The processing type of tungsten alloy rods is a key link affecting their final performance, precision and application scenarios. Different processing technologies endow tungsten alloy rods with distinct service characteristics by regulating the material's microstructure (such as grain size, density and stress state). Based on the processing type, the classification of tungsten alloy rods includes four categories: sintered tungsten alloy rods, pressure-processed tungsten alloy rods, precision-processed tungsten alloy rods and composite-processed tungsten alloy rods.
Sintered tungsten alloy rods: As the basic form in the production process of tungsten alloy rods, they refer to primary products prepared by powder metallurgy sintering process without subsequent pressure processing or precision treatment. Their core feature is retaining the original microstructure formed during the sintering process. The application scenarios are mainly concentrated in two aspects: first, serving as raw materials for pressure-processed and precision-processed tungsten alloy rods to provide a foundation for subsequent performance optimization; second, being applied in fields with low requirements for surface precision and mechanical properties, such as rough counterweights in the military industry and temporary supports in mechanical manufacturing.
Pressure-processed tungsten alloy rods: They take sintered tungsten alloy rods as blanks and realize densification and performance enhancement by applying external forces to cause plastic deformation of the material. The core processes include three main methods: forging, rolling and drawing. The application scenarios focus on fields with high requirements for mechanical properties: forged alloy rods, due to their high strength and large diameter, are used in engine structural parts in the aerospace field and transmission shafts of large machinery; rolled alloy rods, with good dimensional accuracy and strong batch production capacity, are used as welding electrodes; drawn alloy rods, with small diameter and good toughness, are used in filament supports of electronic equipment and micro-shaft parts of precision instruments.
Precision-processed tungsten alloy rods: They are high-end forms that realize the optimization of dimensional accuracy and surface quality through precision processing technologies such as grinding, polishing and lapping on the basis of pressure processing. The application scenarios are concentrated in the field of high-end precision manufacturing: in the electronic field, they are used as mandrels for semiconductor packaging molds, and high precision ensures the dimensional consistency of chip packaging; in the medical field, they are used as transmission rods for minimally invasive surgical instruments, and the mirror-like surface reduces tissue damage; in the aerospace field, they are used as gyro shafts for inertial navigation systems, and high precision and low surface roughness ensure navigation accuracy; in the precision instrument field, they are used as guide shafts for optical instruments, and the control of straightness error realizes the high-stability operation of equipment.
Composite-processed tungsten alloy rods: They are innovative forms that combine multiple processing technologies to achieve functional integration or performance customization. Usually based on pressure processing or precision processing, they are matched with surface treatment, heat treatment, dissimilar material composite and other processes to meet the personalized needs of special scenarios. The application scenarios focus on high-end fields with extreme environments or multi-functional requirements: composite rods with "precision processing + ceramic coating" are used as wear-resistant guide pillars in mold manufacturing, and their service life is significantly improved; tungsten-copper composite processed rods are used as conductive contacts for high-voltage switches, combining the high temperature resistance of tungsten and the high electrical conductivity of copper; composite rods with "sintering + pressure processing + precision grinding" are used as control rods in the nuclear industry, realizing the unity of high density, high precision and corrosion resistance.
