Method for preparing copper stainless steel in-situ composite material by adopting vacuum consumable arc melting

Abstract

The invention discloses a method for preparing a copper and stainless steel in-situ composite material through vacuum consumable arc melting. The method comprises the following steps that S1, raw materials are prepared, wherein 2 wt%-98 wt% of electrolytic copper powder and 98 wt%-2 wt% of gas atomization stainless steel powder are prepared; s2, raw material mixing, wherein the electrolytic copper powder and the gas atomization stainless steel powder are weighed according to the proportion and stirred and mixed in a mixer; s3, heading powder: filling the mixture into a rubber sleeve for heading powder; s4, pressing is conducted, specifically, the rubber sleeve subjected to powder upsetting is put into a cold isostatic press to be pressed into a blank; s5, sintering: putting the pressed green body into a vacuum sintering furnace for sintering; and S6, smelting is conducted, specifically, the sintered blank serves as a consumable electrode and is put into a vacuum consumable arc smelting furnace to be smelted. The copper stainless steel in-situ composite material prepared through the method is uniform in element distribution, less in macrosegregation, free of macroscopic and microcosmic defects such as element enrichment and good in structure uniformity.

Description

technical field

[0001] The invention relates to the technical field of powder metallurgy, in particular to a method for preparing a copper-stainless steel in-situ composite material by vacuum consumable arc smelting. Background technique

[0002] The powder metallurgy method is to mix copper powder and stainless steel powder, and then pressure sintering to prepare copper and stainless steel in-situ composite materials. The alloy prepared by this method has low density and low hardness, which seriously restricts its development. The material and stainless steel are put into an induction melting furnace for melting, and then rapidly cooled to prepare a copper-stainless steel in-situ composite material. The material prepared by this method is prone to segregation. In addition, the mold used in the melting process will produce outgassing, resulting in high gas content in the final material. , During the smelting process, the melt scouring the crucible will also bring in some imp...

Examples

Embodiment 1

[0042] A method for preparing copper and stainless steel in-situ composite materials by vacuum consumable arc smelting, comprising the following steps:

[0043] S1. Raw material ratio:

[0044] The material composition and its weight percentage are: electrolytic copper powder 2wt%, gas atomized stainless steel powder 98wt%; copper content of electrolytic copper powder reaches 99.8%, particle size is -200-300 mesh;

[0045] The preparation method of electrolytic copper powder is as follows: palladium sheet is used as anode, palladium needle is used as cathode, and anode current density is 2000A / m 2 , the cathode current density is 1200A / m 2 , the mixed solution composed of copper sulfate and sulfuric acid is used as the electrolyte, the electrolysis temperature is 35 ° C, the concentration of copper ions in the electrolyte is 5g / L, the alternating current is used for electrolysis, and the obtained electrolytic copper powder and the containing electrolyte are mixed. Liquid fil...

Embodiment 2

[0058] A method for preparing copper and stainless steel in-situ composite materials by vacuum consumable arc smelting, comprising the following steps:

[0059] S1. Raw material ratio:

[0060] The material composition and its weight percentage are: electrolytic copper powder 50wt%, gas atomized stainless steel powder 50wt%; copper content of electrolytic copper powder reaches 99.8%, particle size is -200-300 mesh;

[0061] The preparation method of electrolytic copper powder is as follows: palladium sheet is used as anode, palladium needle is used as cathode, and anode current density is 2800A / m 2 , the cathode current density is 1350A / m 2 , using the mixed solution composed of copper sulfate and sulfuric acid as the electrolyte, the electrolysis temperature is 45 ° C, the concentration of copper ions in the electrolyte is 6g / L, the alternating current is used for electrolysis, and the obtained electrolytic copper powder and the containing electrolyte are mixed. Liquid filt...

