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Sintering welding process of high-air-tightness powder metallurgical part

A technology of powder metallurgy and welding technology, which is applied in the direction of welding medium, welding equipment, metal processing equipment, etc. It can solve the problems that it is difficult to meet the requirements and can not completely guarantee the solder sealing pores, and achieve the requirements of improving air tightness and high air tightness , Improve the strength and airtightness effect

Active Publication Date: 2016-08-24
GUANGDONG DONGMU NEW MATERIALS
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, at present, sintering and welding of product combinations with airtightness requirements and strength requirements cannot meet the requirements, especially the airtightness requirements. Due to the porosity of powder metallurgy, the flow of solder during sintering welding is irregular, and it cannot completely guarantee that the solder is completely sealed. Pores, the airtightness requirements of general sintered welds can only meet the requirements of 1.6mpa, and it is difficult to meet the requirements for higher airtightness such as 3.5mpa

Method used

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  • Sintering welding process of high-air-tightness powder metallurgical part
  • Sintering welding process of high-air-tightness powder metallurgical part
  • Sintering welding process of high-air-tightness powder metallurgical part

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Embodiment Construction

[0014] refer to figure 1 , a sintering and welding process of powder metallurgy parts with high airtightness, comprising the following steps: a. Combining powder metallurgy formed green bodies 1 and 2, assembling and positioning the two green bodies 1 and 2, and the gap requirement is 0.1~0.4mm; b. placing Solder 3; c, place the copper sheet 4 for welding, the copper sheet 4 is placed above the solder 3; d, enter the furnace for sintering, and there are four areas in the furnace, which are pre-fired and dewaxed areas in turn-temperature 580~630 degrees , Primary welding area - temperature 950 ~ 1000 degrees, sintering and secondary welding area - temperature 1100 ~ 1200 degrees, circulating water cooling area; e, furnace cooling. First, position the two green bodies 1 and 2 to ensure that the welding gap is 0.1~0.4mm, place the solder 3 and the copper sheet 4 in the solder placement tank 201, put the copper sheet 4 on the solder 3, and then send them into the sintering furnac...

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Abstract

The invention discloses a sintering welding process of a high-air-tightness powder metallurgical part. The process comprises the following steps: a, combining powder metallurgical forming green bodies, and assembling and positioning the two green bodies, wherein a clearance between the two green bodies is 0.1 to 0.4mm according to the requirement; b, feeding welding flux; c, arranging a red copper sheet used for welding, wherein the red copper sheet is arranged on the welding flux; d, sintering through a furnace, wherein four areas are arranged in the furnace and include, in order, a pre-sintering dewaxing area which is at the temperature of 580 to 630 DEG C, a first welding area which is at the temperature of 950 to 1000 DEG C, a sintering and secondary welding area which is at the temperature of 1100 to 1200 DEG C, and a circulating water cooling area; e, moving out from the furnace, and cooling.

Description

technical field [0001] The invention relates to a sintering and welding process for high airtight powder metallurgy parts. Background technique [0002] Powder metallurgy welding methods generally include: electric welding, brazing, laser welding, friction welding, combined sintering welding. Among them, combined sintering and welding is one of the easiest and cheapest methods. refer to figure 2 , image 3 , the traditional sintering welding is assembled and positioned by two green bodies, one of which is provided with a solder placement groove for accommodating solder, and after adding solder, it is sintered and welded at a high temperature. However, at present, sintering and welding of product combinations with airtightness requirements and strength requirements cannot meet the requirements, especially the airtightness requirements. Due to the porosity of powder metallurgy, the flow of solder during sintering welding is irregular, and it cannot completely guarantee that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K35/30B23K33/00B22F3/10
CPCB22F3/10B23K1/008B23K33/00B23K35/302
Inventor 苏镇坚梁集标赵善杰
Owner GUANGDONG DONGMU NEW MATERIALS
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