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Method for preparing TC4 titanium alloy parts through powder injection molding

A powder injection molding, titanium alloy technology, applied in the field of titanium alloy parts processing, can solve the problems of restricted application, poor plasticity, high impurity content, and achieve the effects of being beneficial to mass production, low cost, and high production accuracy

Active Publication Date: 2020-04-03
沈阳中钛装备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current powder injection molding TC4 titanium alloy products have defects such as high impurity content and poor plasticity, which restrict the application of this material and technology.

Method used

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  • Method for preparing TC4 titanium alloy parts through powder injection molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present embodiment provides a kind of manufacture method of TC4 titanium alloy tensile rod, specifically comprises the following steps:

[0029] Step 1: First mix polyethylene glycol (PEG), polymethyl methacrylate (PMMA), and stearic acid (SA) in a volume ratio of 70:28:2 to make a binder, and then set the D90 to 0.045mm The TC4 titanium alloy powder and the binder are put into the internal mixer at a volume ratio of 65:35 and filled with argon, mixed at 170°C for 2 hours at a speed of 40r / min and granulated to make a feed;

[0030] Step 2: Use the injection molding machine to inject the above-mentioned feed materials into the mold to make a stretch rod blank. The injection parameters are: the mold temperature is 40°C, and the temperatures in the 1, 2, 3, and 4 areas of the injection molding machine are respectively 160°C, 175°C, 180°C, 185°C, nozzle temperature 190°C, injection pressure 1500bar, holding pressure 1000bar, cooling time 6s;

[0031] Step 3: Immerse t...

Embodiment 2

[0037] Example 2 The same method as in Example 1 was used to prepare TC4 titanium alloy tensile rods, the only difference being that in Step 5 of Example 2, under a vacuum with an air pressure of 30KPa, the thermally degreased billet was cooled to 500°C with furnace cooling and kept 10 minutes

[0038] The mechanical properties of the TC4 titanium alloy tensile rod produced in Example 2 were tested, and the results showed that the density was 97%, the tensile strength was 932Mpa, the yield strength was 870Mpa, and the elongation was 10%.

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Abstract

The invention provides a method for preparing TC4 titanium alloy parts through powder injection molding. The method comprises the following steps of S1, conducting mixing and pelletizing on TC4 titanium alloy powder and a bonding agent to obtain feed; S2, conducting injection molding on the feed to obtain blanks; S3, immersing the blanks into deoxidized distilled water or ethyl alcohol for solventdegreasing to obtain solvent degreased blanks; S4, feeding the solvent degreased blanks into a sintering furnace, covering the upper portion of the sintering furnace with a cover body to maintain inert gas circulation in the sintering furnace, and conducting thermal degreasing at 500-700 DEG C to obtain thermal degreased blanks; S5, shutting off inert gas circulation, cooling the thermal degreased blanks to 400-500 DEG C under a certain vacuum degree and maintaining the temperature for 10-60 min; and S6, conducting sintering on the thermal degreased blanks treated in the step S5 to obtain finished products. Through the method for preparing the TC4 titanium alloy parts, foreign gas residues at a sintering section can be effectively controlled, and the mechanical performance of TC4 titaniumalloy products is improved.

Description

technical field [0001] The invention relates to the technical field of processing titanium alloy parts, in particular to a method for preparing TC4 titanium alloy parts by powder injection molding. Background technique [0002] TC4 belongs to (α+β) duplex titanium alloy, which has a series of advantages such as light specific gravity, strong corrosion resistance, good biocompatibility, high specific strength and good toughness. It is widely used in aerospace, petrochemical, shipbuilding, automobile, medical And other fields have a wide range of applications, but TC4 titanium alloy has poor machinability, chip processing is difficult, and the cost is expensive. [0003] Powder injection molding technology is a near-net-shape manufacturing technology. In the manufacture of complex parts, it has the characteristics of high precision, high productivity, and low cost. Applicable materials include metal materials, ceramics, etc. Therefore, it is of great significance to use powde...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F3/10B22F1/00
CPCB22F3/225B22F3/1025B22F1/103B22F1/102
Inventor 孙宏伟李雪辰郭方慧
Owner 沈阳中钛装备制造有限公司
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