Embodiment 3

[0074] A method for preparing copper and stainless steel in-situ composite materials by vacuum consumable arc smelting, comprising the following steps:

[0075] S1. Raw material ratio:

[0076] The material composition and its weight percentage are: electrolytic copper powder 98wt%, gas atomized stainless steel powder 2wt%; copper content of electrolytic copper powder reaches 99.8%, particle size is -200-300 mesh;

[0077] The preparation method of electrolytic copper powder is as follows: palladium sheet is used as anode, palladium needle is used as cathode, and anode current density is 3500A / m 2 , the cathode current density is 1500A / m 2 , the mixed solution composed of copper sulfate and sulfuric acid is used as the electrolyte, the electrolysis temperature is 60 ° C, the concentration of copper ions in the electrolyte is 7g / L, the alternating current is used for electrolysis, and the obtained electrolytic copper powder and the containing electrolyte are mixed. Liquid fil...

technical field

[0001] The invention relates to the technical field of powder metallurgy, in particular to a method for preparing a copper-stainless steel in-situ composite material by vacuum consumable arc smelting. Background technique

[0002] The powder metallurgy method is to mix copper powder and stainless steel powder, and then pressure sintering to prepare copper and stainless steel in-situ composite materials. The alloy prepared by this method has low density and low hardness, which seriously restricts its development. The material and stainless steel are put into an induction melting furnace for melting, and then rapidly cooled to prepare a copper-stainless steel in-situ composite material. The material prepared by this method is prone to segregation. In addition, the mold used in the melting process will produce outgassing, resulting in high gas content in the final material. , During the smelting process, the melt scouring the crucible will also bring in some imp...

Examples

Embodiment 1

[0042] A method for preparing copper and stainless steel in-situ composite materials by vacuum consumable arc smelting, comprising the following steps:

[0043] S1. Raw material ratio:

[0044] The material composition and its weight percentage are: electrolytic copper powder 2wt%, gas atomized stainless steel powder 98wt%; copper content of electrolytic copper powder reaches 99.8%, particle size is -200-300 mesh;

[0045] The preparation method of electrolytic copper powder is as follows: palladium sheet is used as anode, palladium needle is used as cathode, and anode current density is 2000A / m 2 , the cathode current density is 1200A / m 2 , the mixed solution composed of copper sulfate and sulfuric acid is used as the electrolyte, the electrolysis temperature is 35 ° C, the concentration of copper ions in the electrolyte is 5g / L, the alternating current is used for electrolysis, and the obtained electrolytic copper powder and the containing electrolyte are mixed. Liquid fil...

Embodiment 2

[0058] A method for preparing copper and stainless steel in-situ composite materials by vacuum consumable arc smelting, comprising the following steps:

[0059] S1. Raw material ratio:

[0060] The material composition and its weight percentage are: electrolytic copper powder 50wt%, gas atomized stainless steel powder 50wt%; copper content of electrolytic copper powder reaches 99.8%, particle size is -200-300 mesh;

[0061] The preparation method of electrolytic copper powder is as follows: palladium sheet is used as anode, palladium needle is used as cathode, and anode current density is 2800A / m 2 , the cathode current density is 1350A / m 2 , using the mixed solution composed of copper sulfate and sulfuric acid as the electrolyte, the electrolysis temperature is 45 ° C, the concentration of copper ions in the electrolyte is 6g / L, the alternating current is used for electrolysis, and the obtained electrolytic copper powder and the containing electrolyte are mixed. Liquid filt...

Embodiment 3

[0074] A method for preparing copper and stainless steel in-situ composite materials by vacuum consumable arc smelting, comprising the following steps:

[0075] S1. Raw material ratio:

[0076] The material composition and its weight percentage are: electrolytic copper powder 98wt%, gas atomized stainless steel powder 2wt%; copper content of electrolytic copper powder reaches 99.8%, particle size is -200-300 mesh;

[0077] The preparation method of electrolytic copper powder is as follows: palladium sheet is used as anode, palladium needle is used as cathode, and anode current density is 3500A / m 2 , the cathode current density is 1500A / m 2 , the mixed solution composed of copper sulfate and sulfuric acid is used as the electrolyte, the electrolysis temperature is 60 ° C, the concentration of copper ions in the electrolyte is 7g / L, the alternating current is used for electrolysis, and the obtained electrolytic copper powder and the containing electrolyte are mixed. Liquid fil...

Images