The TG curve of APT weightessness and the change of temperature and reaction time under the condition of a constant heating rate were obtained by thermo gravmetric analysis .According to the weight loss rate of APT, the DTG curve was drawn based on the TG and curves . A dynamic model of the themal decomposition of APT was practiced by using differential method . A linear regression of the experimental data was performed based on the basic equations of the non isotheraml kinetics. The weightless cures showed that the thermal decomposition of APT consist of four main stages,the first dehydration about 126.2 ℃,the second aaround into

Ultrafine grain tungsten carbide ball make WC as hard phase, Co as binder phase. When tungsten carbide ball hard phase of WC grain size is less than 0.2μm, it has high strength and high hardness, its "double high" performance is ordinary carbide ball difficult to achieve, while the low Co ultrafine grain tungsten carbide ball has a high hardness, high strength and wear resistance, has obvious advantages in practical applications.

Low Co ultrafine grain tungsten carbide ball, since it has high hardness, high bending strength, high wear resistance and toughness to meet the high-performance materials tungsten carbide ball higher and higher requirements. Low Co ultrafine grain tungsten carbide ball with higher red hardness, wear resistance than conventional ultrafine grain hardness, have more parts unique advantages in precision machinery, special wear-resistant materials, aerospace and other fields.  the low Co ultrafine grain carbide ball with a WC-Co tungsten carbide ball unparalleled advantages, such as excellent wear resistance and corrosion resistance, and excellent polishing and oxidation resistance addition, has broad application prospects.




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Ammonium paratungstate was prepared from tungsten alloy swarf employing anodic dissolution in sodium hydroxide using a packed bed configuration followed by chemical conversion into ammonium tungstate through tungstic acid. The alkaline tungstate solution was dialysed to recover sodium hydroxide, which could be recycled to the electrolytic dissolution. The influence of anodic current density and other parameters on dissolution/recovery was studied and discussed. It was observed that a current density of 600 mA/100 g scrap could be applied when the concentration of NaOH was maintained around 2.5 M. The energy consumption for anodic dissolution was 2.14 kWh/kg W with more than 90% recovery achieved. XRD studies indicated that the exhausted scrap contained an alloy of nickel and iron with a very low percentage of tungsten. APT sample prepared through anodic dissolution in NaOH was characterized.

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Most of the main ingredients of ultrafine tungsten carbide ball is cobalt alloy (WC-CO), cobalt tungsten carbide made of tungsten carbide ball that working in special conditions. Tungsten carbide ball has high temperature, wear and corrosion resistance, etc. excellent characteristics and high vacuum anti-magnetic tungsten carbide ball has achieved some success.

The magnetic properties of ultrafine WC-Co cemented tungsten carbide ball influenced not only by WC grain size distribution may also be affected by the grain species grown Co phase inhibitor dissolved. The latter acts on the precipitation of dissolved WC, affect the structure of the Co phase. Make tungsten carbide ball exhibit different magnetic properties. When the cobalt content is determined, WC grains more detailed, higher coercivity. Typically coercivity can be used as an indirect measure of WC grain size. Superfine tungsten carbide ball ordinary carbide difficult to achieve high hardness and strength, as well as a much higher coercivity than similar ordinary tungsten carbide ball. In the production of ultra-fine tungsten carbide ball, grain growth inhibitor was added to make the ball appear tungsten carbide ball a lot different from the ordinary characteristics.




Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
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