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A low-temperature thermite solder for welding metals and ceramics

A technology of welding metal and aluminothermic welding, applied in aluminothermic welding equipment, welding/cutting medium/material, welding medium, etc., to achieve good welding effect

Inactive Publication Date: 2014-10-08
王翔东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Of which aluminum and Fe 2 o 3 The most representative, it has been successfully applied to the connection construction of materials such as seamless steel rails, but there is no relevant report on its application to metal and ceramic welding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of low-temperature thermite solder used for welding metals and ceramics, made of 40g aluminum powder, 100g Fe 2 o 3 powder and 1 g KMnO 4 powder composition.

[0018] How to use this solder for welding: Grind and clean the surface of the carbon steel plate and corundum ceramic plate, spread the prepared solder evenly on the surface of the carbon steel plate placed horizontally, surround it with graphite or refractory cotton, and pre-set two ignition rods Magnesium strips, sprinkle a little KClO around the magnesium strips 3 Put the corundum ceramic plate on the solder, place an iron block on it to apply appropriate pressure, and ignite the magnesium strip with an alcohol lamp to realize automatic welding. After testing, the tensile strength at room temperature after welding is 617 MPa, and the four-point bending strength is 520 MPa; the four-point bending strength at 700°C is 172 MPa.

Embodiment 2

[0020] A kind of low-temperature thermite solder used for welding metals and ceramics, made of 40g of aluminum powder passing through 100 meshes after grinding, Fe 2 o 3 powder 100g, metal silicon powder 1 g, CaF 2 Powder 0.5 g, α-Al 2 o 3 Powder 5g and KMnO 4 Powder 1 g composition.

[0021] Refer to Example 1 for the soldering method of the solder. After testing, the tensile strength at room temperature after welding is 635 MPa, and the four-point bending strength is 531 MPa; the four-point bending strength at 700°C is 191 MPa.

Embodiment 3

[0023] A low-temperature aluminothermic solder for welding metals and ceramics, made of 40g aluminum powder, 95g Fe 3 o 4 Powder, 3g Cr 2 o 3 Powder, 2g MoO 3 powder, 5 g metal magnesium powder, 1 g metal silicon powder (elemental silicon is also called metal silicon, the same below), 0.5 g CaF 2 Powder and Ca(ClO) 2 Powder 1 g composition.

[0024] The welding method of the solder: polish and clean the surface of the stainless steel plate, set up and fix it with the alumina corundum ceramic plate with a fixture, surround it with graphite or refractory cotton, and fill the prepared solder evenly in the gap between the stainless steel plate and the ceramic plate , preset two magnesium strips for ignition, place a tungsten wire loop between the two magnesium strips, sprinkle a little KClO around the magnesium strips 3 Powder, tungsten wire ignites magnesium strip after energizing to realize automatic welding. After testing, the tensile strength at room temperature after w...

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Abstract

The invention relates to a low-temperature aluminothermic solder for welding metals and ceramics, which comprises aluminum powder as a basic material, and also contains a strong oxidizing agent and an alloying component, and the amount of the strong oxidizing agent is 0.1-5% of the mass of the aluminum powder. The mass ratio of the alloying component to the aluminum powder is 1.5-3.5:1. The strong oxidizing agent is one or a mixture of two or more of KClO3, Ca(ClO)2 and KMnO4. The alloying component is composed of a main material and an auxiliary material, and the content of the auxiliary material is not higher than 20% of the mass of the main material; the main material is selected from oxides of metals homogeneous to the metal material to be welded, and the auxiliary material is metal Fe , any combination of oxides of Cr, Mn, Cu, V, Ni, Ti, Mo, Sn and Zn; the low-temperature aluminothermic solder contains α-Al2O3 not exceeding 35% of the mass of aluminum powder. The solder can realize low-temperature tight compound welding between metals of different materials and ceramics, and the welding effect is good.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a low-temperature aluminothermic solder used for welding metal and ceramics, which is suitable for composite processing between metals and ceramics or refractory materials. Background technique [0002] Metals and ceramics are two commonly used structural materials, each with its own advantages and disadvantages. Ceramic materials usually have performance characteristics such as high temperature resistance, wear resistance and chemical corrosion resistance, but have poor toughness, are easily broken, and are not impact resistant. The properties of metals are just the opposite. Therefore, using a suitable method to combine the two together to form a metal-ceramic composite material can give full play to the advantages of both and meet more engineering needs. At present, metal-ceramic composite materials are widely used in the fields of aviation, aerospace, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/34B23K23/00
Inventor 王翔东王向旭王瑞瀚苗永霞薛国林王庆鹏
Owner 王翔东
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