Method for preparing Mo-Cu composite material

A technology of composite materials and composite powders, which is applied in the field of preparation of Mo-Cu composite materials, can solve problems such as limited effect, difficulty in guaranteeing material properties, and harsh sintering conditions, and achieve the effect of increasing density and improving sintering activity

Inactive Publication Date: 2008-02-13
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to achieve the desired density and structure of the Mo-Cu composite material prepared by the high-temperature liquid phase sintering method under conventional sintering conditions, and the relative density is only about 94-95%.
Increasing the green density by increasing the molding pressure can increase the final density of the composite material, but it is only effective within a certain range, and the effect is limited; increasing the sintering temperature can also significantly increase the density, but the sintering conditions are harsh and high temperature The lower grain size becomes larger, and the liquid phase copper overflows too much, which is easy to cause uneven composition
Although the immersion method can obtain higher density, it is difficult to control the microstructure, the material performance is difficult to guarantee, and surface treatment is required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Raw material mixed powder

[0030] Using Cu powder (62μM, 99%), Mo powder (4-6μm, 99.5%) and Ni powder (75μm, 99.6%) as raw materials, according to the mass ratio of Mo: Cu: Ni = 88: 11.5: 0.5, the composite Put the powder into a stainless steel ball mill tank (1000mL), and mix the powder on a QM-ISP high-energy planetary ball mill to mix the raw materials evenly. The mixing time is 30 minutes.

[0031] 2. Mechanical alloying powder making

[0032] The specific process parameters are set as:

[0033] Ball milling medium: stainless steel ball (10mm in diameter);

[0034] Ball material ratio: 20:1;

[0035] Fill factor: 0.5;

[0036] Ball milling time: 25h;

[0037] Ball mill revolution speed (ω R ): 280r / min;

[0038] Ball mill rotation speed (ω r ): 265r / min;

[0039] Protective atmosphere: argon;

[0040] Process control agent: ethanol (3% of the total powder).

[0041] According to the above process parameters, the composite powder was mechanically alloy...

Embodiment 2

[0051] 1. Raw material mixed powder

[0052] Using Cu powder (62 μm, 99%), Mo powder (4-6 μm, 99.5%) and Ni powder (75 μm, 99.6%) as raw materials, according to the mass ratio of Mo: Cu: Ni = 94: 5.6: 0.4, the Put the composite powder into a stainless steel ball mill tank (1000mL), and mix the powder on a QM-ISP high-energy planetary ball mill to mix the raw materials evenly. The mixing time is 40 minutes.

[0053] 2. Mechanical alloying powder making

[0054] The specific process parameters of mechanical alloying pulverization are set as follows:

[0055] Ball milling medium: stainless steel ball (8mm in diameter);

[0056] Ball material ratio: 20:1;

[0057] Fill factor: 0.4;

[0058] Ball milling time: 30h;

[0059]Ball mill speed: 290r / min;

[0060] Ball mill revolution speed (ω R ): 290r / min;

[0061] Ball mill rotation speed (ω r ): 270r / min;

[0062] Protective atmosphere: argon;

[0063] Process control agent: ethanol (4% of the total powder).

[0064] Acco...

Embodiment 3

[0074] 1. Raw material mixed powder

[0075] Using Cu powder (62 μm, 99%), Mo powder (4-6 μm, 99.5%) and Ni powder (75 μm, 99.6%) as raw materials, according to the mass ratio of Mo: Cu: Ni = 85: 14.5: 0.5, the composite Put the powder into a stainless steel ball mill tank (1000mL), and mix the powder on a QM-ISP high-energy planetary ball mill to mix the raw materials evenly. The mixing time is 30 minutes.

[0076] 2. Mechanical alloying powder making

[0077] The specific process parameters of mechanical alloying pulverization are set as follows:

[0078] Ball milling medium: stainless steel ball (10mm in diameter);

[0079] Ball material ratio: 20:1;

[0080] Fill factor: 0.5;

[0081] Ball milling time: 30h;

[0082] Ball mill speed: 270r / min;

[0083] Ball mill revolution speed (ω R ): 270r / min;

[0084] Ball mill rotation speed (ω r ): 260r / min;

[0085] Protective atmosphere: argon;

[0086] Process control agent: ethanol (4% of the total powder).

[0087] A...

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Abstract

The invention relates to a method of preparing a Mo-Cu composite material. A mixture ball consisting of 85 to 95 weight percent Mo powder, 4.65 to 14.5weight percent Cu powder and 0.35 to 0.5weight percent Ni powder is milled into mechanical alloying composite powder; after pressing and shaping, the Mo-Cu composite material is made after the power is sintered in a hydrogen sinter furnace. The Mo-Cu composite material of the invention has relative density of up to 98percent, which not only meets the use requirements of materials of parts of high-performance engines and other heat sink materials, but also is characterized by oxidation resistance, corrosion resistance, creep resistance, fatigue resistance and tiny deformation at high temperature.

Description

technical field [0001] The invention relates to a method for preparing Mo-Cu composite material, in particular to a method for preparing Mo-Cu composite material by mechanical alloying. Background technique [0002] Mo is a refractory metal with a high melting point (2620±20°C), and has the characteristics of elastic modulus, high temperature strength, low vapor pressure, and small linear expansion coefficient. The Mo-Cu composite material is based on Mo (content is 85-99%), and Cu composition with good thermal conductivity is added, and its density is 9.7-10.1g / cm 3 . [0003] Mo-Cu composite materials have sufficient high temperature strength, excellent resistance to high temperature gas ablation, arc corrosion resistance and good thermal shock resistance, so they can be used as high temperature structural materials, electrical contact materials, EDM electrode materials, etc. . Mo-Cu composite materials also have high thermal conductivity and appropriate thermal expansi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C27/04B22F9/04B22F3/16
Inventor 白培康胡保全杨亚琴王建宏徐宏
Owner ZHONGBEI UNIV
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