Kharchenko O. Determination of effective nitrogen pressure during sintering of fine-grained tool carbide WC-Co with high durability

The thesis is devoted to the definition of effective nitrogen pressure during sintering of fine-grained tool carbide WC -Co with high wear resistance , and thermal desorption gas research with them. Established that the elimination of some large pore size of 50-100 microns , reducing the size of the residual pores B4 to B1 in the structure of alloy VK10 OM VK8 M, which leads to physical and receipt maksymalnyyh mehanchnyh properties occurs at a pressure of 2.5 MPa nitrogen. Revealed that the structure of alloys after sintering and cooling under pressure nitrogen present 5 groups of residual gases , the amount of which correlated with the amount of pressure . Replacement excessive pressure on the vacuum 1 o 10-2-1 o 10-4 MPa on stage cooling reduces the content of residual gases, Co- phase free graphite. The maximum increase in fracture toughness alloys under which achieved no residual gas in their structure and minimum loss of Co provided vacuum when cooled 1 o 10-3 MPa. The technology is protected by a patent for an invention. Cooling gas pressure reduces wear kinetics under conditions of continuous turning of structural materials based on iron, titanium , nickel, etc. due to lack of adhesive wear. Cooling in vacuum increases durability in shock turning , due to lack mikroskolyuvannya cutting edge of the cutting plate. Optimized compression technology of sintering gas pressure to 5.0 MPa for fine-grained carbide VK10 OM and M VK8 with high performance properties.