Nickel base alloy powder for intaking and exhausting valve sealing surface weld deposit of automobile

Abstract

The invention discloses nickel base alloy powder for overlaying welding of the sealing surface of the intake and outlet valve of automobiles. The nickel base alloy powder comprises the components with the following weight portions of 25-27 percent of Cr, 4-6 percent of Mo, 10-15 percent of Fe, 2-3 percent of Si, 1.5-2 percent of B, 0.65-0.75 percent of C and Ni for the rest. The beneficial effects of the invention are (1) low cost, (2) good technological properties and (3) high hardness. The nickel base alloy powder can take the place of cobalt base alloy powder and has low cost. The price of the nickel base alloy powder is one third of the price of the cobalt base alloy powder. The nickel base alloy powder is especially suitable for plasma overlaying welding technology and vacuum furnace melting technology of the sealing surface of the intake and outlet valve of automobiles and locomotives. Compared with Stellite No. 6 cobalt base alloy powder, the welding layer of the invention processed by the same plasma arc overlaying welding technology has a same volume loss (mm <3>) in wear test. By comparing the hardness of the nickel base alloy powder with the hardness of the Stellite No. 6 cobalt base alloy powder, the two powders have the same hardness HRC which is 43 after the powders are cooled to room temperature. The two powder after being welded have the same hardness under 400-700 centigrade temperature in the furnace, while the nickel base alloy powder has better red-hardness.

Description

technical field [0001] The invention relates to a surface-coated metal alloy powder, in particular to a nickel-based alloy powder for surfacing welding of the sealing surface of an automobile intake and exhaust valve. Background technique [0002] At present, in the existing technology, Stellite No. 6 cobalt-based alloy powder is commonly used for surfacing welding of the sealing surface of automobile intake and exhaust valves, because the sealing surface of automobile intake and exhaust valves itself requires high temperature resistance and wear resistance, and cobalt-based alloy powder belongs to High-temperature wear-resistant materials, such as the internationally recognized Stellite No. 6 cobalt-based alloy powder, have good high-temperature and wear-resistant properties. However, due to the lack of cobalt raw materials in my country and its high price, its use is limited. Therefore, industrial and mining enterprises are eager to replace cobalt-based alloy powder with l...

AI Technical Summary

Problems solved by technology

However, due to the lack of cobalt raw materials in my country and its high price, its use is limited. Therefore, industrial and mining enterprises are eager to replace cobalt-based alloy powder with low-cost, high-quality, high-temperature and wear-resistant materials to meet the sealing requirements of automobile intake and exhaust valves. Technical requirements for surface surfacing