The process of making high-purity tungsten wires involves several key steps. The following is a detailed manufacturing process:
- Raw material preparation
Selection of high-purity raw materials: The first step in making high-purity tungsten wires is to select high-purity tungsten raw materials. This usually includes high-purity tungsten powder or tungsten compounds, such as tungsten oxide, etc.
- Powder preparation and processing
Powder screening and mixing: The selected tungsten raw materials are screened to ensure that the powder has a uniform particle size. This is followed by mixing to ensure the uniform distribution of tungsten powder in subsequent steps.
Pressing and drying: The mixed tungsten powder is placed in a mold for pressing to form a tungsten blank with a certain shape and density. After that, it is dried to remove moisture and volatile impurities in the tungsten blank.
- Sintering and densification
Pre-sintering: The dried tungsten blank is placed in a hydrogen sintering furnace for pre-sintering. At high temperatures, the tungsten particles begin to condense and form a preliminary dense structure.
Complete sintering: The pre-sintered tungsten blank is placed in a special water cooling treatment device and heated by electricity to a higher temperature to achieve complete sintering. In this step, the density of the tungsten blank will be further improved to about 85% to 95%.
- Extrusion forging processing
Heating and hammer forging: The sintered tungsten rod is heated to 1200℃ to 1500℃ to make it more tough. Then, the tungsten rod is squeezed and hammered by a hammer forging machine to reduce its diameter and improve its crystal structure.
Drawing: After extrusion and forging, the tungsten rod has a certain strength and toughness. At this time, it can be drawn through a wire drawing die to make its diameter thinner, and finally obtain a high-purity tungsten wire of the required diameter.
- Subsequent processing and testing
Surface treatment: According to needs, the surface treatment of the drawn tungsten wire, such as coating treatment, is carried out to improve its oxidation resistance and service life.
Quality inspection: The quality inspection of the manufactured high-purity tungsten wire, including purity inspection, diameter inspection, tensile strength inspection, etc., is carried out to ensure that it meets the relevant standards and requirements.
More details of tungsten wires, please visit website: http://tungsten.com.cn/tungsten-wires.html
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