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Method for preparing wolfram steel or composite material of tungsten and silver

A preparation process and composite material technology, which is applied in the field of preparation technology of tungsten-copper or tungsten-silver composite materials, can solve the problems of hard phase-tungsten, such as poor particle roundness, high inclusion content, difficult distribution, etc. , to achieve the effect of reducing the arc erosion rate, weakening the splash, and avoiding the inhomogeneity of the structure

Inactive Publication Date: 2007-12-26
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two methods are all realized by the method of powder making sintering and solidification, so there are the following defects: (1) the powder making process is difficult to avoid the pollution of metal Cu, Ag and W powder, such as oxygen, nitrogen, inclusion content High; (2) Due to the method of pressing and sintering, it is difficult to avoid a certain number of holes in the product, that is, the density is low, and the vacuum degree of the product is easily damaged during use; (3) As a hard phase - tungsten The roundness of the particles is poor, and its distribution is difficult to achieve high uniformity

Method used

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  • Method for preparing wolfram steel or composite material of tungsten and silver
  • Method for preparing wolfram steel or composite material of tungsten and silver
  • Method for preparing wolfram steel or composite material of tungsten and silver

Examples

Experimental program
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Effect test

Embodiment 1

[0044] See Figure 2 for the process of preparing Cu40W60 cathode material contacts.

[0045] (1) Select tungsten wire with a diameter of 100-120μm, and pickling and cleaning, assuming d w =100μm, the prepared sample size is 4cm×4cm×3cm, and the required tungsten wire is calculated by formula ① to be 85×10 3 root, braiding a two-dimensional mesh (as shown in Figure 1); the copper wire needs very little, and is mainly used to induce copper liquid during auxiliary weaving and infiltration;

[0046] (2) According to the size required by the working conditions, cut the tungsten copper mesh into 4cm×3cm mesh;

[0047] (3) Stack, press and bundle the cut mesh pieces;

[0048] (4) Place the preform vertically in a vacuum furnace, place a copper ingot above it, and control the vacuum degree in the furnace to 1×10 -4Pa, then heat, the infiltration temperature is 1250°C, and the holding time is 3 hours, so that the molten copper fully penetrates into the gap between the tungsten wires...

Embodiment 2

[0052] See Figure 2 for the process of preparing Cu30W70 cathode material contacts.

[0053] (1) Select a tungsten wire with a diameter of 80-100 μm, and pickle and clean it, assuming d w =100μm, the prepared sample is 4cm×4cm×3cm, and the required tungsten wire is calculated by formula ① to be 106×10 3 root, braiding a two-dimensional mesh (as shown in Figure 1); the copper wire needs very little, and is mainly used to induce copper liquid during auxiliary weaving and infiltration;

[0054] (2) According to the size required by the working conditions, cut the tungsten copper mesh into 4cm×3cm mesh;

[0055] (3) Stack, press and bundle the cut mesh pieces;

[0056] (4) Place the preform vertically in a vacuum furnace, place a copper ingot above it, and control the vacuum degree in the furnace to 1×10 -4 Pa, then heat, the infiltration temperature is 1350°C, and the holding time is 3.5 hours, so that the molten copper fully penetrates into the gap between the tungsten wires;...

Embodiment 3

[0060] See Figure 2 for the process of preparing Ag40W60 cathode material contacts.

[0061] (1) Select tungsten wire with a diameter of 100-120μm, and pickling and cleaning, assuming d w =100μm, the prepared sample is 4cm×4cm×3cm, and the tungsten wire required by formula ① is 92×10 3 root, weave a two-dimensional net (as shown in Figure 1); the silver wire needs very little, and is mainly used to induce silver liquid during auxiliary weaving and infiltration;

[0062] (2) According to the size required by the working conditions, cut the tungsten silver mesh into a length of 4cm×3cm;

[0063] (3) Stack, press and bundle the cut mesh pieces

[0064] (4) Place the preform vertically in a vacuum furnace, place silver ingots above it, and control the vacuum degree in the furnace to 1.5×10 -4 Above Pa, then heat, the heating rate is 3-10°C / min, the infiltration temperature is 1150°C, and the holding time is 2 hours, so that the melted silver liquid can fully penetrate into the ...

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Abstract

This invention discloses a process for preparing W-Cu or W-Ag composite material. The method comprises: (1) selecting W wires, washing with acid, and cleaning; (2) using Cu wires or Ag wires as the weft threads and W wires as the warp threads, and performing two-dimensional weaving to obtain a net; (3) tailoring the net into sheets according to the requirement, laminating and packing; (4) placing Cu ingot or Ag ingot above the packed sheets, and infiltrating in a vacuum sintering furnace; (5) cooling to room temperature, and taking out to obtain W-Cu or W-Ag composite cathode bar; (6) performing mechanical processing to obtain W-Cu or W-Ag composite material. The W-Cu or W-Ag composite material has such advantages as low oxygen, nitrogen and inclusion contents, and high compactness.

Description

technical field [0001] The invention relates to a preparation process of a composite material, in particular to a preparation process of a tungsten-copper or tungsten-silver composite material. Background technique [0002] Tungsten-copper composite material is a pseudo-alloy formed by uniform mixing of two immiscible tungsten and copper phases. It has both the intrinsic physical properties of tungsten and copper materials. Since tungsten has a high melting point, high density, low expansion coefficient and high strength, copper has good electrical and thermal conductivity. It has good arc erosion resistance, welding resistance, high strength, good thermal conductivity and electrical conductivity, and has been widely used. It is widely used in power electronics, cathode materials in the field of medium and high voltage electrical appliances, electrode materials for resistance welding, plasma heating in EDM, and other fields, such as ray targets, high specific gravity alloys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/00C22C45/10H01B13/00
Inventor 许云华史毅敏
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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