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In 1903, German Bolton (W.von Bolton) made tantalum wire as incandescent filament. In 1909, American Coolidge (W.D.Coolidge) used powder metallurgy to make tungsten wire to replace tantalum wire for incandescent lamps. In 1910, molybdenum wire was made by the same process, thus opening up the road of tungsten and molybdenum powder metallurgy. Early tungsten, molybdenum and other refractory metal products were small-sized rods, wires, foils and strips, mainly used in light bulbs and electronics industries. Since the 1940s, due to the need for high-performance and large-sized refractory metal materials in the aviation, aerospace and atomic energy sectors, vacuum smelting technology has been developed, and large isostatic presses and high-temperature sintering furnaces (2400℃) have been developed, thus promoting the development of powder metallurgy technology. China began to industrially produce tungsten and molybdenum materials needed for electric light sources and the electronics industry in the mid-1950s; in the late 1950s and early 1960s, tungsten-rhenium alloy wires, high-density alloys and tungsten-based contact materials were developed; in the mid-1960s, large-scale cold isostatic presses and high-temperature sintering furnaces were built, and a series of large-scale and high-performance tungsten and molybdenum materials and products were developed and produced.

Compared with the smelting process, the advantages of the refractory metal powder metallurgy process are: it can produce a variety of alloys, the alloy composition and structure are uniform, the grain size is small, the process flow is short, the energy consumption is low, and the material yield rate is high. However, the purity of the materials produced by this method is not as high as that produced by the vacuum smelting method (the content of interstitial elements such as carbon, oxygen, nitrogen, etc. is high), which affects the performance of some products.

Preparation process The preparation process of powder metallurgy tungsten and molybdenum materials includes the preparation, pressing, sintering and processing of powders. In industry, hydrogen is used to reduce tungsten trioxide and molybdenum trioxide to produce tungsten powder and molybdenum powder. The reduction process system is mainly based on the powder particle size and particle size composition required for the production of powder. The higher the reduction temperature, the coarser the particle size of the obtained tungsten powder and molybdenum powder. To produce fine-grained powder, secondary reduction is generally used: the first time is to reduce the trioxide to dioxide at a lower temperature (W550~800℃, Mo450~650℃), and the second time is to reduce the dioxide to metal powder at a higher temperature (W750~900℃, Mo900~950℃). To produce coarser powder, primary reduction is used, that is, the trioxide is directly reduced to metal powder at a higher temperature, or the secondary reduction temperature is increased to obtain coarse metal powder. In recent years, the process of reducing blue tungsten oxide has been developed to produce tungsten powder. The particle size of tungsten powder and molybdenum powder has an important influence on their compressibility, sinterability and final product performance.

Qinhuangdao Zhongwei Precision Machinery Co., Ltd. is a MIM factory specializing in the development, production and sales of injection molding products of iron-based, stainless steel, titanium alloy, cemented carbide, high-density (specific gravity) tungsten alloy, copper-based and other metal powder metallurgy materials, and mass production of precision, three-dimensional complex shapes and metal parts with special performance requirements. The company has advanced technology and was formed by a group of professionals who have been engaged in the metal injection molding industry for more than ten years, building an efficient R&D design and manufacturing team. The company has excellent equipment and a full set of metal injection molding production and testing equipment to provide customers with superior quality, on-time delivery and highly competitive price services. The company's products include copper-based powder metallurgy, iron-based metallurgy, tungsten alloy powder metallurgy, metal powder injection molding, metal injection molding, cemented carbide powder metallurgy, stainless steel parts, etc.