蓝宝石晶片机械化学研磨抛光新方法研究

以SiO2为磨料,同时将MgF2微粉作为固相反应催化剂加入到SiO2磨料中,利用蓝宝石和SiO2之间的固相反应,通过去除生成的软质反应层的方法,对蓝宝石晶片进行机械化学研磨抛光,在获得良好的表面加工质量的同时,提高蓝宝石晶片加工效率。  

基于ANSYS的热板温度场模拟与优化设计

针对热板表面温差偏大问题进行三维有限元温度场分析,用参数化设计语言(APDL)编写优化分析文件,再调用ANSYS的优化设计模块,采用综合优化法对热管间距和热管功率进行优化分析。结果显示,优化方案较原设计方案热板表面最大温差降低61%,效果显著,为优化热板温度场提供一种快速、科学的方法。  

Preparation of pure SbCl3 from lead anode slime bearing high antimony and low silver

A novel treatment process of lead anode slime bearing high antimony and low silver was developed by a potential-controlled chloridization leaching and continuous distillation.The experimental results show a high Sb 3+ concentration,489.2 g/L,in the leaching solution for two-stage countercurrent leaching process,and the leaching rates of Sb,Cu,Bi more than 99% when the potential is controlled at 450 mV.When the leaching solution is distillated and concentrated at 120°C,almost all the silicon compound is evaporated into the concentration distillate and exists as amorphous hydrated silica.By the continuous distillation,high pure SbCl3 could be prepared,and AsCl3 is enriched in the distillate while metals Bi,Cu are enriched in the continuous distillation residue.As a result,the recovery rate of Sb is more than 95%.  

激光熔覆Ni/SiC金属陶瓷涂层组织与耐磨性能

采用激光熔覆技术，在45钢表面对不同含量SiC（质量分数）陶瓷粉末镍基自熔性粉末进行激光熔覆，得到Ni基SiC合金涂层。对熔覆层横断面进行了显微硬度测量和显微组织分析，对各种SiC含量的熔覆层试样进行了摩擦磨损试验。结果表明，添加SiC的镍基合金涂层能够提高熔覆层的耐磨性和硬度。  

聚苯硫醚涂料和涂装工艺的改进

在研究聚苯硫醚与聚金属硅氧烷（ＰＭＳ）形成互贯网络的过程中，经ＤＴＡ和ＭＦＮ分析，选择了交联剂。通过在ＰＰＳ－ＰＭＳ共混体系中添加交联剂，流平剂等助剂，改进涂料的熔融流动特性和涂层的表面状态，应用热熔融喷涂工艺，得到一次厚涂覆５００μｍ，表面光滑，无针孔的耐腐蚀涂层，工艺时间从原先４～６ｈ缩短到１．５～２ｈ。  

低温无底釉搪瓷涂层制备及性能研究

目的制备一种低温一次烧成搪瓷涂料,并研究其性能。方法调整搪瓷配方中耐火与助熔化合物的配比,细化搪瓷粉体粒度,采用低温长烧工艺制备搪瓷涂料。通过SEM观察瓷层的微观结合形貌,考察密着性能,最后通过柠檬酸溶液处理测试其耐酸性能。结果最佳烧成工艺参数为:烧成温度780℃,烧结时间8 min。结论涂料密着性能良好,耐酸性能良好,在保证低温烧成的情况下,搪瓷涂料具备其他良好的性能。  

Influence of Surface Roughness on Rolling Contact Fatigue Behavior of Fe-Cr Alloy Coatings

Fe-Cr coating was prepared by plasma-spraying process. As-sprayed coatings were machined by grinding, lapping, or polishing processes as appropriate to get different surface roughnesses. Rolling contact fatigue (RCF) experiments were conducted using a ball-on-disk setup. RCF lifetime of the coating was calculated. The worn morphologies of the coating were observed. Results show that surface roughness obviously influences RCF behavior of the coating. The smooth coatings showed longer RCF lifetimes, and always failed by delamination. The rough coatings always failed by abrasion or spalling. The failure of smooth coatings was driven by the orthogonal shear stress and radial stress, whereas the failure of rough coatings was driven by the asperity contact.  

铝合金阳极氧化膜的耐蚀行为研究

在硫酸电解液中,采用直流稳压电源对7075铝合金进行阳极氧化处理,并对氧化后的试样进行化学镀后处理。随后对膜层的形貌、耐蚀性及腐蚀磨损性进行研究。结果表明:未封孔氧化膜有较多的孔洞、裂纹,且大小分布极不均匀;化学镀处理后的氧化膜,表层大部分孔洞及裂纹已经被镀层所覆盖和弥合;化学镀提高了氧化膜的自腐蚀电位,增加了试样的耐蚀性。  

激光表面重熔对ZrO_2-8wt%Y_2O_3热障涂层组织与抗热震性能的影响

采用等离子喷涂设备在H13热作模具钢表面制备氧化钇部分稳定的氧化锆(ZrO2-8 wt%Y2O3)热障涂层,并用CO2横流激光器对热障涂层进行表面重熔处理,并采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、热震试验等手段研究激光重熔前后热障涂层的微观结构及其抗热震性能的变化。结果表明,重熔前后涂层均由四方结构钇锆氧化物和立方相的氧化锆组成,重熔后涂层结晶度增加,晶粒有长大现象。激光重熔后涂层产生明显分层,表层组织孔隙和裂纹明显减少,裂纹呈网状且沿晶界分布,重熔涂层内部仍保持等离子喷涂典型结构。激光重熔后涂层孔隙率降低了67%,涂层的抗热震性能也显著提高。  

薄壁塑件成型工艺参数优化

利用Moldflow软件对薄壁塑件产生翘曲的原因进行分析,采用正交试验设计方法对塑件成型的注射时间、熔体温度、保压压力、保压时间、冷却时间等工艺参数进行模拟分析,研究各工艺参数对塑件翘曲的影响,从而获得最优工艺参数组合,指导生产。