High-temperature vacuum impregnation of micro- and ultradispersed diamond powders (MDDP and UDDP) of the ASM 50/40, ASM 14/10, ASM 10/7, ASM 5/3, and ASM 1/0 grades, metal powders Ti, V, Nb, Ta, Cr, Mo, W, Fe, Co, and Ni, as well and also their mixtures with some copper-based alloys was studied. It was determined that ASM 50/40 and ASM 14/10 diamond powders can be impregnated with an adhesive-active copper-based alloy Cu–20.3 Ti–4.6 Sn–2.8 Ni–0.15 Si–0.1 B. Diamond powders of ASM 10/7, ASM 5/3, and ASM 1/0 were not impregnated at all with such an alloy, as well as with nonadhesive-active alloys Cu–15.0 Sn, Cu–15.0 Ge, Cu–18.8 Ga. Metal powders Ti, V, Nb, Cr, Fe, Co, and Ni were well impregnated, and metal powders Ta, Mo, W were not impregnated with alloys Cu–15.0 Sn, Cu–15.0 Ge, Cu–18.8 Ga (except for the adhesive-active alloy). A thin oxide layer was always observed on the surface of metal powder particles. Metal powders of the first group (Ti, V, Nb, Cr, Fe, Co, Ni) are unstable and easily reduced by vacuum heating, and therefore are well wetted and impregnated with the studied alloys. In the second group (Ta, Mo, W), chemically resistant surface oxides interfered with the processes of wetting– impregnation. Due to the process of contact-reaction impregnation of MDDP or UDDP mixtures with Ta, Mo, and W metal powders, a non-porous high-strength composite material was obtained, in which the diamond grains are securely fastened. Oxides of such metals were partially reduced by diamond carbon, and the grain surfaces of diamond powders were metalized (covered with a thin layer of metal) due to partial evaporation of oxides, their deposition on the surface of diamond grains, and reduction to pure juvenile metals. Thus, both components of the mixture were very well wetted and impregnated with the investigated melts. The use of an adhesive-active alloy or a mixture of MDDP and UDDP powders with Ti, V, Nb, Cr, Fe, Co, Ni is undesirable due to the chemical interaction of Ti, V, Nb, Cr with the material of the mold used for the tool manufacture or diamond graphitization in the presence of process catalysts: Fe, Co, Ni.
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Translated from Poroshkova Metallurgiya, Vol. 60, Nos. 5–6 (539), pp. 142–150, 2021.
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Umansky, V.P. Impregnation of Micro- and Ultradispersed Diamond Powders with Copper-Based Alloys for Grinding Tool Manufacture. Powder Metall Met Ceram 60, 370–376 (2021). https://doi.org/10.1007/s11106-021-00247-9
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DOI: https://doi.org/10.1007/s11106-021-00247-9