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Method for preparing pore gradient metal or alloy material by microwave sintering

A technology of microwave sintering and alloy materials, which is applied in the field of preparing pore gradient metal or alloy materials, can solve the problems that have not been reported, and achieve the effects of easy process, cost reduction and enhanced microwave absorption ability

Inactive Publication Date: 2013-11-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the use of microwave heating to directly sinter to prepare pore gradient alloy materials has not been reported so far.

Method used

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  • Method for preparing pore gradient metal or alloy material by microwave sintering
  • Method for preparing pore gradient metal or alloy material by microwave sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] ① Mill the W powder with a purity greater than 99.5% and an average particle size of 1.98 μm at a ball-to-material ratio of 1:1 and a rotational speed of 150 rpm for 6 hours in a stainless steel ball mill cylinder, take it out and press it into a compact;

[0033] ②Alumina fiber is used as the insulation body, and SiC is added as the auxiliary heating material in the insulation body. The insulation structure is shown in the figure, and the amount of SiC as the auxiliary heating material is 300g.

[0034] ③The compact is placed in the sintering cavity and placed in a microwave high-temperature furnace;

[0035] ④Use a vacuum pump to exhaust the air in the microwave oven cavity, and then inject N 2 Atmosphere protection; adjust the output power of the microwave high-temperature furnace, heat up to 1000°C at a heating rate of 5°C / min, then adjust the microwave input power to make the heating rate reach 25°C / min, and the temperature reaches 1450°C, turn off the microwave so...

Embodiment 2

[0038] ① Mix W powder with a purity greater than 99.5% and an average particle size of 1.98 μm, Cu powder with a purity greater than 99.5% and an average particle size of 9 μm, and Ni powder with a purity greater than 99.5% and an average particle size of 2.3 μm, according to the mass percentage of 95W-4Cu-1Ni, With a ball-to-material ratio of 1:1 and a rotational speed of 150rpm, ball mill in a stainless steel ball mill cylinder for 6 hours, take it out and press it into a compact;

[0039] ②Alumina fiber is used as the insulation body, and SiC is added as the auxiliary heating material in the insulation body. The insulation structure is shown in the figure, and the amount of SiC as the auxiliary heating material is 300g.

[0040] ③The compact is placed in the sintering cavity and placed in a microwave high-temperature furnace;

[0041] ④Use a vacuum pump to exhaust the air in the microwave oven cavity, and then inject N 2 Atmosphere protection; adjust the output power of th...

Embodiment 3

[0044] ① Mix W powder with a purity greater than 99.5% and an average particle size of 1.98 μm, Ni powder with a purity greater than 99.5% and an average particle size of 2.3 μm, and Fe powder with a purity greater than 99.5% and an average particle size of 2.3 μm, according to the mass percentage of 90W-7Ni-3Fe , with a ball-to-material ratio of 1:1 and a rotating speed of 150rpm, mixed in a stainless steel ball mill for 6 hours, and pressed into a compact after being taken out;

[0045]②Alumina fiber is used as the insulation body, and SiC is added as the auxiliary heating material in the insulation body. The insulation structure is shown in the figure, and the amount of SiC as the auxiliary heating material is 300g.

[0046] ③The compact is placed in the sintering cavity and placed in a microwave high-temperature furnace;

[0047] ④Use a vacuum pump to exhaust the air in the microwave oven cavity, and then inject H 2 Atmosphere protection; adjust the output power of the mi...

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Abstract

The invention relates to a method for preparing pore gradient metal or an alloy material by microwave sintering. The method comprises the following steps of: manufacturing a blank; putting the compacted blank into a heat-insulating cavity made of a heat-insulating material, wherein in the wall thickness of the heat-insulating cavity, one end is thin, and the other end is thick; and putting the compacted blank into a microwave high-temperature furnace, heating at a speed of 5 to 10 DEG C / minute to the temperature which is 0.7 time of sintering temperature Ts, then heating at a speed of 20 to 50 DEG C / minute to the sintering temperature, turning off a microwave source, and cooling with the furnace. In the method, alloy with a gradient structure is prepared by using a microwave sintering technology, and the gradient pore alloy material can be sintered in the ordinary microwave high-temperature furnace; and after the gradient pore alloy is obtained, the alloy material with gradient ingredients can be prepared by an infiltration process, and the integral process is easy to design, simple, controllable and low in cost. Compared with the conventional process, the method has the advantages that: the blank with the gradient structure is not needed to be manufactured before sintering; a gradient temperature field is formed by using a microwave selective heating technology; sintering effects of products in different areas are controlled; and a controllable gradient tissue structure is obtained. The method can be used for industrial production.

Description

Technical field: [0001] The invention relates to a method for preparing a pore gradient metal or alloy material. In particular, it refers to a method for preparing gradient pore metal or alloy material by microwave sintering technology. The invention belongs to the technical field of microwave application and pore gradient alloy preparation. Background technique [0002] The existing preparation techniques of functionally graded materials mainly include methods such as plasma spraying, electrophoretic deposition, vapor deposition, self-propagating synthesis, and laser sintering. These methods have disadvantages such as complex process, high equipment requirements, and high cost. [0003] The principle of microwave sintering technology is to convert microwave energy directly into heat energy inside the material to cause powder consolidation and alloying. It is a volume heating behavior and has the advantages of fast heating speed, short sintering cycle, low energy consumpti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08
Inventor 易健宏周承商李丽娅王嘉娄静
Owner CENT SOUTH UNIV
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