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Terahertz Spectroscopy Study of III–V Nitrides
Published in Zhe Chuan Feng, Handbook of Solid-State Lighting and LEDs, 2017
Grade HBR was developed for applications where higher mechanical strength, higher temperatures, and moisture resistance are important. The binder phase in this material is calcium borate (Ca3(BO3)2), an inorganic material with a nominal melting point of 1150°C. Calcium borate is not water soluble, so moisture sensitivity is not an issue. The hot pressing process for this grade is similar to that for grade HBN, and it displays the same orientation effects.
Tribological performance and mechanism of 2D calcium borate nanoslice capped with stearic acid in rapeseed oil
Published in Journal of Dispersion Science and Technology, 2022
Kecheng Gu, Wang Lin, Xin Yuan, Hongye Peng, Shunxiang Wang, Jiacheng Lv, Zaifa Zhu
Among various inorganic materials used as lubricant additives, calcium borate nanoadditives are of special significance due to their good friction-reducing, antiwear, antioxidant, and pleasant odor.[8,17–19] Nevertheless, the previous researches on the tribological properties of calcium borate nanoadditives mainly were conducted in mineral oil or focused on those of spherical nanoadditives.[8,17,19,20] Relatively few reports are currently available about the tribological performances of 2D calcium borate nanoslices in vegetable oils.[21,22] As we know, contamination of eco-system resulted from the mineral-based lubricant oil can no longer be ignored because of their difficult biodegradability and inherent toxicity.[23–26] On the other hand, vegetable oils used as base fluids conform with the developmental trend of environmental friendly lubricant oil thanks to their good lubricity, non-toxicity, and readily biodegradable nature.[27,28] Moreover, the tribological behaviors of 2 D nanoadditives may differ greatly from those of corresponding spherical nanoadditives.[29–31] Consequently, researches on the tribological behaviors of 2D calcium borate nanoslices in vegetable oils are still important and needed.