The specific value of WS₂’s low friction coefficient varies by condition but is precisely quantifiable. In an ideal vacuum (e.g., 10⁻⁶ Torr), dry WS₂ achieves a friction coefficient of 0.03, as measured in tribological tests (pin-on-disk, steel counterface, 1-5 N load, 0.1 m/s speed). In dry nitrogen, it ranges from 0.04 to 0.06, slightly higher due to minor gas interactions. In ambient air (20-30% humidity), it typically falls between 0.06 and 0.1, rising to 0.1-0.2 in 50-70% humidity due to water adsorption.
These values are derived from its layered structure, where weak interlayer forces allow shearing, minimizing resistance. The 0.03 value in vacuum is among the lowest for solid lubricants, slightly better than MoS₂ (0.04) and far below graphite (0.1-0.2). Testing conditions matter: higher loads (e.g., 10 N) can lower μ to 0.02-0.03 by aligning layers, while rough surfaces or oxidation increase it. Above 510°C in air, μ jumps to 0.6-0.8 as WO₃ forms, losing lubricity.
This precision guides its use in applications like spacecraft bearings (0.03 in vacuum) or industrial gears (0.06-0.1 in air). Standardized tests (e.g., ASTM G99) confirm these values, ensuring reliability in design specifications.
Customized tungsten disulfide
If you are interested in purchasing or customizing tungsten disulfide, and want to know its detailed information, market conditions, and latest prices, please contact China Tungsten Intelligent Manufacturing Technology Co., Ltd.. For more information and product information about tungsten disulfide, please visit our professional tungsten disulfide website for detailed introduction.
Customized tungsten products
China Tungsten Intelligent Manufacturing Technology Co., Ltd. and its parent company have been working in the tungsten and molybdenum products industry for nearly 30 years, specializing in flexible customization of tungsten and molybdenum products worldwide. China Tungsten Intelligent Manufacturing Technology Co., Ltd. can customize and process tungsten and molybdenum products of various specifications, performances, sizes, and grades according to customer needs.
Latest preferential prices for tungsten products
The WeChat public account “China Tungsten Online” updates the prices of various tungstates such as tungstates such as tungstate powder, ammonium tungstate, tungsten products, high-density tungsten alloys, cemented carbides, tungsten concentrates, etc. on a daily basis. At the same time, it provides the most professional WeChat group in the industry for everyone to exchange supply and demand information, and you can exchange information about tungsten powder at any time. Follow “China Tungsten Online” and join the China Tungsten Online WeChat exchange group. Daily tungsten product prices and supply and demand information will be delivered in a timely manner, and real-time communication will be carried out. For more tungsten product market trends, products and information, please follow the “China Tungsten Online” WeChat public account, or visit http://news.chinatungsten.com to obtain daily updated information.
Contact information: sales@chinatungsten.com
Tel: +86 592 5129696 / 86 592 5129595
Scan the QR code to follow the “China Tungsten Online” WeChat public account and get real-time updated tungsten, molybdenum and rare earth product market prices and information for free every morning.