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Preparation method for powder sintering material

A technology of sintered materials and powders, which is applied in the field of powder sintered material preparation, can solve the problems of irregular joint surface, unevenness, layer-to-layer separation, etc., and achieve the effect of increasing the bonding strength

Active Publication Date: 2018-06-01
合肥波林新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the surface of the matrix has been formed and solidified for the first time pressing, and when the surface layer mixture is pressed again, the bonding force of the joint surface will be insufficient, and the separation between layers may be formed.
The other is: first fill the matrix mixture into the mold cavity, then fill the surface layer mixture into the mold cavity, and then press it once; in this way, it is difficult to fill the mixture twice due to the thickness of the powder layer of the mixture. Uniform control will result in irregular or uneven bonding surfaces between layers

Method used

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  • Preparation method for powder sintering material

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1) Weighing the raw materials: Weigh the base and surface raw materials according to the formula requirements; Iron powder; the ratio of surface raw materials is: copper powder 2%, graphite 0.8%, molybdenum 0.5%, nickel 2.0%, spindle oil 0.08%, zinc stearate 0.7%, and the balance is atomized iron powder;

[0020] (2) Mixing process: add the matrix and surface layer raw materials into the mixer respectively, and take out after fully mixing to obtain the matrix mixture and the surface layer mixture;

[0021] (3) Pre-compression molding: First, put the matrix mixture into a pre-molding mold for compression, with a pre-pressure of 380 MPa, and press the green matrix; Press the surface layer green body; the thickness of the base body is 5mm, and the thickness of the surface layer is 2.5mm;

[0022] (4) Recompression molding: respectively put the green base body and the green surface layer into the molding die and press them into a green compact, and the recompression press...

Embodiment 2

[0025] The difference between this example and Example 1 is that the pre-pressure of the substrate is 450 MPa; the pre-pressure of the surface layer is 450 MPa, and the re-pressing pressure is 550 MPa;

Embodiment 3

[0027] The difference between this example and Example 1 is that the pre-pressure of the substrate is 500 MPa; the pre-pressure of the surface layer is 500 MPa, and the re-pressing pressure is 700 MPa;

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Abstract

The invention discloses a preparation method for a powder sintering material. The preparation method comprises the following steps that a matrix and a surface layer raw material are weighed accordingto the formulation requirement; the matrix and the surface layer raw material are added into a blender mixer to be fully mixed, anda matrix mixture and a surface layer mixture are obtained; a matrix green body is pressed and made, and then a surface layer green body is pressed and made; and the matrix green body and the surface layer green body are sequentially placed in a forming mould for beingpressing into a pressing blank, andthe pressing blank is placed into a sintering furnace for sintering to obtain the powder sintering material. According to the preparation method for the powder sintering material, the forming process is divided into pre-pressing forming and re-pressing forming, the matrix green body and the surface layer green body are pressed in the pre-forming mould by using low pre-pressure, during pre-pressing pressing, powder flows to make the surface of the green bodies become smooth, and the green bodies with the even thickness are obtained in a pressedmode; and then high pressure is used to pressing the green bodies into the pressing blank, and due to the fact that re-pressing pressure is greater than the pre-pressing pressure, during re-pressing, laminated materials can be fully compacted, and defects cannot be left inside the laminated material green bodies.

Description

technical field [0001] The invention belongs to a method for preparing powder sintered materials, in particular to a method for preparing powder metallurgy cladding materials. Background technique [0002] Powder metallurgy technology is a technology that has the characteristics of material saving, energy saving, low cost, and can be molded into parts with near-net shape and dimensional accuracy in large quantities. Its products are used in machinery, aviation, especially automobiles, motorcycles and home appliances. It has been widely used in the industry, and materials prepared by powder metallurgy technology are called powder metallurgy materials or powder sintered materials. With the progress of society and the intensification of competition among powder metallurgy product enterprises, the requirements for product performance are higher; in some occasions with high performance requirements, single-layer (overall) powder metallurgy materials can no longer meet the needs o...

Claims

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Application Information

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IPC IPC(8): B22F7/02B22F3/02B22F3/10B22F5/00
CPCB22F3/02B22F3/10B22F5/006B22F7/02B22F2998/10
Inventor 李其龙郑合静高文娟徐伟
Owner 合肥波林新材料股份有限公司
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