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A method for preparing miniature tungsten-based alloy parts

A technology for tungsten-based alloys and parts, applied in the field of metal injection molding, can solve the problems of excessive sintering temperature and sintering time, uneven dispersion of metal powder, easy deformation of shrinkage, etc., to improve surface properties, facilitate injection molding, feeding The effect of low mobility

Active Publication Date: 2016-08-24
KUNSHAN AT & MIK METAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of using this process to make parts, it is found that there are two problems: first, the dispersion of each metal powder is not uniform when using the common method for mixing powder, so in order to make the dispersion structure of the base phase and the dispersed phase uniform, the actual Both the sintering temperature and sintering time exceed the theoretical value; secondly, due to the surface characteristics of tungsten powder, the content of metal powder in the prepared feed is lower than 50VOI%, so the feed has strong fluidity and poor plasticity, so thin parts The injection becomes difficult, and the shrinkage is too large during sintering, it is easy to deform, and the size control becomes difficult

Method used

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  • A method for preparing miniature tungsten-based alloy parts
  • A method for preparing miniature tungsten-based alloy parts

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Experimental program
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Effect test

Embodiment 1

[0020] A method for preparing miniature tungsten-based alloy parts of the present invention comprises the following steps:

[0021] 1) Taking materials: Weighing each metal powder respectively. Wherein, each metal powder is selected as W, Fe and Ni.

[0022] 2) Composite coating: the Fe powder and Ni powder are sequentially plated on the surface of the W powder in the form of a composite coating; the W powder through the composite coating is stored for future use.

[0023] 3) Mixing: First add the binder 30PP-10PE-58PW-2SA into the internal mixer to heat and melt, first add the binder to the internal mixer to heat and melt, and then add the composite coated W powder in batches until sticky Form a mixed solution in the adhesive until the volume percentage of the W powder in the mixed solution through the composite coating is 55%; knead at a temperature of 100° C. for 2 hours.

[0024] 4) Injection molding: Install a micro-injection molding mold on an injection molding machine...

Embodiment 2

[0044] A method for preparing miniature tungsten-based alloy parts of the present invention comprises the following steps:

[0045] 1) Taking materials: Weighing each metal powder respectively. Wherein, each metal powder is selected as W, Cu and Ni.

[0046] 2) Composite coating: the Cu powder and Ni powder are sequentially plated on the surface of the W powder in the form of a composite coating; the W powder after the composite coating is stored for future use.

[0047] 3) Mixing: first add the binder 30PP-10PE-58PW-2SA into the internal mixer to heat and melt, then add the composite coated W powder to the binder in batches to form a mixed solution until the composite coated W The volume percentage of the powder in the mixed liquid is 58%; kneading at a temperature of 160° C. for 1.5 hours.

[0048] 4) Injection molding: installing a micro-injection molding mold on an injection molding machine for injection molding to obtain a micro-sized tungsten-based alloy part green bod...

Embodiment 3

[0068] A method for preparing miniature tungsten-based alloy parts of the present invention comprises the following steps:

[0069] 1) Taking materials: Weighing each metal powder respectively. Wherein, each metal powder is selected as W, Cu and Ni.

[0070] 2) Composite coating: the Cu powder and Ni powder are sequentially plated on the surface of the W powder in the form of a composite coating; the W powder after the composite coating is stored for future use.

[0071] 3) Mixing: first add the binder 30PP-10PE-58PW-2SA into the internal mixer to heat and melt, then add the composite coated W powder to the binder in batches to form a mixed solution until the composite coated W The volume percentage of the powder in the mixed liquid is 60%; kneading at a temperature of 180° C. for 1 hour.

[0072] 4) Injection molding: installing a micro-injection molding mold on an injection molding machine for injection molding to obtain a micro-sized tungsten-based alloy part green body o...

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Abstract

The invention relates to a preparation method of a tungsten-based alloy part. The purpose is to provide a method for preparing miniature tungsten-based alloy parts, which is easy to fill, has high green strength, good shape retention, low sintering temperature requirements, and dense metallographic structure of the finished product. The preparation method of a tungsten-based alloy part of the present invention includes six steps of material extraction, composite coating, kneading, injection molding, green body degreasing, and sintering, wherein the composite coating step has an important influence on the technical effect of the present invention.

Description

technical field [0001] The invention relates to a metal injection molding technology, in particular to a preparation method of a tungsten-based alloy part. Background technique [0002] Metal Injection Molding (MIM) is the fastest-growing new process in the field of powder metallurgy today, and it is also a new process for metal forming. It is called the "fifth generation" metal forming method. It has unique advantages in near-net-shape parts. [0003] Tungsten-based high-density alloys (such as W-Ni-Fe, W-Ni-Cu, etc.) with tungsten as the main raw material have high strength, high density, high red hardness, low expansion coefficient, and excellent wear resistance and corrosion resistance Due to its unique performance advantages such as sex, it has been widely used in cutting-edge scientific fields, defense industry and civilian industry. It is precisely because of the excellent properties of tungsten-based alloys that it is regarded as the preferred raw material in the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22B22F1/02C22C27/04
Inventor 纪国章林舜天何建久孟坤全陈璟文祁新亮王大伟
Owner KUNSHAN AT & MIK METAL MATERIALS CO LTD