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A sintering and welding process for high airtight powder metallurgy parts

A powder metallurgy and welding technology, applied in welding media, welding equipment, metal processing equipment, etc., can solve the problems of not being able to fully guarantee the solder sealing pores, difficult to meet the requirements, etc., to achieve high air tightness requirements, improve air tightness , the effect of improving strength and air tightness

Active Publication Date: 2018-09-11
GUANGDONG DONGMU NEW MATERIALS
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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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  • A sintering and welding process for high airtight powder metallurgy parts
  • A sintering and welding process for high airtight powder metallurgy parts
  • A sintering and welding process for high airtight powder metallurgy parts

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Embodiment Construction

[0014] Reference figure 1 , A high-airtightness powder metallurgy parts sintering welding process, including the following steps: a, powder metallurgy forming green body 1, 2 combination, two green body 1, 2 assembly positioning, the gap between 0.1~0.4mm; b. Solder 3; c. Place the copper sheet 4 for soldering, which is placed above the solder 3; d. Enter the furnace for sintering. There are four areas in the furnace, followed by the pre-burning and dewaxing zone-temperature 580~630 degrees , Primary welding zone-temperature 950~1000 degrees, sintering and secondary welding zone-temperature 1100~1200 degrees, circulating water cooling zone; e. Cooling from furnace. First position the two green billets 1 and 2 to ensure that the welding gap is 0.1~0.4mm. Place the solder 3 and the red copper sheet 4 in the solder placement tank 201, and the red copper sheet 4 on the solder 3, and then send it to the sintering furnace. There are four areas in the furnace corresponding to four s...

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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 welding process for powder metallurgy parts with high airtightness. Background technique [0002] The general methods of powder metallurgy welding are: electric welding, brazing, laser welding, friction welding, combined sintering welding. Among them, combined sintering welding is one of the simplest and lower cost methods. Reference figure 2 , image 3 In the traditional sintering welding, two green blanks are assembled and positioned. One of the green blanks is provided with a solder placement groove for holding solder. After solder is added, it is sintered and welded at a high temperature. However, the current sintered welding of product combinations with air tightness and strength requirements fails to meet the requirements, especially the air tightness requirements. Due to the existence of pores in powder metallurgy, there are irregularities in the flow of solder during sintering, which cannot completely guarantee ...

Claims

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Application Information

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Patent Type & Authority Patents(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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