摘要：采用基于TIG三丝电弧增材制造系统,通过提前对增材构件进行成分设计,选择增材目标成分为7050铝合金,确定了三丝的送丝速率。系统探究了平均脉冲电流与沉积速度在3 mm厚5A06薄板下单层单道成形的影响规律,并找到了成形较好的工艺区间。在该工艺区间内进一步探究了不同脉冲电流与沉积速度对多层单道成形的影响规律。结果表明,随着脉冲电流逐渐增加,沉积构件宽度随之增加,层高减小;而随着沉积速度逐渐增加,沉积构件宽度与层高都随之减小。

摘要：通过对SL6600A客车原传动夹角的校核和重新设计，介绍了一种计算机计算传动夹角的方法，用该方法优选，确定出的传动夹角参数，符合汽车设计要求，能保证汽车在整个工作范围内，传动轴可靠平衡地传递动力。

摘要：针对我国铝土矿高硅高铝,溶出困难的特点,着重研究碱法即拜耳法高温溶出铝土矿制备铝酸钠溶液的工艺过程。分别选用某铝厂母液和碱溶液浸出铝土矿,改变苛性碱浓度、温度、时间、液固比和矿石粒度,分析各因素对铝土矿中Al2O3的溶出率的影响,从而得到最佳的溶出条件。

摘要：The mechanism of oxygen pressure acid leaching of sphalerite catalyzed by Fe^3+/Fe^2+self-precipitation was investigated in this *** sphalerite was fabricated with varying amounts of iron content via the sintering of ZnS and FeS and used for the pressure acid leaching *** variations in the potential of the pressure leaching system were investigated by using a self-designed potential *** results showed that compared to the non-iron sphalerite,there was a violent redox reaction between the 25.70%Fe-artificial sphalerite and dissolved oxygen during the process of pressure leaching;and the catalytic mechanism was attributed to the redox couple Fe^3+/Fe^2+,where Fe3+oxidizes the H2S gas film and the reduced Fe2+state is subsequently oxidized by the dissolved ***,the effect of temperature,H2SO4 concentration,and oxygen partial pressure on the artificial sphalerite with different iron contents was *** sphalerite samples with iron content were observed to dissolve more easily in sulfuric acid compared to the non-iron ***,the activation energy of artificial sphalerite was observed to be lower in the sample with 25.70%iron content(22.26 kJ/mol)compared to that with no iron(32.31 kJ/mol);and the apparent reaction orders were obtained with respect to H2SO4 concentration(1.10 and 1.36)and oxygen partial pressure(1.29 and 1.41),respectively.A comprehensive kinetic model was developed on the basis of the experimental data and the fitted leaching ratio plot;and the kinetic equations for the leaching of sphalerite catalyzed by Fe^3+/Fe^2+self-precipitation were determined.