Tungsten Carbide - an overview | ScienceDirect Topics
Tungsten carbide is a compound that is known for its high melting point, extreme hardness, low friction, chemical stability, resistance to oxidation, and excellent electrical conductivity. It is not easily obtained from its elements through a specific reaction process.
Tungsten Carbide - an overview | ScienceDirect Topics
Tungsten carbide is cermet, a ceramic crystalline material that is bound together with a metallic binder. In the case of seal rings, this is either cobalt or nickel. Tungsten carbide was the first hard, high-strength and high-conductivity material to be used for seal faces and was quite widely used in the 1960s and 1970s.
When tungsten meets carbon - ScienceDirect
2024年2月1日 · Tungsten carbide [WC] is the only stable carbide in the two-phase system tungsten and carbon at room temperature up to 2785 °C, at which an incongruent melting takes place. WC shows a hexagonal crystallographic structure …
Selective synthesis of tungsten carbide phases W2C and WC as ...
2022年1月1日 · Tungsten carbide synthesis by carburization of a high-oxidation-state precursor proceeds over several reduction and carbon insertion steps. The typically observed products for this process include bulk solid phases W, W 2 C, and WC and volatile products H 2 O and CO, as illustrated in Scheme 1. In addition, carbon may be deposited on the solids.
Tungsten Carbide - an overview | ScienceDirect Topics
Tungsten carbide powder is the base for the production of cemented carbides, the vast class of hard, wear resistant, refractory materials in which the hard carbide particles are bound together, or cemented, by a soft and ductile metal binder. Conventional manufacturing of tungsten carbide powders accounts world-wide for the bulk of the tungsten ...
Tungsten carbide – Titanium carbide composite preparation by arc …
2019年3月1日 · For calculation purpose, Poisson's ratio of the tungsten carbide composite was taken 0.21 which is the typical value for WC. Elastic modulus (E s ) of the test material was calculated using the following equation. 1 E r = ( 1 − ν s 2 ) E s + ( 1 − ν i 2 ) E i where ν s is the Poisson's ratio of the material being tested, E i and ν i are ...
Tungsten Carbide compact primary shielding for Small Medium …
2018年6月1日 · Tungsten Carbide is arranged in absorbing rods of 17.05 mm inner diameter with a pitch of 20 mm, voids between absorbing rods are filled with Lead in order to increase the self-shielding of the structure. Design process is illustrated with an application example for a hypothetical 200 MW Small Medium Reactor.
Tungsten Carbide - ScienceDirect
2017年1月1日 · (3), tungsten carbide with an insignificant amount of W 2 C was obtained after combustion, acid enrichment, and refinement. Single-phase tungsten carbide by reaction (2) was obtained in the case of 50% addition of the green mixture of Eq. (1) to that of Eq. (2).
An emergy-based comparison between primary and secondary …
2024年7月1日 · In terms of total emergy flow for one gram of WC, primary tungsten carbide production requires more emergy than secondary tungsten carbide production. In terms of primary tungsten carbide production (Fig. 4-c), local nonrenewable resource “N” equals to 8.99E+11 sej, accounting for the 77.10% of the total emergy input. Such result indicates ...
Microstructure and growth mechanism of tungsten carbide …
2018年6月25日 · Tungsten carbide coatings of columnar and fine-grain lamellar structures can be obtained by CVD. The hardness of the columnar tungsten carbide is generally 20 to 25 GPa, with good wear resistance, but the adhesion between adjacent grains is weak, so cracks are prone to occur in the presence of erosive or corrosive media [7, 28].