Method and powder for preparing copper water jacket based on low pressure cold spray additive manufacturing technology

Abstract

The invention relates to a method for preparing a copper water jacket based on a low-pressure cold-spraying additive manufacturing technology, and powder. The method comprises the steps of before spraying, sand blasting a copper plate and a copper pipe applied to preparing the copper water jacket, and removing oxide skins and dirty marks on the cold-spraying surfaces of the copper plate and the copper pipe; S2, adopting a self-made powder material for carrying out cold-spraying additive preparation on the sand-blasted copper plate and copper pipe, wherein the spraying parameters comprise: thecold-spraying working gas is compressed air, the carrier gas temperature is 260 to 320 DEG C, the carrier gas pressure is 0.6 to 0.8MPa, the spraying distance is 10 to 20mm, and the spraying speed is0.4 to 0.6m / s; and S3, placing the copper water jacket prepared through cold spraying into a heat treatment furnace, carrying out heat treatment for 2 to 4h, furnace cooling, and taking out to obtainthe prepared copper water jacket. The powder is prepared from the components in percentage by mass: 55 percent to 65 percent of electrolytic copper powder, 25 percent to 35 percent of atomized copperpowder, and 10 percent of Al2O3 powder, wherein the sum of the weight percentage of the components is 100 percent.

Description

technical field [0001] The invention relates to low-pressure cold spraying additive manufacturing technology. Background technique [0002] The copper water jacket is installed as a cooling device in high heat flow areas such as the furnace waist, bosh, and furnace body of the metallurgical furnace to avoid damage to these areas due to overheating. [0003] Cold spraying is also called cold gas power spraying. It uses compressed gas (air, helium, nitrogen and mixed gas, etc.) as the acceleration medium to carry solid metal particles and hit the substrate at high speed. A new spraying process that deposits a coating. The cold spraying technology has the following characteristics: (1) The heating temperature is low: the powder particles are accelerated in the non-oxidizing hot air flow during the spraying process. Due to the low heating temperature, the coating is hardly oxidized, and the cold spraying coating and The oxygen content of the original powder is almost the same,...

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Problems solved by technology

(3) The porosity of the coating is low: the cold spray coating is deposited by the plastic deformation of the particles colliding with the substrate in a solid state with a high speed. The coating has not been cooled in the molten state, and there is no volume change. The layer is impacted and compacted so that the coating has a very low porosity

The copper water jacket prepared based on the aforementioned steps has a long service life and good thermal conductivity, but relatively speaking, this preparation method is more traditional, the process is more complicated, and the cost is higher

At present, the copper water jacket in the prior art also has the problems of being difficult to form, complex in process, prone to casting defects, resulting in poor thermal conductivity and cooling performance, and difficult to process and manufacture.

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