A hot isostatic pressing method for preparing high-density molybdenum-copper alloy

A technology of molybdenum-copper alloy and hot isostatic pressing, which is applied in the field of materials, can solve the problems of airtightness, uneven composition distribution, and low relative density of devices that affect the thermal conductivity of materials, and achieve good thermal conductivity and uniform distribution of two phases , high densification effect

Inactive Publication Date: 2017-03-01
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of low relative density, uneven composition distribution, small sample size and other defects that affect the thermal conductivity of materials and air tightness of devices when molybdenum-copper alloys are prepared by existing methods, and provide A hot isostatic pressing method for preparing high-density molybdenum-copper alloy

Method used

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  • A hot isostatic pressing method for preparing high-density molybdenum-copper alloy
  • A hot isostatic pressing method for preparing high-density molybdenum-copper alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0040]The raw materials are weighed according to the following weight percentages: molybdenum powder 50%, copper powder 50%. Put the weighed raw materials (ie, molybdenum powder and copper powder) into a stainless steel ball mill tank for ball milling, using tungsten alloy balls for ball milling, and the ball milling time is 18 hours to obtain a mixed powder. The obtained mixed powder was put into a soft mold for cold isostatic pressing, the cold isostatic pressing pressure was 240 MPa, the temperature was 18°C, and the time was 10 minutes to obtain a cold compact. Take out the cold compact from the soft film, carry out hydrogen reduction, and complete the pre-sintering process at the same time. The hydrogen reduction process is as follows: heat preservation at 280°C for 1h, and heat preservation at 700°C for 0.5h. Put the reduced compact into a metal sheath, heat and degas it, and seal it in a vacuum sheath. Put it in the hot isostatic pressing equipment for hot isostatic p...

Embodiment 2

[0043] The raw materials are weighed according to the following weight percentages: molybdenum powder 55%, copper powder 45%. Put the weighed raw materials into a stainless steel ball mill tank for ball milling, using tungsten alloy balls for ball milling, and the ball milling time is 20 hours to obtain mixed powder. The obtained mixed powder was put into a soft mold for cold isostatic pressing, the cold isostatic pressing pressure was 260 MPa, the temperature was 20°C, and the time was 15 minutes to obtain a cold compact. Take out the cold compact from the soft film, carry out hydrogen reduction, and complete the pre-sintering process at the same time. The hydrogen reduction process is as follows: heat preservation at 350°C for 1h, and heat preservation at 700°C for 1h. Put the reduced compact into a metal sheath, heat and degas it, and seal it in a vacuum sheath. Put the cold-pressed billet containing the metal sheath in the hot isostatic pressing equipment for hot isostat...

Embodiment 3

[0046] The raw materials are weighed according to the following weight percentages: molybdenum powder 45%, copper powder 55%. Put the weighed raw materials into a stainless steel ball mill tank for ball milling, using tungsten alloy balls for ball milling, and the ball milling time is 16 hours to obtain mixed powder. Put the obtained mixed powder into a soft mold for cold isostatic pressing, the cold isostatic pressing pressure is 250MPa, the temperature is 20°C, and the time is 8min, to obtain a cold compact. Take out the cold compact from the soft film, carry out hydrogen reduction, and complete the pre-sintering process at the same time. The hydrogen reduction process is as follows: heat preservation at 300°C for 1 hour, and heat preservation at 730°C for 1 hour. Put the reduced compact into a metal sheath, heat and degas it, and seal it in a vacuum sheath. Put it in the hot isostatic pressing equipment for hot isostatic pressing and densification sintering. The hot isost...

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Abstract

The invention discloses a hot isostatic pressing preparation method of a high-density molybdenum-copper alloy and the hot isostatic pressing preparation method is used for solving the problems that material heat conductivity and device air tightness are influenced by defects such as relatively low relative density, non-uniform component distribution and relatively small sample sizes existing in a process of preparing a molybdenum-copper alloy by using an existing method. The hot isostatic pressing preparation method comprises the following steps: performing ball milling on weighed raw materials, firstly preparing a cold-pressed billet, and then removing a low-density oxide phase by virtue of hydrogen reduction. By adopting a high-vacuum hot isostatic pressing dense sintering method, the density problem of the molybdenum-copper alloy can be successfully solved, the sintering temperature can also be greatly reduced, interface structures of the materials can be effectively controlled, uniform distribution of components can be achieved, and the heat-conducting properties of the materials can be optimized. By adopting the hot isostatic pressing preparation method disclosed by the invention, the molybdenum-copper alloy with high density, high copper content and large size can be successfully prepared, requirements of electronic packaging and heat sink materials for the properties such as material strength and heat conductivity can be met, relatively good market application prospects can be achieved, and the molybdenum-copper alloy is worthy of being popularized and applied in large scale.

Description

technical field [0001] The invention relates to the field of materials, in particular to the field of electronic packaging and heat sink materials, in particular to a method for preparing high-density molybdenum-copper alloy by hot isostatic pressing. The molybdenum-copper alloy with high density, high copper content and large size can be prepared by adopting the invention, which is especially suitable for collector parts of traveling wave tubes and has good application prospects. Background technique [0002] Traditional electronic packaging materials mainly include Invar (Chinese name: Invar alloy, that is, an iron alloy containing 35.4% nickel), Kovar (Chinese name: Kovar alloy), pure Mo, pure W, Cu, Al, etc. Among them, Invar and Kovar have poor thermal conductivity; while pure Mo and pure W are difficult to process and have high density; the thermal expansion coefficients of Cu and Al are too large, which is prone to thermal stress problems. Based on the above shortcom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C9/00C22C27/04
Inventor 刘朋闯李强帅茂兵刘炳刚张天助
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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