Carbide with high hardness, wear resistance, red hardness and high toughness, is an important tool and structural materials. But it belongs to a brittle material, there is a contradiction between the hardness and strength: the lower the intensity of high hardness; hardness and high strength is low. Conventional WC-based cemented carbide tools and materials can not meet the needs of modern industrial development, which requires the development of a high hardness, high strength and high wear resistance carbide. Carbide grain refinement and development of submicron or micron carbide can solve this problem.

Carbide grain size depends on the size of a WC grain, and difficult to produce sub-micron or micron WC is great, and in turn depends on the size of a WC grain size of tungsten powder particles. It can be seen, tungsten powder fineness and uniformity become prepare submicron or micron carbide key. There are reports of phase relative to a single component of tungsten oxide can be produced submicron or micron W and WC powder. The cyclic redox method for preparing submicron W powder processes. This method compared with the method for preparing submicron W powder at home and abroad are currently having on the process route is simple and easy, easy to control the process parameters, equipment and simple.

Purple tungsten through three successive cycles reduction, reduction process for the area temperature is 640 ℃, the second with a temperature of 760 ℃, three with a temperature of 860 ℃, for 20min when the temperature reaches 860 ℃; twice oxide, process as follows: tungsten powder slowly heating in air to 500 ℃ oxidized, for 10min when the temperature reaches 500 ℃, can be prepared in a particle size distribution between 0.11 and 0.95μm accounted for 93.68%, the specific surface area (BET) of 1.082m2 • g-1 of submicron tungsten powder.

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1. The name of the product design: Tungsten sinkers (flying fish type).

2. The use of product design: fishing gear. Design elements

3. The design: product modeling.

4. The best show design elements or photographs: the main view.

5. rear view and front view of the symmetry, after omitting view.

6. The bottom view and a plan view of symmetry, a bottom is omitted in Fig.




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There are four general tungsten oxide, tungsten oxide, yellow, blue tungsten oxide, purple tungsten oxide, brown tungsten oxide. Purple tungsten oxide morphology is specific, by APT pseudo crystalline whisker-like needles formed, and blue tungsten oxide, their morphology similar with APT.

How to judge the quality of purple tungsten oxide, is a producer of research and concern; and also users of concern and must be mastered, because it directly affects the tungsten powder, tungsten carbide powder production and quality, the original purple and blue detect tungsten tungsten, yellow tungsten project the same, but the oxygen index, surface area, the proportion of false results differ. Later researchers have proposed the use of phase composition or scanning electron microscopy methods to detect and control, namely WO2.72 phase ≧ 98% or electron microscopy to detect non-needle control the number of particles (particles no needle required) these detection methods cumbersome testing costs are high, even sometimes fail to control the quality of the results. Colorimetry is a more direct control and monitoring of the quality of tungsten purple method using tungsten unique color purple, violet to several types of standard samples made of tungsten, the reference color, determine its quality. According to the producers to determine its color quality and control of purple violet tungsten tungsten production status are also available. Assay is easier detecte purple tungsten oxide quality, saving time and cost.

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Fine grain carbide due to its high toughness, high wear resistance and good high temperature strength, excellent performance in recent years, been increasingly widespread attention, the demand and applications continue to expand. Ultrafine tungsten powder, tungsten carbide powder is an important raw material for the production of fine-grain carbide powder particle size and uniformity strongly affect the performance of Carbide, how to produce a fine particle size and uniform ultrafine tungsten powder is made Take the key to ultra-fine grain carbide.

Performance tungsten oxide materials will directly affect the reduction behavior of tungsten powder and final product performance, therefore, the question about what kind of material most suitable for the production of ultra-fine tungsten powder materials science has always been of widespread concern workers. Although blue tungsten by hydrogen reduction process is currently taking the most widely used tungsten powder raw materials, as long as at low temperatures, dry hydrogen, high hydrogen flow conditions thin material layers, you can use hydrogen reduction process for the production of tungsten blue ultrafine tungsten powder, but too high hydrogen flow rate and the material layer is too thin will lead to increase in cost. Purple tungsten in recent years to develop a tungsten oxide product, its phase component WO2.72 or W18O49, due to its unique properties, in the production of ultra-fine tungsten powder reflects its superiority, many materials and metallurgy scholar have carried out their research.

Under the same conditions, the comparison of the performance difference between blue and purple tungsten tungsten production of hydrogen reduction of tungsten powder. The results show that: Compared with blue tungsten, tungsten powder size purple tungsten produced finer and more uniform, and tungsten powder particle size less affected by the amount of loading boats and hydrogen flow. And from the microscopic structure and mechanism of hydrogen reduction of raw materials analyzes the causes of both tungsten powder raw materials to produce different size and uniformity of the difference.

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