Liquid-phase sintering method for preparing high-melting-point hard material particle dispersion-strengthened copper-based composite material and electromagnetic sintering device

Abstract

The invention discloses a liquid-phase sintering method for preparing high-melting-point hard material particle dispersion-strengthened copper-based composite materials, which comprises the preparation of mixed powder, the preparation of copper-based composite material preforms, liquid-phase sintering and densification under a constant magnetic field. The high-strength copper-based composite billet cooling consists of four main steps. The liquid-phase sintering is used to obtain the highest strength and density of the copper-based composite material. At the same time, a constant magnetic field is used to enhance the viscosity of the copper melt in the liquid-phase sintering. The Lorentz force suppresses the movement of high-melting-point hard material particles in copper liquid, prevents the agglomeration and delamination of high-melting-point hard material particles, and thus prepares high-strength and high-conductivity copper alloy blanks with better mechanical properties and electrical conductivity Ingot, the present invention also provides a high-strength and high-conductivity copper alloy sintering device, including a heating and heat preservation device, an atmosphere control device and a constant magnetic field generating device, which can realize the technical goal of both high strength and high conductivity of copper-based composite materials, and realize Huge industrial application value.

Description

technical field

[0001] The invention relates to a metal-based composite material preparation process and equipment, in particular to a copper-based composite material powder metallurgy preparation method and a sintering device. Background technique

[0002] Copper and its alloys are one of the most important functional and structural materials in national economic construction. Their excellent electrical conductivity and corrosion resistance make them widely used in communication, electric power, aerospace, transportation, home furnishing, automation and many other fields. However, the conductivity and strength of copper alloys are a pair of contradictory properties. To improve the strength of copper alloys, it is often at the expense of the conductivity of copper alloys. For example, alloys such as copper-magnesium, copper-tin, copper-chromium, and copper-iron-phosphorus, which are widely used at present, have high strength, but their electrical conductivity can only reach ...

Examples

Embodiment 1

[0027] In this example, alumina powder is used as the high melting point hard material for dispersion strengthening, and copper alloy is used to prepare copper-containing powder to make Cu-Al 2 o 3 Powder metallurgy is carried out on the prefabricated powder round billet to prepare a dense high-strength copper-based composite material billet of copper alloy dispersion-strengthened by high-melting-point hard material particles.

[0028] In this example, see figure 1 , the electromagnetic sintering device for the method of preparing high-melting-point hard material particles dispersion-strengthened copper-based composite material by liquid-phase sintering is composed of a heating and heat preservation device, an atmosphere control device and a constant magnetic field generating device 10, specifically:

[0029] The heating and heat preservation device is composed of a stainless steel furnace body 11, a crucible 5, a refractory fiber 6, a heating element 4, a temperature control...

Embodiment 2

[0034] This embodiment is basically the same as Embodiment 1, especially in that:

[0035] In this example, the copper powder and micro-alumina powder prepared in the above-mentioned Example 1 are replaced with copper powder with dispersed distribution of nano-alumina prepared by the internal oxidation method, without powder mixing, and directly pressed into a compact, and then the above-mentioned In the same liquid-phase sintering process as in Example 1, the magnetic induction intensity is controlled to 16T, the liquid-phase sintering temperature is 1100°C, and the temperature is kept at 10 hours, then a high-strength and high-conductivity copper alloy billet with nano-alumina dispersion strengthening can also be prepared. Then, various nano-alumina dispersion-strengthened copper alloy rods, pipes, plates or wires can be prepared by conventional rolling and drawing processes, and have excellent strength and electrical conductivity.

technical field

[0001] The invention relates to a metal-based composite material preparation process and equipment, in particular to a copper-based composite material powder metallurgy preparation method and a sintering device. Background technique

[0002] Copper and its alloys are one of the most important functional and structural materials in national economic construction. Their excellent electrical conductivity and corrosion resistance make them widely used in communication, electric power, aerospace, transportation, home furnishing, automation and many other fields. However, the conductivity and strength of copper alloys are a pair of contradictory properties. To improve the strength of copper alloys, it is often at the expense of the conductivity of copper alloys. For example, alloys such as copper-magnesium, copper-tin, copper-chromium, and copper-iron-phosphorus, which are widely used at present, have high strength, but their electrical conductivity can only reach ...

Examples

Embodiment 1

[0027] In this example, alumina powder is used as the high melting point hard material for dispersion strengthening, and copper alloy is used to prepare copper-containing powder to make Cu-Al 2 o 3 Powder metallurgy is carried out on the prefabricated powder round billet to prepare a dense high-strength copper-based composite material billet of copper alloy dispersion-strengthened by high-melting-point hard material particles.

[0028] In this example, see figure 1 , the electromagnetic sintering device for the method of preparing high-melting-point hard material particles dispersion-strengthened copper-based composite material by liquid-phase sintering is composed of a heating and heat preservation device, an atmosphere control device and a constant magnetic field generating device 10, specifically:

[0029] The heating and heat preservation device is composed of a stainless steel furnace body 11, a crucible 5, a refractory fiber 6, a heating element 4, a temperature control...

Embodiment 2

[0034] This embodiment is basically the same as Embodiment 1, especially in that:

[0035] In this example, the copper powder and micro-alumina powder prepared in the above-mentioned Example 1 are replaced with copper powder with dispersed distribution of nano-alumina prepared by the internal oxidation method, without powder mixing, and directly pressed into a compact, and then the above-mentioned In the same liquid-phase sintering process as in Example 1, the magnetic induction intensity is controlled to 16T, the liquid-phase sintering temperature is 1100°C, and the temperature is kept at 10 hours, then a high-strength and high-conductivity copper alloy billet with nano-alumina dispersion strengthening can also be prepared. Then, various nano-alumina dispersion-strengthened copper alloy rods, pipes, plates or wires can be prepared by conventional rolling and drawing processes, and have excellent strength and electrical conductivity.

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