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Precision titanium part manufacturing method

A part and precision technology, applied in the field of precision preparation of titanium parts, can solve the problems of high production cost and low production efficiency of titanium parts, and achieve the effects of increasing powder loading, preventing oxidation and uniform structure.

Active Publication Date: 2016-03-09
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low production efficiency and high production cost of titanium parts prepared by traditional production methods, and provide a precision preparation method for titanium parts, which can directly prepare titanium parts with final shape and high dimensional accuracy at lower production costs. titanium parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare the titanium powder that average particle size is respectively 46.82, 34.48 and 24.36 μ m by weight ratio 68:24:8, mixes 12 hours on V-shaped mixer;

[0019] Mix POM, HDPE, EVA, SA and PW by weight 86:5:5:2:2, add to the torque rheometer, mix for 1 hour at 175°C to make binder granules;

[0020] Add the binder granules into the mixer, according to the titanium powder: binder granule weight ratio of 56:48, at 195°C, add the titanium powder into the binder granules three times at intervals of five minutes, until the powder is completely After adding, lower the temperature to 175°C and knead for 1 hour, and get the feed after cooling;

[0021] The feed material is injected into a green titanium part at an injection temperature of 175°C, an injection pressure of 80MPa, a holding pressure of 85MPa, an injection speed of 65mm / S, and a cooling time of 10S;

[0022] Degrease the green body of the titanium parts at a temperature of 120°C, a nitric acid feed rate of 1.5m...

Embodiment 2

[0025] Titanium powder and binder particles are the same as in Example 1.

[0026] Add the binder granules into the mixer, according to the titanium powder: binder granule weight ratio of 56:48, at 195°C, add the titanium powder into the binder granules three times at intervals of five minutes, until the powder is completely After adding, lower the temperature to 180°C and knead for 1 hour, and get the feed after cooling;

[0027] The feed material is injected into a green body of titanium parts at an injection temperature of 180°C, an injection pressure of 70MPa, a holding pressure of 80MPa, an injection speed of 65mm / S, and a cooling time of 10S;

[0028] Degrease the green body of the titanium parts at a temperature of 120°C, a nitric acid feed rate of 1.5ml / min, and a nitrogen gas feed rate of 120ml / min;

[0029] Finally, the green body of the degreased titanium parts is heated at a heating rate of 4°C / min, a temperature of 1220°C, a time of 90min, and a vacuum of 1x10 -...

Embodiment 3

[0031] Titanium powder and binder particles are the same as in Example 1.

[0032] Add the binder granules into the mixer, according to the titanium powder: binder granule weight ratio of 56:48, at 190°C, add the titanium powder into the binder granules three times at intervals of five minutes, until the powder is completely After adding, lower the temperature to 175°C and knead for 1 hour, and get the feed after cooling;

[0033] The feed material is injected into a green titanium part at an injection temperature of 175°C, an injection pressure of 75MPa, a holding pressure of 85MPa, an injection speed of 60mm / S, and a cooling time of 10S;

[0034] Degrease the green body of the titanium parts at a temperature of 110°C, a nitric acid feed rate of 1.5ml / min, and a nitrogen feed rate of 120ml / min;

[0035] Finally, the green body of the degreased titanium part is heated at a heating rate of 4°C / min, a temperature of 1250°C, a time of 90min, and a vacuum of 1x10 -3 Pa, sintered...

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Abstract

The invention provides a precision titanium part manufacturing method. The method includes the following steps that titanium powder with the average particle size being 46.82 micrometers, titanium powder with the average particle size being 34.48 micrometers, and titanium powder with the average particle size being 24.36 micrometers are evenly mixed; the titanium powder is added to binder particles to be mixed for 1 hour at the temperature of 175 DEG C to 180 DEG C, and feed is obtained after the mixture is cooled; the feed is injected into forming titanium part green bodies under the conditions that the injection temperature ranges from 175 DEG C to 180 DEG C, the injection pressure ranges from 70 MPa to 80 MPa, the dwell pressure ranges from 80 MPa to 85 MPa, the injection speed ranges from 60 mm / S to 65 mm / S and the cooling time is 10 S; the titanium part green bodies are degreased under the conditions that the temperature ranges from 110 DEG C to 130 DEG C, the nitric acid flow rate is 1.5 ml / min, and the nitrogen flow rate is 120 ml / min; and the degreased titanium part green bodies are sintered to form titanium parts under the conditions that the temperature rising speed is 4 DEG C / min, the temperature ranges from 1200 DEG C to 1280 DEG C, the time is 90 min and the vacuum degree is 1*10<-3> Pa. By means of the precision titanium part manufacturing method, the titanium parts in the final shape with high size precision can be manufactured directly with the low production cost.

Description

technical field [0001] The invention belongs to the field of precision manufacturing and relates to a precision preparation method of titanium parts. Background technique [0002] Titanium has low density, high specific strength, strong heat resistance and good biocompatibility, and its density is 4.51g / cm 3 , equivalent to 57% of steel, is widely used in medicine, sports, petrochemical, aerospace, metallurgy and light industry and other fields. However, titanium is an active metal, which is very easy to oxidize and react with other substances to form compounds at higher temperatures, which seriously affects its processing and performance. Using traditional processing methods to prepare titanium for titanium parts is extremely expensive. Powder injection technology (PIM) is a new type of component manufacturing technology developed in recent years. It has the advantages of high precision, consistency, low cost and large-scale production in the manufacture of complex parts....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F1/00
Inventor 罗铁钢蔡一湘符乃科毛新华陈强周时宇
Owner GUANGDONG INST OF NEW MATERIALS
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