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首页> 外文期刊>Journal of Materials Research >Effect of substrate surface orientation on the wettability and adhesion of alpha-Al_2O_3 single crystals by molten Cu
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Effect of substrate surface orientation on the wettability and adhesion of alpha-Al_2O_3 single crystals by molten Cu

机译：基材表面取向对熔融铜对α-Al_2O_3单晶的润湿性和附着力的影响

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摘要

Wetting of alpha-Al_2O_3 single crystals with different crystallographic orientations, R(0112), A(1120), and C(0001), by molten Cu at 1423-1673 K was studied using an improved sessile drop method mainly in a reducing Ar-3 percent H_2 atmosphere to determine the effect of the alumina surface orientation on the wettability and adhesion in this system. The contact angles were generally in the range of 110-117 deg, and the work of adhesion was between 0.7 and 0.8 J m~(-2), without a significant dependence on the alumina surface orientation. This result was explained by the possibly close bond strengths of Cu-O at the oxygen-terminated Cu/[R(0112)] and Cu/[A(1120)] alpha-alumina interfaces and Cu-Al at the Al-terminated (or Al-rich) Cu/[C(0001)] a-alumina interface under high-temperature and low oxygen partial pressure conditions. Additionally, the effects of alumina surface dissolution in the region around the triple junction and H_2 in the atmosphere were examined. Some reasons for the controversy on the bonding nature at the Cu/a-Al_2O_3 interfaces, i.e., Cu-0 or Cu-Al on earth, present in the literature were also addressed.
机译：使用改进的无滴法主要研究了还原性Ar-，研究了在1423-1673 K时熔融Cu对具有不同晶体学取向R（0112），A（1120）和C（0001）的α-Al_2O_3单晶的润湿性。在3％的H_2气氛中，确定该系统中氧化铝表面取向对润湿性和附着力的影响。接触角通常在110-117度的范围内，并且粘合功在0.7至0.8J m·（-2）之间，而对氧化铝表面取向没有明显的依赖性。氧封端的Cu / [R（0112）]和Cu / [A（1120）]α-氧化铝界面处的Cu-O和Al封端的Cu-Al处可能具有紧密的结合强度，从而解释了这一结果。或在高温和低氧分压条件下富铝的Cu / [C（0001）] a-氧化铝界面。另外，检查了三重结周围区域和大气中H_2周围氧化铝表面溶解的影响。还解决了文献中存在的关于在Cu / a-Al_2O_3界面（即地球上的Cu-0或Cu-Al）上的键合性质存在争议的一些原因。

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