Hard alloy hard surfacing electrode and preparation method thereof

Abstract

The invention discloses a hard alloy hard surfacing electrode and a preparation method thereof. The hard alloy hard surfacing electrode is prepared by compounding hard alloy particles and matrix alloy, wherein the matrix alloy comprises, by mass percentage, 55-75% of copper, 16-45% of nickel, 1-12% of manganese and 0.5-3% of X element, and the X element is selected from at least one of titanium and chromium; the mass ratio of the hard alloy particles to the matrix alloy is 1:(0.6-2.4); the granularity of the hard alloy particles is 0.5-12mm. The preparation method includes: using a pouring dieand a pouring forming process to process qualified molten matrix metal to obtain the hard surfacing electrode. The prepared hard surfacing electrode is high in matrix metal strength and low in melting point; by adding the X element, the contact angle between the matrix alloy and the hard alloy particles is lowered, interface compatibility between the two is improved, and the hard alloy particlesare less prone to stripping.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to a hard alloy wear-resistant surfacing electrode and a preparation method thereof. Background technique [0002] Tungsten carbide composite wear-resistant surfacing electrode has excellent high-temperature wear resistance and certain impact resistance, and has been widely used in metallurgy, mining, machinery and petroleum and other industrial sectors. Foreign countries have done some research on this kind of wear-resistant surfacing welding electrodes. The tensile strength of the matrix metal of the surfacing welding electrodes developed by them is greater than 850MPa, and the hardness is greater than HB200. It has high wear resistance and practical value, but the price is more expensive. Domestic research on hard alloy wear-resistant surfacing started relatively late, and the products produced have the following problems: 1. The matrix metal has a high melting point,...

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Problems solved by technology

Foreign countries have done some research on this kind of wear-resistant surfacing welding electrodes. The tensile strength of the matrix metal of the surfacing welding electrodes developed by them is greater than 850MPa, and the hardness is greater than HB200. It has high wear resistance and practical value, but the price is more expensive. Domestic research on hard alloy wear-resistant surfacing started relatively late, and the products produced have the following problems: 1. The matrix metal has a high melting point, and a higher heating temperature is required during the surfacing process, which makes the hard alloy burn 2. The strength of the matrix metal is low, and the surfacing layer is prone to cracks during wear; 3. The wettability of the matrix metal to the cemented carbide particles is poor, and the bonding strength between the cemented carbide particles and the matrix metal is low, and the cemented carbide is easy to Spalling, the above factors affect its application in production to varying degrees, so it is very important to develop a matrix metal with high strength, fluidity, and good wetting with cemented carbide particles, which can effectively improve the use of weldments life

[0003] At present, the mechanical properties of YD series hard alloy wear-resistant welding rods in China have been greatly improved compared with the past. Their tensile strength has reached 650MPa, and their hardness is greater than HB150. However, the problem of poor bonding between matrix metal and hard alloy has not been resolved.