Tungsten steel products contain about 18% tungsten, tungsten steel belongs to cemented carbide, also called tungsten-titanium alloy. The hardness is 10K on the Vickers scale, second only to diamond. Because of this, tungsten steel products <commonly found in tungsten steel watches>, has the characteristic of not easy to be worn. Tungsten carbide products are commonly used in lathe tools, impact drill bits, glass cutter bits, tile cutters, hard, not afraid of annealing, but brittle. It is a rare metal.
Tungsten carbide sintering moulding:
Tungsten carbide sintering moulding is to press the powder into also material, and then into the sintering furnace heated to a certain temperature 〔sintering temperature〕, and keep it for a certain period of time (heat preservation time), and then cool it down, so as to get the tungsten steel material with the required performance.
The tungsten carbide sintering process can be divided into four basic stages:
1: the removal of the forming agent, sintering the initial period with the increase in temperature, the forming agent is gradually decomposed or vaporised, excluded from the sintered body, at the same time, the forming agent more or less to the sintered body of the carbon increase, the amount of carbon increase will be with the type of forming agent, the number of sintering process and the different and change.
Powder surface oxides are reduced, in the sintering temperature, hydrogen can be reduced cobalt and tungsten oxides, if the vacuum removal of forming agent and sintering, carbon and oxygen reaction is not strong. Powder particles ask the contact stress is gradually eliminated, the bonded metal powder began to produce a return and re-incorporation products, surface diffusion began to occur, briquette strength has improved.
2: solid phase sintering stage (800 ° c - eutectic temperature)
At the temperature before the emergence of the liquid phase, in addition to continuing the process that occurs in the previous stage, solid-phase reaction and diffusion intensifies, plastic flow is enhanced, and the sintered body appears to shrink significantly.
3: Liquid phase sintering stage (eutectic temperature - sintering temperature>)
When the liquid phase appears in the sintered body, the contraction is completed very quickly, followed by a crystalline transition to form the basic organisation and structure of the alloy.
4: Cooling Stage (Sintering Temperature - Room Temperature>)
In this stage, the organisation and phase composition of tungsten steel with the different cooling conditions and produce some changes, you can make use of this feature, heat treatment of tungsten steel to improve its physical and mechanical properties.
Tungsten rods are round or square tungsten products. Tungsten is a very hard, dense metal with the highest melting temperature of any metal: 6,192°F (3,422°C). It is a chemical element with atomic number 74. It is a chemical element with an atomic number of 74. tungsten has excellent corrosion resistance and is little affected by acids. Tungsten rods are produced through powder metallurgy manufacturing techniques.
Types of Tungsten Rods are generally classified into pure tungsten rods, tungsten carbide rods, tungsten alloy rods, tungsten copper rods, tungsten conductor rods and so on. Application of Tungsten Rods Tungsten rods can be widely used in lighting, heaters and electronic mechanical engineering. In addition, it can be used to manufacture electric light source, automobile and tractor bulbs, make lattice side rods, frames, wires, electrodes, heaters and contact materials, PCB drills, drill bits, end mills and so on.
Zigong Xinhua Industrial supply of tungsten rods can be produced in random length pieces or cut to the customer's desired length in diameters ranging from 0.020 inches to 0.750 inches. Smaller tolerances can be quoted upon request. In addition, three different surface finishes or surface treatments are available depending on the desired end use.
Post time: Sep-01-2023