SURFACE MODIFICATION OF SYNTHETIC GRINDING POWDERS DIAMOND WITH HEAT-RESISTANT OXIDES AND CHLORIDES LIQUID PHASE APPLICATION METHOD
Keywords:modification, method of liquid-phase deposition, thermal stability, oxides, physical properties, modification of oxides, diamond grinding powders
The restrictions to the selection of oxides, which may be interesting in the modification of forging heat-resistant oxides of the surface of diamond grinding powders, are defined. It is shown that the first group of the most efficient applied for modifying the surface of the diamond grinding powders includes the following oxides – B2O3, TiO2, SiO2 and Al2O3. The second group, less effective – ZnO, BaO and CaO. To achieve an additional positive effect from the modification it is possible to consider a double modification of surface of diamond grains with a mixture of oxides of the first group and chloride (СаСl2, NaCl). The process of grain surface modification of synthetic diamond grinding powders by heat-resistant oxides and chlorides of metals and non-metals by liquid phase application has been studied. The structural characteristics of the external structure have been studied and the quantitative elemental composition of the surface of modified powders has been determined. It is established that to achieve a guaranteed increase in wear resistance of diamond wheels when grinding hard alloys at least 2 times it is recommended to modify the surface of diamond grains with a combination of oxides: B2O3 grain surface modification (50 % grain) and Al2O3 grain surface modification (50 %).
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