New Methanol Catalyst Production Line Commissioned at Tianke

Sichuan Tianyi Science ＆ Technology Shareholding Company （hereinafter referred to as “Tianke Shareholding”）, which was established based on the Southwest Chemical Research Institute, has successfully started the commissioning of a production line for manufacture of the copper based catalyst for methanol synthesis, which was constructed by means of the self-owned technology. Testing has shown that the activity, selectivity and thermal stability of the XNC-9 catalyst are on a par with those of similar overseas catalysts. By now the total output of the copper-based catalyst at Tianke Shareholding has been increased to 1000 t/a, which can meet the domestic and overseas demand for the methanol synthesis catalyst.     

Nucleation Mechanism for Bainite

Based on the experimental results that solute-depleted zone was observed in Cu-28Zn-4AI (mass fraction) at 523 K, AG is calculated as a positive according to the thermodynamic criteria for the spinodal decomposition of a ternary systems. So, the solute-depleted zone cannot be formed by spinodal decomposition. Dislocation density required by the formation of solute-depleted zone is estimated greater than 7.89×109 cm-2, according to the segregation of solute atoms around dislocations, which is not consistent with the practical situation for the alloy at 523 K. Associated with the internal friction experimental fact that internal friction peaks appear within the incubation for bainitic transformation in Cu-Zn-AI alloy, the equilibrium temperature, TO, is evaluated as 433 K for solute-depleted Cu-25Zn-3.4AI, which is lower than the experimental temperature 523 K. Thus, nucleation by shear mechanism is impossible in this circumstance. Therefore, it is concluded that, like bainite in steels and Ag-Cd, bainite in     

铜基镍镀层的化学退除

一、前言镀层的退除可以分为化学退除和电化学退除两大类。与电化学退除相比,化学退除具有操作方便、设备简单、节约时间、提高工效等优点。因此,本文就铜基镍镀层化学退除法作一讨论。本退除法具有如下特点: 1.既适用于铜基亦适用于铁基多层镀镍件。     

铜基粉体材料种类、特性、用途介绍

目前，我国宝铜基粉体材料应用正日益广泛，铜基粉体材料包括电解铜粉、低松装密度水雾化铜粉、铜合金粉、氧化铜粉、纳米铜粉和喷涂用抗氧化仿金铜合金粉等六大类，特性、用途也不尽相同。[第一段]     

我国铁粉、铜及铜合金粉生产状况

铁粉（含合金钢粉）、铜粉（含铜合金粉）作为工业的主要原材料，广泛地应用在机械、冶金、化工、航空航天材料领域。其世界每年总用量已超过100万吨。制成的粉末冶金零件近90万吨，销售额超过75亿美元。铁基、铜基粉末是粉末冶金工业的基础原材料，它的产量、品质决定着粉末冶金工业的发展。汽车工业的发展刺激并拉动了粉末冶金工业的发展。     

颗粒增强铜基热沉复合材料的研制

本文研究了用常规粉末冶金工艺制备颗粒增强铜基热沉复合材料的机械物理性能，研究结果表明，采用W和Al2O3颗粒增强铜基热沉复合材料，可以有效地改善烧结铜材料的硬度和抗拉强度，提高抗高温回复性能；W颗粒增强铜基热沉复合材料比Al2O3颗粒增强铜基热沉复合材料的热导率要高。     

WC对铜基和镍基喷焊覆层材料耐气蚀性能的影响

在CuNiSiB,NiCrSiB自熔合金粉末中添加WC陶瓷颗粒，利用氧乙炔焰粉末喷焊工艺制备覆层材料，用超声波振动气蚀仪对覆层材料进行耐气蚀性能研究，用扫描电子显微镜对覆层材料表面气蚀破坏形貌进行观察，结果表明：复合覆层材料的耐气蚀能力比基体强；提高CuNiSiB覆层材料耐气蚀能力的途径是强化晶界，还探讨了覆层材料的气蚀破坏机理。