The Knowledge Explanation of Tungsten Carbide Including Its Per

  • The tungsten carbide is an alloy that is obtained through the powder metallurgical method. The main component of the powders that make up the alloy is an adhesive that includes tungsten carbide, titanium carbide, and various other metal powders such as cobalt and nickel. Its primary purpose is in the production of high-speed cutting tools, as well as cutting edges for hard and tough materials, as well as high-wear parts for the fabrication of cold dies and measuring tools.

    Tungsten carbide's mechanochemical and physicochemical properties

    1.  Resistance to wear and tear

    The tungsten carbide's resistance to wear is the characteristic that stands out the most about it. Carbides, depending on the application, can last anywhere from 20 to 100 times longer than certain wear-resistant steel alloys.

    2.  Subverting the opposition

    When a bending force is applied to sintered carbide, which has a high elastic modulus, the bend angle is reduced to its minimum possible value.

    3. Corrosion resistance

    Because carbides are typically chemically inert, it can be used in a wide variety of environments, including those that are subject to corrosion.

    4.  Resistance to torsional bending

    Carbide is the material of choice for use in high-speed operation applications because it can withstand twice as much torsion as high-speed steel.

    5. The ability to withstand compression

    It has been shown that certain grades of cobalt carbide and cobalt can perform flawlessly even when subjected to pressures of up to 7 million kPa, making it an excellent choice for use in pressure applications.

    6. Strenuousness

    Cemented carbide grades that have a high percentage of binder in them have excellent resistance to impact.

    7. A resistance to wear at low temperatures

    Even when subjected to temperatures that are extremely low, carbide retains a high degree of wear resistance and, in the absence of a lubricant, offers friction coefficients that are relatively low.

     

    Tungsten carbide cutters have a variety of applications.

     

    - The most versatile application for tungsten carbide is the cutter tool, which can be used to make a lathe tool, milling cutter, planner tool, drilling bit, and so on

    - Among these, the tungsten cobalt carbide can be used for processing black metal, non-ferrous metals, and the processing of non-metallic materials such as colloidal wood, cast iron, and cast brass, among other things

    - When working with steel and other black metals, tungsten titanium cobalt is an excellent choice for long chip processing

    - Which components of the same alloy have a higher cobalt content and are suited for rough machining, and which components have a lower cobalt content and are suited for fine machining



    Mold material

    The majority of applications for cemented carbide include cold wire drawing dies, cold stamping dies, cold extrusion dies, as well as other cold work molds.

    Under the wear-resistant working conditions of impact or strong impact, the tungsten carbide dies are required to have good anti-polishing toughness, fracture toughness, fatigue strength, bending strength, and good wear resistance. Additionally, the dies must be able to withstand the conditions without breaking.

    If the wear resistance of the carbide is increased, this will inevitably lead to a reduction in its toughness, and if the toughness of the carbide is increased, this will also inevitably result in a reduction in its wear resistance. In general, the relationship between wear resistance and toughness of the carbide is a contradictory one. Because of this, tungsten carbide dies for wire drawing is necessary to meet particular usage requirements when selecting a tungsten carbide grade. These requirements are based on the processing objects and the conditions of the machining.

    If the grade that you have chosen is prone to producing early cracks and damage, it is recommended that you use the grade that has a high level of toughness. If the grades that were chosen are easily damaged as a result of wear, then it is appropriate to select a grade that has a higher level of hardness and better resistance to wear.

    Instrument for measuring as well as wear parts

    The easy-to-wear surface inlay and parts of the measuring tool, grinding machine precision bearing, the wear parts such as guide plate and guide rod of centerless grinder, and lathe center all make use of tungsten carbide.

    Heat Treatment Of Tungsten Carbide

    There are four primary steps involved in the tungsten carbide heat treatment process.

    1. Eliminating the agent that causes molding and the pre-sintering step

    In the beginning of the sintering process, the molding agent will gradually vaporize or decompose, but this will not affect the sintered body. At the same time, molding agents carburize the sintering process, and the amount of carbon produced will vary depending on the type, quantity, and method of sintering. At the sintering temperature, hydrogen has the ability to reduce oxides of cobalt and tungsten, in addition to the powder surface oxide being reduced. The contact stress that exists between the powder particles will gradually disappear when the reaction between carbon and oxygen is not very strong. The bonding metal powder starts to generate a reaction, which is followed by recrystallization, and surface diffusion also starts to take place. The block's already impressive strength has been further enhanced.

    2. The stage of solid phase sintering, which takes place at 800 degrees Celsius (the eutectic temperature).

    In the presence of the liquid phase, in addition to the process of continuing the previous stage, solid-phase reactions and diffusion become more severe, which results in an enhancement of plastic flow; as a result, the sintered body appears to undergo obvious contraction.

    3.  Liquid phase sintering stage (eutectic temperature - sintering temperature)

    As soon as the sintered body enters its liquid phase, the contraction process is finished very quickly, and it is then followed by the generation of a crystallization transition. The fundamental architecture and organization of the carbide are brought into being.

    4. The cooling stage, which takes place between the sintering temperature and room temperature

    In this stage, the organizational and phase components of the tungsten carbide have certain changes with the different cooling conditions. In order to make use of this property and improve its physical-mechanical performance, heat treatment of the cemented carbide is required.