论文部分内容阅读
文章在稳定固溶体团簇模型的指导下,对白铜合金进行微合金化,将Cu元素在合金中的含量固定为72.22 at.%,改变Ni与M(M为Si,Cr,Cr+Fe)的比例,设计了系列合金成分,并对其抗高温氧化性能及其机制进行了研究.同时加入基体中的Ni-Si元素可以从两方面提高合金的抗氧化性能:以团簇形式加入,形成稳定固溶体结构,可以降低Cu-Ni-Si合金的化学反应活性;Si/Ni比增大后,合金在少量固溶的基础上能析出抗氧化性能优于基体的析出相,且析出越多,抗高温氧化性能越好.所以其抗氧化能力的来源并不是形成致密Si氧化物薄膜.Ni-Cr的同时加入可以明显抑制Cu合金在800?C以下的中温氧化,但其抗高温氧化能力主要与外氧化层中是否形成连续的Cr氧化层有关,因而该系列合金的抗高温氧化能力与Cr/Ni比有密切联系,合理选择团簇内Cr/Ni比例,才能够提高Cu合金的抗高温氧化能力.第四组元Fe和第三组元Cr相比较,不能够起到优先氧化、生成保护性氧化皮的作用,所以Cr,Fe同时添加只能抑制Cu在800?C以下的中温氧化,却不能够提高Cu合金的抗高温氧化能力.
Under the guidance of the stable solid solution cluster model, the white copper alloy is micro-alloyed, the content of Cu element in the alloy is fixed at 72.22 at.%, And the change of Ni and M (M is Si, Cr and Cr + Fe) Ratio, designed a series of alloy composition, and its high temperature oxidation resistance and its mechanism were studied.At the same time adding Ni-Si elements in the matrix can improve the oxidation resistance of the alloy in two ways: to form a stable form The solid solution structure can reduce the chemical reactivity of Cu-Ni-Si alloy. When the Si / Ni ratio is increased, the alloy has better anti-oxidation performance than the matrix precipitates on the basis of a small amount of solid solution. The better the oxidation performance at high temperature, so the source of its antioxidant capacity is not the formation of dense Si oxide film.Ni-Cr can significantly inhibit the oxidation of Cu alloy below 800? C, but its high temperature oxidation resistance and Therefore, the high temperature oxidation resistance of this series of alloys is closely related to the Cr / Ni ratio. Only by reasonably selecting the Cr / Ni ratio in the clusters can the high temperature oxidation resistance of the Cu alloy be improved The fourth component Fe and the third Compared with Cr, it can not preferentially oxidize and form a protective scale. Therefore, the simultaneous addition of Cr and Fe can only inhibit the Cu oxidation below 800? C, but can not improve the high temperature oxidation resistance of Cu alloy ability.