Method for preparing pure titanium miniature parts on basis of multi-physical-field activated sintering

A technology of activated sintering and multi-physics, which is applied to other manufacturing equipment/tools, mechanical equipment, engine components, etc., can solve the problems of long preparation cycle, complicated process, environmental pollution, etc., shorten the preparation cycle, simplify the process flow, The effect of improving product quality

Inactive Publication Date: 2013-12-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to address the present situation that there are few reports on the preparation method of titanium micro parts; and the present situation of the preparation of titanium and titanium alloy products, such as complicated procedures, long preparation cycle, high molding temperature, low product qualification rate, and dependence of raw materials on additives As a result, the purity of the product is not high, causing certain pollution to the environment and other defects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The powder mass is calculated according to the size of the titanium micro-gear (pitch circle diameter is 1.6mm, the number of teeth is 8, and the thickness is 3mm) and the theoretical density of the corresponding powder. After weighing the titanium powder, put it into the mold and fix it with a chuck. Under the vacuum condition of ≤0.01Pa, control the heating rate to 25°C / s, and simultaneously apply a force of 100MPa to both ends of the mold. When the temperature reaches 1200°C, keep it warm for 0 min, the powder is formed in the mold and compacted, and finally the power is turned off and air-cooled to take out the parts. The relative density of the prepared part is 97.90%, and the Vickers hardness is 189HV.

Embodiment 2

[0030] The powder mass is calculated according to the size of the titanium micro-gear (pitch circle diameter is 1.6mm, the number of teeth is 8, and the thickness is 3mm) and the theoretical density of the corresponding powder. After weighing the titanium powder, put it into the mold and fix it with a chuck. Under the vacuum condition of ≤0.01Pa, control the heating rate to 50°C / s, and simultaneously apply a force of 100MPa to both ends of the mold. When the temperature reaches 1200°C, keep it warm for 0 min, the powder is formed in the mold and compacted, and finally the power is turned off and air-cooled to take out the parts. The relative density of the prepared part is 98.60%, and the Vickers hardness is 196HV.

Embodiment 3

[0032] The powder mass is calculated according to the size of the titanium micro-gear (pitch circle diameter is 1.6mm, the number of teeth is 8, and the thickness is 3mm) and the theoretical density of the corresponding powder. After weighing the titanium powder, put it into the mold and fix it with a chuck. Under the vacuum condition of ≤0.01Pa, control the heating rate to 75°C / s, and simultaneously apply a force of 100MPa to both ends of the mold. When the temperature reaches 1200°C, keep it warm for 0 min, the powder is formed in the mold and compacted, and finally the power is turned off and air-cooled to take out the parts. The relative density of the prepared part is 98.80%, and the Vickers hardness is 198HV.

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Abstract

The invention discloses a method for preparing pure titanium miniature parts on the basis of multi-physical-field activated sintering. According to the method, pure titanium powder is weighed and is then filled into a mold, then, alternating current is introduced into the mold containing the titanium powder for carrying out fast heating under the sintering conditions that the temperature rise speed is 25 to 125 DEG C/s, and the vacuum degree is smaller than or equal to 0.01Pa, meanwhile, the acting force being 10 to 200MPa is exerted to the two ends of the mold, under the continuous effect of an electric field and a force field, the heat insulation is carried out for 0 to 10 minutes when the mold is heated to 800 to 1200 DEG C so that the titanium powder is formed in the mold, finally, the power is cut off, and the parts are cooled in the air and are then taken out. The method has the advantages that the technical flow process is simplified, the forming process can be easily controlled, no pollution is caused in the sintering process, the sintering time is shortened, the sintering temperature is lowered, and the product quality is improved.

Description

technical field [0001] The invention relates to a method for preparing pure titanium miniature parts based on multi-physics field activation sintering, and belongs to the technical field of rapid sintering preparation of pure titanium miniature parts. Background technique [0002] In the late 1980s, the international machinery manufacturing industry set off a technological revolution, that is, products were developing towards miniaturization. The rapid increase in demand for micro-products makes micro-forming technology have broad application prospects in bioscience, information, aerospace, national defense, industry, agriculture, transportation, new energy, and households. Titanium has the advantages of high specific strength, corrosion resistance, non-magnetic, superconducting, shape memory, and good biocompatibility. It is known as "space metal", "ocean metal" and "smart metal", and is especially suitable as a structural material and Special materials are used. In the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/14B22F5/00
Inventor 杨屹杨刚黄坤兰尹德强
Owner SICHUAN UNIV
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