“…Conversely, the friction coefficient when sliding against chrome steel increased with the increase of sliding speed. As can be seen from Table 1, the heat conductivity of stainless steel is the smallest, thus the temperature at the contact area will become higher with the increased sliding speed, which promotes the chemical reaction between stainless steel and Al 2 O 3 [19], leading to the material easier to peel off from the stainless steel ball. As observed in Fig.…”