Abstract Since the excellent tribological performance of polyhydric alcohols was reported under low loads, several polyhydric alcohols, such as glycerol, draw more attentions and was further investigated. However, the lubricity under high loads and fast rotational speed was rarely reported until now. In our previous work (Zhang R. et al, (2020) Applied Surface Science, 510, 145456) [1] , graphene was formed during sliding as selecting GCr15 ball being the tribopairs under 196 N and 600 rpm. Here, when we conducted the tribological tests of isopropanol under 98, 196 N and 1450 rpm using YG8 balls as tribopairs, to our excitement, amorphous carbon with high degree graphitization and WO3 nanoball were induced by tribochemical reactions that made the tribosystem exhibit extraordinary lubricity. WO3 nanoball was formed originating from the oxidation of WC tribopairs. The flash temperature rises and catalysts were two important roles for inducing amorphous carbon with high degree graphitization. However, the fabricated graphene exhibited poor lubricity compared to amorphous carbon induced by tribochemical reactions. This new find would be potentially applied in machinery and equipment.

中文翻译：

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自配WC摩擦对中异丙醇的摩擦诱导转化和原位形成碳的摩擦学性能

摘要 由于多元醇在低载荷下具有优异的摩擦学性能，因此几种多元醇，如甘油，受到越来越多的关注和进一步研究。然而，在高负荷和高转速下的润滑性，至今鲜见报道。在我们之前的工作中 (Zhang R. et al, (2020) Applied Surface Science, 510, 145456) [1]，石墨烯是在滑动过程中形成的，因为选择 GCr15 球是 196 N 和 600 rpm 下的摩擦对。在这里，当我们使用 YG8 球作为摩擦对在 98、196 N 和 1450 rpm 下对异丙醇进行摩擦学测试时，令我们兴奋的是，高度石墨化的无定形碳和 WO3 纳米球通过摩擦化学反应诱导产生，使摩擦系统表现出非凡的润滑性。WO3 纳米球起源于 WC 摩擦对的氧化。闪蒸温度升高和催化剂是诱导具有高度石墨化的无定形碳的两个重要作用。然而，与摩擦化学反应诱导的无定形碳相比，制造的石墨烯表现出较差的润滑性。这一新发现可能会应用于机械和设备。