Molybdenum-copper alloy is usually formed by combining copper and molybdenum through sintering, hot pressing and other processes. Molybdenum has an extremely high melting point and a low coefficient of thermal expansion, while copper has excellent thermal conductivity, which allows the combination of the two to effectively dissipate heat in high-temperature environments without cracking or failing due to differences in thermal expansion.
Therefore, molybdenum-copper heat sink materials are widely used in fields that require high thermal conductivity and thermal stability, such as semiconductor lasers, laser devices and high-power electronic devices.
The manufacturing process of molybdenum-copper heat sink material mainly includes the following steps:
1. Raw material preparation
The powder of molybdenum and copper is the basic raw material for the production of molybdenum-copper composites. Molybdenum powder is generally made of high-purity molybdenum powder, while copper powder is obtained by reducing copper oxide. In order to improve the homogeneity of the composite, it is often necessary to apply surface treatment to both powders, such as surface oxidation or coating with a protective layer.
2. Powder mixing
Molybdenum powder and copper powder are mixed in a certain ratio to form a homogeneous powder mixture. The mixing process typically employs mechanical alloying (MA) or ball milling, which effectively results in a uniform distribution of molybdenum and copper powders on a microscopic scale. By controlling the mixing time and equipment parameters, the particle size and morphology of the powder can be adjusted, which affects the properties of the final material.
3. Sintering and hot pressing
Sintering is one of the core processes in the manufacture of molybdenum-copper composites. By high-temperature sintering, molybdenum and copper powders are combined at the right temperature to form a dense composite material. During the sintering process, molybdenum particles form interconnected network structures in the copper matrix, thereby improving the thermal conductivity and mechanical properties of the material. In order to improve the density and strength of the material, it is often necessary to heat press it, which can effectively avoid uneven properties due to porosity during sintering.
4. Post-processing
Sintered molybdenum-copper composites usually need to go through a series of post-treatment processes, such as hot isostatic pressing (HIP), machining, surface treatment, etc., to remove unnecessary oxides and porosity, and further improve the density and surface finish of the material.
