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对硬质合金注射成形技术的基本原理和工艺,硬质合金注射成形技术的特点和应用,以及粘结剂、注射压力、注射温度、注射速度、模具温度等因素对注射成形压坯的影响进行了综述. 相似文献
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傅小明 《广东有色金属学报》2004,14(2):132-134
对硬质合金注射成形技术的基本原理和工艺,硬质合金注射成形技术的特点和应用,以及粘结剂、注射压力、注射温度、注射速度、模具温度等因素对注射成形压坯的影响进行了综述。 相似文献
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粉末粒度和充填量在金属粉末注射成形(MIM)工艺过程中起着重要的作用.本文用不同粒度的氢化-脱氢钛粉,进行了多种充填量的MIM工艺试验.粒度为14.10μm的钛粉,充填量50%,可成形性好,相对密度可达97.8%. 相似文献
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设计了一种金属注射成形30Cr13Cu4不锈钢材料,研究了热处理工艺参数(时效处理温度和保温时间)对材料组织及性能的影响。结果表明:含Cu金属粉末注射成形的合金组织均匀,相对密度为97.9%;随着时效温度的提高,基体上析出的碳化物数量增加并长大,而析出的球形纳米ε-Cu相转变成短棒状,材料的硬度先增加后降低;在520℃下进行时效处理时,随着保温时间的延长,合金的硬度不断提高,保温14 h后合金硬度为327 HV,析出弥散分布的ε-Cu析出相对合金硬度提高作用明显。 相似文献
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粉末粒度和填充量对钛注射成形工艺的影响 总被引:2,自引:0,他引:2
粉末粒度和充填量在金属粉末注射成形(MIM)工艺过程中起着重要的作用。本文用不同粒度的氢化-脱氢钛粉,进行了多种充填量的MIM工艺试验,粒度为14.10μm的钛粉,充填量50%,可成形性好,相对密度可达97.8%。 相似文献
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注射成形Kovar合金蜡基粘结剂的优化 总被引:5,自引:0,他引:5
表征MIM喂料流变学性能的主要指标是喂料的粘度及粘度对应变和温度的敏感性,这些指标可统一用MIM喂料综合流变学因子进行评价。本文运用该评价因子研究了几种不同配方粘结剂的Kovar合金喂料的流变性能,并通过成形生坯强度和产品浇口痕迹进行综合比较,选择了一种最优的注射成形Kovar合金蜡基粘结剂。 相似文献
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《Minerals Engineering》2003,16(11):1091-1101
The Jameson Cell concept was developed by Graeme Jameson of the University of Newcastle and the technology was developed for commercial application by Mount Isa Mines Limited (MIM). Laboratory investigations highlighted significant differences between Jameson Cells and other flotation technologies. The installation of Jameson Cells in MIM’s copper concentrator in 2002 has allowed a detailed investigation of Jameson Cell fundamentals to be conducted within a mineral flotation system. On line measurements, together with non-invasive measurement techniques for detailing operation within the primary contacting zone (the downcomer) and the secondary contacting zone (the tank) has allowed a detailed review of Jameson Cell operation to be conducted. This paper shows that assumptions based on mechanical flotation cells, conventional and non-conventional flotation columns and even pneumatic flotation devices do not necessarily transfer to the Jameson Cell. The effects of feed flow rate, feed percent solids, froth depth and aeration rate are discussed in relation to the Jameson Cell downcomer residence time. Aeration effects within the Jameson Cell tank are also discussed. 相似文献
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《Minerals Engineering》2002,15(4):297-299
Ten surveys of the ball milling circuit at the Mt Isa Mines (MIM) Copper Concentrator were conducted aiming to identify any changes in slurry rheology caused by the use of chrome balls charge, and the associated effect on grinding performance. Slurry rheology was measured using an on-line viscometer. The data were mass balanced and analysed with statistical tools.Comparison of the rheogram demonstrated that slurry density and fines content affected slurry rheology significantly, while the effect of the chrome ball charge being negligible. Statistical analysis showed the effects of mill throughput and cyclone efficiency on the Grinding Index (a term describing the overall breakage). There was no difference in the Grinding Index between using the chrome ball charge and the ordinary steel ball charge. 相似文献
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采用高压水气联合雾化粉末和热塑性粘结剂制备的金属注射成型17-4PH不锈钢,经过真空烧结以及热处理后,对其进行硬度检测、金相分析以及盐雾试验等.结果表明:MIM 17-4PH不锈钢烧结组织主要由板条马氏体和块状铁素体组成,硬度为24HRC,盐雾试验12h出现腐蚀斑点;经过1040℃固溶处理后,材料硬度增至29HRC,盐雾腐蚀24h未出现腐蚀斑点;烧结后直接进行480℃时效,第二相粒子析出并弥散分布在基体中,材料硬度提高到38HRC,但盐雾腐蚀8h就出现腐蚀斑点. 相似文献
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离子型稀土开采先后经历了池浸、堆浸和原地浸出,目前广泛采用原地浸矿法,预测和适时调控原地浸矿中溶质运移过程是实施离子型稀土科学化和精准化开采的重要内容。总结了近年来土壤溶质运移几何模型,包括活塞流模型、单毛管模型、毛管束模型,归纳了土壤溶质迁移数学模型,包括对流弥散方程(CDE)、动水—不动水(MIM)模型、随机模型和传递函数模型(TFM),分析了各种模型的特点及在离子型稀土溶质运移的适用性;探讨了色谱塔板理论模型、地理信息系统应用模型、人工神经网络分析离子型稀土溶质运移的可行性,为揭示离子型稀土浸取过程的溶质迁移规律提供思路,有助于进一步完善离子型稀土原地浸矿理论体系。最后提出了离子型稀土溶质运移问题研究可能的发展趋势,为后续研究指明了方向。 相似文献