A method for preparing dual-performance dp-Ti(C,N) cermets by using oxide materials
A cermet, dual-performance technology, applied in the fields of machining and powder metallurgy, can solve the problems of raw material waste and unstable quality of sintered products of cermet materials, and achieve the effect of reducing waste
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Embodiment 1
[0031] The first is the preparation of the mixture: Ti(C, N) powder, WC powder, Ni powder, Mo powder, graphite powder and other raw materials are used. Mixture of Mo: 7.4, C: 11.4, N: 4.2, O: 1.9. Anhydrous ethanol is used as the ball milling medium, the amount of anhydrous ethanol is 0.7:1 in the ratio of alcohol to material, YG8 cemented carbide balls are used as grinding balls, and the ratio of ball to material is 7:1; / min, the time is 36h, and the mixture is obtained and dried in an oven at 80°C. The drying material is mixed with 4% paraffin as a forming agent, and after drying, it is passed through a 60-mesh sieve for granulation. The pelletized material is pressed and formed under a certain pressure (160Mpa). The compact is placed in a vacuum carbon tube furnace for dewaxing pre-sintering and high temperature liquid phase vacuum sintering. The dewaxing and pre-sintering temperature is 860°C, the heating rate is 0.7°C / min, Ar gas is charged as carrier gas throughout t...
Embodiment 2
[0035] The raw materials and component combination, mixing method, preparation process and sintering route of Example 1 were adopted. In Example 2, the mechanical pumping force was increased in the dewaxing and pre-sintering process, the Ar filling pressure of the carrier gas was maintained at 0.35 bar, and the vacuum degree in the furnace was reduced to 1.5×10 2 ~2.7×10 2 between Pa. The subsequent sintering process was the same as that in Example 1, and a cermet sintered body was prepared. Figure 5 As shown, the scanning structure of the sintered body is the same as that obtained in Example 1, which is a typical core-shell cermet structure, and the "black core-grey shell" hard phase has an obvious gray outer ring phase. The surface layer of the sintered body formed a high-hardness hard phase surface layer, and the thickness of the surface layer was 0.8-1.1 μm, which was slightly thinner than that of Example 1. Through image analysis, the volume fraction of the hard phase...
Embodiment 3
[0038] The mass fraction of the material components is Ti, 53.8; W, 4.5; Ni, 10.9; Co, 6.8; Mo, 5.7; C, 12.2; N, 4.7; O, 1.4. The mass percentages of oxygen content of the raw materials were Ti(C,N), 1.02%; Ni, 0.80%; Mo, 5.57%; WC, 2.05%; Co, 2.01%. The mixing method and the pressing method are the same as those in Example 1. The degreasing pre-sintering process and the liquid-phase sintering process are the same as those in Example 1. The surface layer of the prepared sintered body also forms a high-hardness hard phase surface layer, and the thickness of the surface layer is 1.1-1.5 μm. After testing, the surface hardness of the sintered body is 1827HV, the core hardness is 1456HV, the transverse fracture strength is 1645MPa, and the fracture toughness is K. IC 10.9MPa m 1 / 2 . It can be seen that the bonding phase metal Ni is partially replaced by Co, the carbon potential difference formed in the sintered body and the capillary force caused by it are basically unaffecte...
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