论文部分内容阅读
为了研究硅、铝和铬添加剂对钛抗氧化性能的影响,选用并精细加工出Ti-Si(0.25,0.5和1wt%)、Ti-Al(1.65,3,5,10wt%)和Ti-Cr(1,4,11,19wt%)这些特定的二元钛合金。这些合金的抗氧化性能研究是在500～750℃的空气(大气压力)和纯氧(100乇)气氛中进行的,时间从几百到几千小时。通过连续的热解重量测定或间断的样品称重来研究合金的氧化动力学。研究发现,这三种合金元素对钛的氧化行为的影响有很大差别:硅和铝降低氧化速率;铬对氧化速率的影响比较复杂,它取决于添加量,当铬含量约为4wt%时,有强烈的不利影响。除从热解重量测定发现有差别外,形态观察也表明,这些元素显著影响氧化层的结构及附着力。为了说明这些元素的作用,本研究对添加硅、铝和铬改善钛氧化层的机械和物理化学性能的可能性进行了考察、比较和讨论。
In order to investigate the effect of silicon, aluminum and chromium additives on the oxidation resistance of titanium, Ti-Si (0.25, 0.5 and 1wt%), Ti-Al (1, 4, 11, 19 wt%) of these particular binary titanium alloys. The oxidation resistance of these alloys was studied in air (atmospheric pressure) and pure oxygen (100 torr) atmospheres at 500-750 ° C for several hundred to several thousand hours. The oxidation kinetics of the alloys were investigated by continuous pyrolysis gravimetric or intermittent sample weighing. The study found that these three alloying elements have very different effects on the oxidation behavior of titanium: silicon and aluminum reduce the oxidation rate; the impact of chromium on the oxidation rate is more complicated, depending on the amount of addition, when the chromium content is about 4 wt% , There is a strong adverse effect. In addition to the differences found in pyrolysis gravimetric measurements, morphological observations also show that these elements significantly affect the oxide layer structure and adhesion. To illustrate the role of these elements, we investigated, compared, and discussed the possibilities of adding silicon, aluminum, and chromium to improve the mechanical and physicochemical properties of titanium oxides.