Method of preparing tungsten-molybdenum-copper composite material by large current resistance sintering

Abstract

The invention discloses a method of preparing a tungsten-molybdenum-copper composite material by large current resistance sintering. The method of preparing the tungsten-molybdenum-copper composite material by the large current resistance sintering comprises the following steps that firstly, tungsten powder, molybdenum powder and copper powder are ball-milled to be fully and evenly mixed, and thenmixed powder is put into a mould to be pressed into a blank of a cylindrical structure, the blank is put into a reaction chamber, and the tungsten-molybdenum-copper composite material is prepared ata lower temperature by a specific heat treatment process. As the method of preparing the tungsten-molybdenum-copper composite material by the large current resistance sintering aims at the problem ofpreparing tungsten-molybdenum-copper alloy by an existing infiltration method, compared with the existing infiltration method, the method can reduce the preparation temperature from 1100-1600EG C to 700-1000 DEG C, and the preparation time is shortened from 100-760 min to 4-27 min; the process of densification can be completed by the direct action of an electric field to a blank body to heat the blank body rapidly; and the process is simplified, the implement is easy, and the products with small grains and compact combination can be obtained. The disadvantages of existing sintering methods such as high sintering temperature, long sintering time, and complicated process are solved.

Description

Technical field

[0001] The invention belongs to the technical field of composite material preparation, and specifically relates to a method for preparing a tungsten, molybdenum, copper composite material sintered with high current resistance. Background technique

[0002] Both W-Cu and Mo-Cu alloys are composite materials composed of a two-phase mixed structure that neither solid solution into each other nor form intermetallic compounds. W-Cu has good arc erosion resistance, welding resistance, high strength and high hardness, etc. It is widely used in electronic and electrical, military equipment, aerospace and other new technical fields. Although Mo-Cu can greatly However, its high-temperature strength and ablation resistance are still incapable of high temperature and harsh environments, and can only be used in some applications with low temperature, such as air rudders, counterweights, connecting plates, etc. Therefore, on the basis of W-Cu alloy, part of Mo is used to repla...

Examples

Embodiment 1~20

[0029] 1. Add copper powder with a particle size of 20~30μm, tungsten powder and molybdenum powder with a particle size of 2~3μm into the high-energy planetary ball mill according to the mass ratio listed in the table, and add a little alcohol into the ball mill tank. To prevent the powder from being oxidized during the ball milling process.

[0030] 2. Put the tungsten, molybdenum, copper powder mixed by ball milling into a mold to form a green body with a cylindrical structure, and the relative density of the green body is maintained at 68% to 80%.

[0031] 3. Place the green body in the heating device, in an electric field with an output voltage of 3~10V, an output current of 4000~12000A, and a vacuum of 10 -3 Under the condition of Pa, the green body is directly energized for rapid heating, the green body is heated to 200°C and then kept for 1~5min, and then the temperature is increased to 700~1000°C at a heating rate of 10~200°C / s, and then the holding pressure is applied P (1...

Technical field

[0001] The invention belongs to the technical field of composite material preparation, and specifically relates to a method for preparing a tungsten, molybdenum, copper composite material sintered with high current resistance. Background technique

[0002] Both W-Cu and Mo-Cu alloys are composite materials composed of a two-phase mixed structure that neither solid solution into each other nor form intermetallic compounds. W-Cu has good arc erosion resistance, welding resistance, high strength and high hardness, etc. It is widely used in electronic and electrical, military equipment, aerospace and other new technical fields. Although Mo-Cu can greatly However, its high-temperature strength and ablation resistance are still incapable of high temperature and harsh environments, and can only be used in some applications with low temperature, such as air rudders, counterweights, connecting plates, etc. Therefore, on the basis of W-Cu alloy, part of Mo is used to repla...

Examples

Embodiment 1~20

[0029] 1. Add copper powder with a particle size of 20~30μm, tungsten powder and molybdenum powder with a particle size of 2~3μm into the high-energy planetary ball mill according to the mass ratio listed in the table, and add a little alcohol into the ball mill tank. To prevent the powder from being oxidized during the ball milling process.

[0030] 2. Put the tungsten, molybdenum, copper powder mixed by ball milling into a mold to form a green body with a cylindrical structure, and the relative density of the green body is maintained at 68% to 80%.

[0031] 3. Place the green body in the heating device, in an electric field with an output voltage of 3~10V, an output current of 4000~12000A, and a vacuum of 10 -3 Under the condition of Pa, the green body is directly energized for rapid heating, the green body is heated to 200°C and then kept for 1~5min, and then the temperature is increased to 700~1000°C at a heating rate of 10~200°C / s, and then the holding pressure is applied P (1...

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