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Sintering method for titanium or titanium alloy powder

A sintering method and technology of titanium alloy powder, applied in the field of materials, can solve the problems of slow heating rate, hindering electron migration of titanium powder, and difficult control of product size

Inactive Publication Date: 2020-07-07
王伟东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation technology of porous titanium, because there is a dense titanium dioxide oxide film on the surface of titanium powder, which hinders the electron migration between the titanium powders in contact with each other, so that it cannot be sintered by rapid heating by electromagnetic field, and can only conduct heat to the powder through the above heating elements. The body is sintered under vacuum conditions, the heating rate is slow, and the heating time is long, resulting in a large shrinkage of the size of the sintered body, and the product size is difficult to control, which is not suitable for the preparation of porous titanium and titanium alloys with high porosity

Method used

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  • Sintering method for titanium or titanium alloy powder
  • Sintering method for titanium or titanium alloy powder
  • Sintering method for titanium or titanium alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for sintering titanium powder, comprising the steps of:

[0027] Step 1: Mix pure titanium powder with a particle size of less than 45 μm and urea particles with a particle size of less than 70 μm in a volume ratio of 3:7, put 100 grams of the mixture into a mold and cold press it under a pressure of 100 MPa to form a raw material with a diameter of 30 mm. Embryos, the green embryos will be under vacuum conditions, the vacuum degree is lower than 10 -2 Pa, perform degreasing treatment to remove urea to obtain powder, the degreasing temperature is 350°C, the heating rate is 10°C / min, and the degreasing time is 2h.

[0028] Step 2: Put the powder on the silicon carbide heating body, heat the silicon carbide heating body under vacuum condition, the surface temperature of the silicon carbide heating body reaches 1000°C, and the heating rate is 500°C / min.

[0029] Step 3: Heat the powder to 1000°C with a pulse current and keep it warm for 5 minutes to prepare porou...

Embodiment 2

[0031] A method for sintering titanium alloy powder, comprising the steps of:

[0032] Step 1: Spread the spherical Ti-6Al-4V titanium alloy powder with a particle size of less than 149 μm on the silicon nitride heating body, place it in an induction heating coil, and heat it under an argon protective atmosphere with an oxygen content of less than 100 ppm The silicon nitride heating body, the surface temperature of the silicon nitride heating body reaches 900°C, and the heating rate is 450°C / min.

[0033] Step 3: Pass the induced current, heat the powder to 900°C through the alternating electromagnetic field inside the induction coil, and keep it warm for 10 minutes to prepare porous titanium. The metallographic structure of the porous titanium cross section is as follows: figure 2 ; Porous titanium has a porosity of 32% and a through-porosity of 100%.

Embodiment 3

[0035] A method for sintering titanium alloy powder, comprising the steps of:

[0036] Step 1: Polypropylene, polyethylene glycol and carnauba wax are mixed in a mass ratio of 25:70:5 and heated to 150°C to prepare a binder evenly, and the binder and spherical Ti- Mix 6Al-4V titanium alloy powder, heat to 150°C and mix evenly, pass through an injection molding machine, heat the mixture to 150°C for injection molding to obtain a green embryo with a diameter of 20 mm, and place the green embryo under vacuum conditions, the vacuum degree is lower than 10 -2 Pa, heated to 900°C for 1 hour and degreasing treatment to remove the binder to obtain a powder with a heating rate of 10°C / min.

[0037] Step 2: Put the powder on a graphite heating body with a diameter of 40 mm. Under an argon protective atmosphere, the oxygen content is lower than 100 ppm, and the graphite heating body is heated. The surface temperature of the graphite heating body reaches 1000 ° C, and the heating rate is ...

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Abstract

The invention belongs to the field of materials, and particularly relates to a sintering method for titanium or titanium alloy powder. According to the technical solution, the sintering method for thetitanium or titanium alloy powder comprises the following steps of (1) preparation of powder; (2) heating the powder by means of a heating body; and (3) heating the powder by means of an electromagnetic field. According to the sintering method for the titanium or titanium alloy powder, the heating body transmits heat to the titanium or titanium alloy powder in contact with the heating body, a non-conducting titanium dioxide oxide layer on the surface of the titanium or titanium alloy powder in a contact layer is destroyed and dissolved to realize connection and electrical conduction of the titanium or titanium alloy powder, rapid heating of the powder is realized layer by layer under the effect of the electromagnetic field, and a complete sintered body is obtained finally. According to the sintering method, the heating speed is high, the sintering time is short, the size of the sintered body is reduced, the process is simple, and the sintering method can be used for preparing porous titanium or titanium alloy with different porosities and compact titanium or titanium alloy sintered bodies.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a sintering method of titanium or titanium alloy powder. Background technique [0002] Porous material is a kind of structure-function integrated material. Due to the existence of pores, the specific surface of the material is increased and the density of the material is reduced, so that the porous material has functional properties such as adsorption, filtration, noise reduction, and heat insulation. Its products are widely used in the fields of aerospace, medicine, environmental protection, metallurgy and electrochemistry. The existing technology for preparing porous materials has complex processes, long production cycle, high technical requirements and high cost of production equipment, making it difficult to realize. [0003] Titanium and titanium alloys have been widely used as structural materials in aerospace, automobiles, diving, and medical implants due to their hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/11B22F3/105C23C24/08
CPCB22F3/1121B22F3/1134B22F3/105C23C24/085C23C24/087B22F3/1021B22F3/1007B22F2003/1051B22F2003/1053B22F2003/1054B22F1/103B22F1/142B22F1/10
Inventor 王伟东
Owner 王伟东