Influence of the matrix composition, structure and properties on the service life of diamond drills
https://doi.org/10.17073/1997-308X-2016-1-60-66
Abstract
The study covers microstructure and mechanical properties of 4 matrices with complex chemical composition: VK15–Cu, VK15–Cu–Sn, VK20–Cu, and VK20–Cu–Sn used in the production of diamond drilling tools. The sample matrices was produced by infiltration of hard-metal mouldings with copper at t = 1100 °C and with bronze at t = 1000 °C. Thin sections of diamond-free matrices were prepared, their metallographic and microprobe analyzes were made, their hardness, micro-hardness, density and porosity were found. The hardness of matrices was measured according to the HRC scale, their microhardness was measured using the PMT-3 device under the 2N load. As a result it was revealed that 1) infiltration of the VK15 and VK20 hard-metal mouldings with copper and brass based melts produces hard and strong matrices for diamond tools with maximum 3 % apparent porosity, and the infiltration process is more complete when using bronze; 2) the most hard are the matrices obtained by infiltration of the VK15 hardmetal mouldings with bronze. The use of the VK20 hard-metal based mouldings matrices when manufacturing diamond drilling tools is inadvisable because of the sharp decrease in its abrasive capacity when drilling hard materials.
Keywords
About the Authors
N. I. Polushin
MISIS
Russian Federation
Russian Federation
Cand. Sci. (Eng.), head of Scientific-research laboratory of superhard materials (SRL SHM),
119991, Moscow, Leninsky pr., 4
A. V. Bogatyrev
MISIS
Russian Federation
Russian Federation
postgraduate student, Department of power effective energy saving resources of industrial technologies,
A. I. Laptev
MISIS
Russian Federation
Russian Federation
Dr. Sci. (Eng.), leading researcher of SRL SHM,
M. N. Sorokin
MISIS
Russian Federation
Russian Federation
senior researcher of SRL SHM,
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Review
For citations:
Polushin N.I., Bogatyrev A.V., Laptev A.I., Sorokin M.N. Influence of the matrix composition, structure and properties on the service life of diamond drills. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2016;(1):60-66. (In Russ.) https://doi.org/10.17073/1997-308X-2016-1-60-66
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