Tungsten/Chromium (W90/Cr10) is a high-performance alloy engineered for applications demanding exceptional thermal stability, corrosion resistance, and mechanical strength. Composed of 90% tungsten (W) and 10% chromium (Cr), this alloy combines tungsten’s superior refractory properties with chromium’s corrosion-resistant and hardening effects, resulting in a material capable of performing under extreme conditions (Penrice, 2010; Schmidt & Ogden, 1963).
Material Overview
Tungsten contributes its signature properties of ultra-high melting point (3422 °C), excellent tensile strength, and outstanding thermal and chemical stability. With a density of approximately 19.3 g/cm³ and a low vapor pressure, tungsten ensures mechanical integrity even at elevated temperatures. Chromium, with its melting point of 1907 °C, introduces oxidation resistance, hardness, and corrosion protection, forming a stable Cr₂O₃ oxide layer that enhances the alloy’s environmental durability (Penrice, n.d.).
Physically, the W 90/Cr 10 alloy exhibits high density and superior thermal conductivity, allowing for efficient heat dissipation in high-stress environments. Chemically, the alloy maintains excellent oxidation resistance and inertness in both acidic and basic atmospheres, making it ideal for components exposed to thermal cycling and corrosive media (Heng, n.d.).
Microstructure and Properties
The alloy’s microstructure typically consists of a tungsten-rich matrix with chromium uniformly distributed at grain boundaries. This configuration improves microstructural cohesion and resistance to grain growth during prolonged thermal exposure. Chromium carbides (Cr₃C₂ or Cr₇C₃) may form under certain processing conditions, improving hardness, wear resistance, and oxidation performance in the presence of carbon (Fu et al., 1994).
Applications and Advantages
Cutting and wear tools. The W 90/Cr 10 alloy is commonly used in the manufacture of cutting tools, drilling heads, and mining equipment, where its combination of hardness, density, and corrosion resistance ensures long service life in abrasive conditions (Schmidt & Ogden, 1963).
Aerospace and defense components. Due to its high density and excellent mechanical stability, W 90/Cr 10 is utilized in counterweights, ballast materials, and kinetic energy penetrators, where precise mass and thermal resistance are essential under dynamic loading (Penrice, 2010).
Chemical and thermal systems. The alloy’s oxidation resistance and thermal conductivity make it suitable for high-temperature furnace parts, chemical reactor linings, and heat exchanger components, especially where exposure to corrosive media is unavoidable (Heng, n.d.).
Advanced composite materials. In material science, W 90/Cr 10 is often used as a reinforcing phase in ceramic composites—notably, tungsten carbide reinforced chromium carbide matrices—which enhance flexural strength, hardness, and fracture toughness for next-generation structural materials (Fu et al., 1994).
Performance Benefits
- High melting point (≈ 3422 °C) and exceptional thermal stability.
- Superior corrosion and oxidation resistance from chromium addition.
- High density and thermal conductivity for heat-dissipating applications.
- Excellent wear resistance and microstructural stability at elevated temperatures.
- Suitable for aerospace, mining, defense, and chemical processing applications.
Goodfellow Availability
Goodfellow supplies W 90/Cr 10 in multiple forms, including rods, foils, and machined parts, suitable for high-temperature, structural, and wear-resistant applications. This alloy’s combination of refractory strength and corrosion resistance ensures performance reliability in the most demanding operating environments.
Explore Tungsten/Chromium (W 90/Cr 10) and related materials in Goodfellow’s online catalogue: Goodfellow product finder.
References
- Penrice, T. W. (2010). Tungsten and Tungsten Alloys. https://doi.org/10.1002/0471238961.2021140716051418.A01.PUB3
- Fu, C.-T., Li, A., Lai, C.-P., & Duann, J.-R. (1994). High Performance Ceramic Composites Containing Tungsten Carbide Reinforced Chromium Carbide Matrix.
- Schmidt, F. F., & Ogden, H. R. (1963). The Engineering Properties of Tungsten and Tungsten Alloys.
- Heng, J. (n.d.). The Application and Developmental Prospects of Tungsten in Chemical Industry. https://doi.org/10.3969/j.issn.1009-0622.2012.01.012