铸钢件生产中选用保温冒口套的方法

铸钢件生产中选用普通砂型冒口时，铸件工艺出品率低，冒口重量要占铸件重量的60-80％。目前设法减小冒口尺寸、提高冒口的有效利用率方法很多。我们陕西压延设备厂采用常熟保温耐火材料厂生产的纤维复合型保温冒口套，它的特点是重量轻、耐火度高、高温线收缩率小、气孔率高、热损失小、保温性能良好。     

Microstructures and constituents of super-high strength aluminum alloy ingots made through LFEC process

Ingots of a new super-high strength Al-Zn-Mg-Cu-Zr alloy were produced respectively by low frequency electromagnetic casting (LFEC) and by conventional direct chill (DC) casting process. Microstructure and constituents of the ingots were studied. The results indicated that the LFEC process significantly refines microstructure and constituents of the alloy, and to some extent, decreases the area (or volume) fraction of constituents and eutectic structure precipitated at grain boundaries. But, no difference in the type of constituents was observed between LFEC and DC ingots. The results also showed LFEC process can improve the as-cast mechanical properties.     

浅谈铸造企业节能措施

能源短缺已成为当今世界的重大问题之一，各国对能源问题都给予了极大的关注，合理利用能源，降低能耗被列为经济发展的重大课题。我国目前能源的利用水平远低于发达国家，节能工作基础还很薄弱，节能潜力很大。目前我国机械产品消耗的能源占全国总能源的65％。而铸造行业是国民经济中能耗能较多的行业之一，占机械工业总耗能的25-30％，能源平均利用率为17％，铸造生产的能耗约为发达国家的2倍。我国每生产1吨合格铸铁件的能耗为550—700kg标准煤，国外仅为300-400kg；每生产1吨合格铸钢件的能耗为800-1000kg标准煤，而国外为500-800kg；我国铸件重量比国外平均重10％-20％，加工余量大1-3倍；我国铸钢件工艺出品率平均为50％，国外达70％。加入WTO后我们面临着一个竞争激烈的铸件市场。因此，大力抓好节能增效是我国铸造行业增强竞争力的重要措施。[第一段]     

蠕墨铸铁生产中蠕化率的控制

讨论炉料、化学成分、蠕化剂质量、处理后包内保留时间和温度对蠕墨铸铁蠕化率的影响。介绍如何控制、检测蠕化率，并对如何防止蠕化衰退提出建议。实践表明，蠕化率可以稳定在55％-85％的范围内。     

新型纳米分散剂提高醇基涂料悬浮稳定性的研究

对用新型纳米分散剂提高醇基涂料悬浮稳定性进行了研究 ,试验结果表明 ,只有新型纳米分散剂和有机助剂配合使用 ,才可取得明显的悬浮效果 ,醇基涂料的 2h、 2 4h、 48h和 72h悬浮率分别达到 99%、 98%、 96 %和 94%。这种醇基涂料还具有强度高、发气量低、涂刷性好和点火不起泡等特点。     

Effects of carbon content and solidification rate on thermal conductivity of grey cast iron

The thermal conductivity or diffusivity of pearlitic grey irons with various carbon contents is investigated by the laser flash method. The materials are cast in controlled thermal environments and produced in three dissimilar cooling rates. The cooling rate together with the carbon content largely influence the thermal conductivity of grey iron. Linear relationships exist between the thermal conductivity and the carbon content, the carbon equivalent and the fraction of former primary solidified austenite transformed into pearlite. The work shows that optimal thermal transport properties are obtained at medium cooling rates. Equations describing the thermal conductivity of pearlite,solidified as pre-eutectic austenite, and the eutectic of grey iron are derived. The thermal conductivity of pearlitic grey iron is modeled at both room temperature and elevated temperature with good accuracy.     

热轧态Cu-Fe-P合金的相变动力学研究

通过对热轧态Cu—2．5％Fe—0．03％P—0．1％Zn合金导电率与析出的第二相体积分数之间的变化关系的测定与分析，研究了该合金的相变动力学。由合金在不同温度时效时的导电率实验数据确定了该合金的相变动力学方程的系数，从而描绘出不同温度时效时的相变动力学“S”曲线以及等温转变TTT曲线。     

Effect of cooling rate on the microstructure of electron beam welded joints of two-phase TiAl-based alloy

The analysis of the microstructural characterization and phase composition of electron beam welded joint zones of Ti- 43Al-9V-O. 3Y alloy has been done in this study. The welded seam is mainly composed of B2 phase, the partial γ ＋ α2 twophase lamellar structure and granular γm phase. And the lanthanon Y existed as YAl2 phase and served as grain refined. The impact of different cooling rates on joint microstructure, fracture characteristic and tensile strength were investigated. The high cooling rate restrained the structural transformation and resulted in the ordering structure. The fracture of the joint was brittle cleavage fracture because the ordering structure went against restraining the crack propagation. With the decrease of cooling rate, the transformation amounts of lamellar structure increased, and the fracture presented the layered and crosslayered characteristic.     

Al2O3对CaO-Al2O3-SiO2-Na2O系微晶玻璃结构与性能的影响

利用烧结法工艺制备CaO—Al2O3-SiO2-Na2O系微晶玻璃，通过DTA、XRD、IR和SEM等分析手段，系统研究Al2O3对CaO-Al2O3-SiO2-Na2O系微晶玻璃的结晶温度、晶体结构以及性能的影响。研究表明：随着Al2O3质量分数升高，初始析晶温度升高，晶体尺寸增大、析晶率升高，微晶玻璃的表观体积密度、显微硬度和抗折强度呈先增加后降低的趋势。在本实验条件下，最佳的Al2O3质量分数为11．77％。