2021-04-21
The tungsten carbide is an alloy which has the main components of tungsten carbide powder with metal bender. It is widely used for manufacturing high-speed cutting tools of hard, tough materials. The high-performance tungsten carbide has excellent characteristics.
The Performance And Characteristics Of Tungsten Carbide
1. High hardness and excellent wear resistance
The hardness of cemented carbide can reach 86 to 93HRA, which is equivalent to 69 to 81HRC. High hardness can be maintained at 900-1000 ℃ with excellent wear resistance. Compared to high-speed steel, the cutting speed can be 4-7 times higher with 5-8 times service life, which can cut hard material with a hardness of 50 HRC.
2.High strength and high elastic modulus
The tungsten carbide has a compressive strength of up to 6000 MPa and an elastic modulus (4 ~ 7) × 105 MPa, which both are higher than high-speed steel. However, its bending strength is low, typically 1000 ~ 3000MPa.
3. Excellent corrosion resistance and oxidation resistance
It is generally resistant to atmospheric, acid, alkali and is not easy to oxidize. There is a wide range of applications in the industries of fluid and chemical, such as various valves used for fluid control including regulating valves, black water valves, lock slag valves, and decompression noise reduction valves, etc.
4.Small linear expansion coefficient
When the tungsten carbide products are working, the shape size the stable
5.The finished products are no longer processed with re-grinding
Due to the high hardness and brittleness, the powder metallurgical formation is no longer cutting or re-grinding, and when the demand is re-processing, it can adopt electric sparks, line cutting, electrolytic grinding and other electric processing or special grinding wheel cutting. It is usually used by a certain specification paper made of cemented carbide, adopting brazing, bonding or mechanical clamping for the blade body or mold.
What Are The Methods Of Changing The Performance Of Tungsten Carbide
In order to adapt to the harsh environment under different working conditions, tungsten carbide often needs to be reprocessed to make corresponding changes for the original performance, so what are the methods to change the performance of tungsten carbide?
1. Improve the quality of raw materials
Improve the purity of raw materials
High-strength, high-impact toughness alloys have high requirements for the purity of raw materials, while continuous cutting tool with low impact load but high machining accuracy, have low requirements for raw material purity.
Control the particle size and distribution of raw materials
It should avoid excessively large particles in the carbide or cobalt powder raw materials, and prevent the tungsten carbide from forming coarse carbide grains and cobalt pools during sintering.
At the same time, the size and composition of the particle materials should be controlled to meet the needs of different products. For example, carbide cutting tools should adopt tungsten carbide powder with a fisher particle size of less than 2 microns, wear-resistant tools should use tungsten carbide powder with a particle size of 2-3 microns, and mining tools should adopt tungsten carbide powder with the particle size of larger than 3 microns.
2. Improve the structure of the tungsten carbide
3. Improve or select new hard phase and binder phase
The performance of tungsten carbide is affected by the composition and structure of the hard phase and the binder phase. Generally speaking, when the content of the hard phase is high and the grains are finer, the hardness is high and the wear resistance is good, with poor impact resistance. Improving the hard phase and the binder phase is one method to change the performance.
4. Surface hardening treatment
To solve the contradiction between wear resistance and toughness, hardness & strength of tungsten carbide, surface hardening treatment can be adopted.
The coating is physically or chemically depositing a layer of TiC or TiN on the surface of the cemented carbide to increase the wear resistance. The most rapid development at present is the coated tungsten carbide.
5. Add elements or compounds
6. Heat treatment
What Are The Common Applications Of Tungsten Carbide
Tungsten carbide is widely used in various industries due to its unique high hardness and strong wear resistance. What are its common applications?
1.Cutting tools
Tungsten carbide can be used as a variety of cutting tools. Because of its high hardness and strong resist compression performance, tungsten carbide is one of the best material choices for cutting tools. The tungsten carbide cutting tools include carbide drill bits, small circular saw blades, carbide rotary burr and so on. As the material of cutting tools is the most widely used field for tungsten carbide.
2. Mining tools
The cemented carbide for mining accounts for about 30% of the total tungsten carbide production. Thanks to the high hardness, strong impact toughness, outstanding bending strength and excellent wear resistance, carbide mining tools are usually applied in geological exploration drill bits, roller cone drills and coal cutters for petroleum and gas fields, engineering excavation road tools, percussion drilling in the building materials industry.
3. Tungsten steel mold material
Under normal circumstances, the proportion used in the manufacturing of various molds accounts for about 8%, which includes carbide drawing dies, cold heading dies, cold punching dies, cold extrusion dies, hot forging dies and drawing mandrels. Usually, the cemented carbide applied for making molds is selected from medium and high cobalt, coarse grain grades.
4. Wear parts
The tungsten carbide wear parts include carbide nozzles, carbide balls, tungsten carbide valve seat & valve sleeves, carbide tire cleats, carbide guide rails and so on.
5. Structural parts
The carbide structural parts include rotating seal ring, lathe head, grinding machine spindle, bearing, etc, which can effectively solve the problems of mechanical seal ring thermal cracks.
Trustworthy Tungsten Carbide Manufacturer - XYMJ
XYMJ has focused on the production and processing of tungsten carbide products for more than 20 years, the products including carbide dies, bushings, valve seats, inserts & cutting tools, carbide rods and bars, carbide plates & strips and other customized tungsten carbide wear parts. It has superb blank forming and precision machining capabilities with high performance and a low-cost advantage. It has a grinding machine for smooth finish, frosted finish, concave finish, and convex finish, which can better satisfy customer's requests.
Summary
High performance of tungsten carbide, in addition to high hardness, there are also excellent wear resistance, corrosion resistance, high-temperature resistance, etc and can be used as cutting tools, mining tools, wear parts, etc, which are also the reasons for wide applications in various industries. XYMJ is a trustworthy carbide manufacturer, providing superior quality tungsten carbide products with advanced equipment.
