamond grains by transition metals Cr, Ti were studied. Metallization were conducted under temperature-time mode corresponding to the sintering of cemented carbide matrices with Cu impregnation. The structural-phase state of the metallized coating and diamond-coating interphase boundary was studied by scanning electron microscopy, X-ray phase analysis and Raman spectroscopy. It was found that a thin continuous metal carbide coating chemically bonded to the diamond and consisting of the corresponding metal, their carbides and small amount of graphite phases is formed during thermal diffusion metallization of diamond by Cr and Ti under the conditions specified in the experiment. It was shown that graphite is formed not by a continuous layer, but in the form of local inclusions. This ensures a strong adhesion of the metallized coating to the diamond through the carbides of the corresponding metals. The results can be useful in the development of compositions and technological methods that provide an increased level of diamond retention in the matrices of tools based on cemented carbide powder mixtures.

Features of the Structural-Phase State of the Diamond-Matrix Boundary Zone in Diamond-Containing Composite Materials

2019 ◽  
Vol 945 ◽  
pp. 756-762
Author(s):  
P.P. Sharin ◽  
M.P. Akimova ◽  
S.P. Yakovleva
Keyword(s):  
Phase State ◽  
Structural Phase ◽  
Cemented Carbide ◽  
Specific Productivity ◽  
Matrix Composites ◽  
Structural Phase State ◽  
X Ray ◽  
Hybrid Technology ◽  
Metallized Coating ◽  
Diamond Retention

Preliminary metallization of the diamond component, which promotes the formation of chemical bonds on the diamond-matrix contact during subsequent sintering, is used to increase the strength of diamond retention and the durability of diamond-containing metal matrix composites. There are restrictions on carrying out metallization to create diamond composites with a cemented carbide matrix, since reheating the metallized coating at high sintering temperatures of carbide powders leads to its destruction, diamond graphitization and deterioration of the material properties. The structural-phase state in the diamond-matrix contact zone has been studied and the main factors providing the strength of diamond retention in diamond-cemented carbide composites obtained by hybrid technology that excludes the reheating of the metallized coating have been revealed. It was revealed, that the developed hybrid technology combining the thermal diffusion metallization of diamond and sintering according to the self-dosed impregnation scheme in one cycle ensures the production and preservation of the metallized coating by the methods of scanning electron microscopy, X-ray diffraction and X-ray phase analysis, Raman spectroscopy. Comparative tests have been carried out and it is shown that the specific productivity of experimental samples of a diamond tool (ruling pencils) with a metallized diamond component is on 39% higher than same parameter of pencils without metallization.

Influence of composition on the structural-phase state, electrophysical and magnetotransport properties of alloy thin films based on Co and Cu

Vacuum ◽  
2021 ◽  
Vol 187 ◽  
pp. 110141
Author(s):  
I.O. Shpetnyi ◽  
I.Yu Protsenko ◽  
S.I. Vorobiov ◽  
V.I. Grebinaha ◽  
L. Satrapinskyy ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase State ◽  
Structural Phase ◽  
Structural Phase State

Influence of ball milling duration on the morphology, features of the structural-phase state and microhardness of 3Ni-Al powder mixture

2021 ◽  
Author(s):  
Ivan A. Ditenberg ◽  
Denis A. Osipov ◽  
Michail A. Korchagin ◽  
Ivan V. Smirnov ◽  
Konstantin V. Grinyaev ◽  
...  
Keyword(s):  
Ball Milling ◽  
Powder Mixture ◽  
Phase State ◽  
Structural Phase ◽  
Structural Phase State ◽  
Milling Duration ◽  
Al Powder

Effect of Alloying Elements on the Structural Phase State of Hadfield Steel

2021 ◽  
Vol 33 (11) ◽  
pp. 04021324
Author(s):  
Almira Zhilkashinova ◽  
Mazhyn Skakov ◽  
Madi Abilev ◽  
Dossym Yerbolatuly
Keyword(s):  
Phase State ◽  
Structural Phase ◽  
Alloying Elements ◽  
Hadfield Steel ◽  
Structural Phase State ◽  
Effect Of Alloying

scholarly journals Influence of electrolytic plasma nitriding mode on structural phase state of pearlitic steel

2018 ◽  
Vol 143 ◽  
pp. 03004
Author(s):  
Natalya Popova ◽  
Lyudmila Erygina ◽  
Elena Nikonenko ◽  
Mazhin Skakov
Keyword(s):  
Phase State ◽  
Plasma Nitriding ◽  
Water Solution ◽  
Lath Martensite ◽  
Structural Phase ◽  
Pearlitic Steel ◽  
Parallel Plates ◽  
Structural Phase State ◽  
Original State ◽  
Α Phase

The paper describes results of studies of phase transitions in structural phase state occurring in the type 0.34C-1Cr-1Ni-1Mo-Fe steel under electrolytic plasma nitriding in nitrogen-containing water solution. The nitriding voltages considered in the given study were 550 and 600 V. The research was conducted by means of X-ray diffraction electron microscopy. The specimens were studied in two states : 1) before modification (original state) and 2) after nitriding in the surface layer of the specimen. The study was conducted on thin foils. It was found that nitriding lead to significant changes in the structure of steel, namely in its phase composition and in the number of existing phases. In the original state the structure of steel was given as lamellar pearlite, ferritic carbide mix and fragmented ferrite. After 550 V nitriding it was lath martensite, plates of α-phase, with colonies of thin parallel plates of γ-phase and coarse grains of α-phase, containing γ-phase grains which were different in size and shape and were various-directional. Increase in nitriding voltage up to 600 V lead to change in the structure given as a lamellar non-fragmented pearlite and fragmented ferrite. The original state was marked by presence of particles of M3C cementite, after nitriding irrespective of the voltage it had the particles of M3C alloyed cementite, Fe3Mo3N nitride and Cr2C0.61N0.39 carbonitride. The sizes, volume fractions and locations of particles were dependent on nitriding voltage.

The structural-phase state and magnetoresistive properties of thin film alloys obtained by co-evaporated Cu and Co

2019 ◽  
Vol 474 ◽  
pp. 624-631 ◽  
Author(s):  
I.O. Shpetnyi ◽  
D.M. Kondrakhova ◽  
S.I. Vorobiov ◽  
B. Scheibe ◽  
V.I. Grebinaha ◽  
...  
Keyword(s):  
Thin Film ◽  
Phase State ◽  
Structural Phase ◽  
Structural Phase State
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