Nonmagnetic hard alloy and preparation method

Abstract

The invention discloses a nonmagnetic hard alloy. The nonmagnetic hard alloy comprises the following components in percentage by weight: 6 to 18 percent of nickel, 0.5 to 1.5 percent of chrome carbide and the balance of tungsten carbide. The nonmagnetic hard alloy has the advantages of simple component, high hardness, good abrasion resistance and strong corrosion resistance. A preparation method for the nonmagnetic hard alloy comprises raw material preparation, wet milling, drying, pressing, sintering and the like, wherein the raw material comprises the following components in percentage by weight: 8 to 15 percent of nickel powder, 0.5 to 1.5 percent of chrome carbide powder and the balance of tungsten carbide powder; during material preparation, a forming agent is added; spray drying is performed at the temperature of between 90 and 100 DEG C; and a de-waxing and sintering integrated process is adopted, the furnace temperature is raised to between 450 and 550 DEG C in 25 to 45 hours, the removal of the forming agent is finished, then the furnace temperature is raised in 7 to 9 hours till the product produces a liquid phase, high-purity argon is introduced into the furnace, the furnace temperature is raised to a final sintering temperature of between 1,460 and 1,480 DEG C for 1 to 2 hours, the heat is preserved for 30 to 60 minutes, then the high-purity argon is introduced into the furnace, the heat is continuously preserved for 30 to 60 minutes, and then the product is cooled. The preparation method not only can prepare the nonmagnetic alloy of common specification, but also can meet the preparation and performance requirements of the large-sized nonmagnetic alloy.

Description

technical field [0001] The invention relates to a hard alloy material and a preparation method thereof, in particular to a non-magnetic hard alloy material and a preparation method thereof. Background technique [0002] Non-magnetic cemented carbide has obvious advantages in molding molds and sealing rings for strong magnetic powder in the powder metallurgy industry. It not only has high hardness and wear resistance, but also can avoid sticking molds during strong magnetic powder molding, improving Corrosion resistance of the sealing ring. In the existing non-magnetic alloy manufacturing methods, the hardness and strength of non-magnetic alloys are improved by adding various elements, cryogenic treatment, and aging treatment. However, the effects of cryogenic and aging treatments on cemented carbide are still controversial. Products with a larger single weight are also not suitable or the effect is difficult to detect. Chinese patent application "A non-magnetic hard alloy ...

AI Technical Summary

Problems solved by technology

However, it is difficult to control the carbon content of the alloy, and it is difficult to guarantee the consistency of the material and the uniformity of the green compact density, especially for large-scale products (unit weight ≥ 10Kg or diameter ≥ 150mm) prone to cracks, bending deformation, and large-scale products cannot be guaranteed The densification and uniformity of properties