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粉末注射成形不锈钢--制取工艺、性能、应用-- 总被引:10,自引:6,他引:4
讨论了粉末注射成形可以制备哪些不锈钢;现在用粉末注射成形已能制备哪些不锈钢;在制备这些不锈钢时哪些工艺应特别予以关注.由这些不锈钢制成的MIM零件所能达到的磁性能、力学性能和耐腐蚀性能.最后,提供了这些不锈钢的选用准则和一些应用实例. 相似文献
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美国金属粉末工业联合会将出版2 0 0 3年金属注射成形新版标准,新版标准不仅包括更多的有关MIM 17 4PH材料和MIM 4 30不锈钢的性能标准,还增加了牌号为MIM 4 2 0的不锈钢新产品。新版标准还将增加2种新的测试方法,这两种方法分别是:测量金属注射成形材料抗硫酸腐蚀的试验方法和使用比重计测量金属注射成形制品密度的方法。有关金属注射成形材料新试验数据的获得和新标准的起草工作仍在进行中,美国金属注射成形标准委员会已经委托有关实验室对MIM F 15合金的线胀系数、抗拉性能、杨氏模量及泊松比进行了测量,美国金属注射成形标准委员… 相似文献
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本文介绍了金属粉末注射成形 (MIM)零件的先进热加工工艺及设备。由于MIM Mas ter系列设备具有连续脱粘 高温烧结及快速冷却功能 ,可在大规模生产时加强工艺参数的控制 ,改善产品质量。最后把高温烧结和快速冷却组成一个连续过程 ,能实现MIM零件烧成品的硬化。快速冷却的独特优点是在分解氨气氛中烧结 316L不锈钢可提高其密度 ,并可以采用可靠而价廉的气氛以降低成本 相似文献
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《粉末冶金材料科学与工程》2015,(6)
在316L不锈钢粉末中添加Cr_2N粉末,采用粉末注射成形工艺制备Cr_2N增强奥氏体不锈钢,利用扫描电镜观察与能谱分析以及洛氏硬度测定,研究Cr_2N对MIM 316L不锈钢组织、成分与硬度的影响,并通过中性盐雾试验研究Cr_2N对MIM316L不锈钢抗腐蚀性能的影响。结果表明,316L不锈钢中添加Cr_2N后,显微组织仍为典型的奥氏体组织,材料的密度与硬度都有所提高。Cr_2N添加量为3%时,不锈钢硬度由64.5 HRB提升至78HRB,并且不会导致抗腐蚀性能下降。 相似文献
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注射成形含氮无镍不锈钢的研究 总被引:1,自引:0,他引:1
为了扩大不锈钢的应用范围与节省较昂贵的镍资源,笔者以粒径<38.5μm含氮不锈钢粉末和多组元粘结剂(PW,HDPE,SA)为原料,采用粉末注射成形工艺制备了0Cr17Mn12Mo2N含氮无镍奥氏体不锈钢材料,并对其表面状态与显微组织、拉伸断口形貌以及力学性能、耐蚀性能进行了分析与测试.结果表明:使用上述粘结剂能够成功地实现含氮不锈钢粉末的注射成形;在流动N2气氛中,0.1MPa,1340℃下烧结120min,再经热处理后,注射成形0Cr17Mn12Mo2N不锈钢烧结体的相对密度可达到97.6%,含氮量达到0.83%(质量分数).该含氮无镍不锈钢具有良好的强度和塑性:抗拉强度σb=910MPa,屈服强度σ0.2=560MPa,伸长率δ5=46%,断面收缩率Ф=39.5%,硬度(HRB)为91.7,各项性能指标均优异于MIM 316L不锈钢. 相似文献
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Fe-2Ni金属注射成形工艺研究 总被引:2,自引:0,他引:2
采用金属粉末注射成形工艺(MIM)制备Fe-2Ni合金。选择了5种石蜡基粘结剂,结果表明,由多组元聚合物组成的粘结剂注射成形性能好,热脱脂后无缺陷,样品形状保持完整。列举最佳工艺参数及烧结合金的机械性能。 相似文献
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磁性材料注射成形技术 总被引:2,自引:0,他引:2
概括了金属粉末注射成形技术(MIM)制造粘结永磁和烧结磁体的特点和优点。详细介绍MIM粘结永磁和烧结磁体的基本工艺过程及基本要求。综述了注射成形磁性材料的主要研究与发展方向。最后指出磁性材料注射成形技术的研究意义。 相似文献
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Modified metal injection moulding process of 316L stainless steel powders using thermosetting binder
《粉末冶金学》2013,56(3):233-237
AbstractA modified metal injection moulding (MIM) process of 316L stainless steels powders using an acrylic thermosetting resin has been developed. Gas and water atomised 316L powders were used. In order to optimise the mixing and moulding steps, different volume fractions of the two components were investigated. Mixing of metal powder and binder was carried out at room temperature and immediately moulding was performed by pouring the slurry in the moulds. It was then heated at 90°C to permit the polymerisation and cross linking of the resin. Different heating cycles, rates, and atmospheres were studied by means of thermogravimetrical analysis. The data obtained were used to establish the best debinding cycle. The debound samples were sintered at different temperatures and high densities (98% of theoretical) were obtained. Materials in as moulded (green part), debound (brown part), and sintered conditions were examined by means of SEM. 相似文献
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铁素体不锈钢中Cr元素对其耐腐蚀性能起着非常重要的作用。本文采用实验室冷凝液腐蚀实验方法,对一系列汽车排气系统用铁素体不锈钢在实验室模拟冷凝液中的腐蚀性能进行了研究。所有钢种经过10周期的实验室冷凝液腐蚀实验后,研究结果表明:Cr当量高于17%的铁素体不锈钢与含17%Cr的铁素体不锈钢耐实验室冷凝液腐蚀性能相当,且平均腐蚀失重量均小于6g/m2,平均最大腐蚀深度均小于0.03mm。在此实验结果的基础上,对新开发的439M型铁素体不锈钢和409L型铁素体不锈钢进一步开展5周期、10周期、20周期的实验室冷凝液腐蚀实验,并使用极值分析方法对三种周期冷凝液腐蚀实验后样品的最大点蚀深度进行统计分析,研究结果表明,新开发的439M型铁素体不锈钢的预测寿命是409L的1.6倍。 相似文献
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Nickel-containing stainless steels have been widely applied in watch and jewelry production,and their responses to the Nickel Directive become a universal concern in the industry.The nickel release rates and corrosion behaviors of types 316 L,304,303 and 201stainless steels under the conditions of solid solution and mirror polishing were studied by artificial sweat soaking and electrochemical methods.The results show that the weekly nickel release rates in artificial sweat do not strictly correspond to the nickel contents,which present a descending order as 303 stainless steel of 2.06μg/cm2,201 stainless steel of 1.51μg/cm2,304 stainless steel of 0.08μg/cm2 and 316 L stainless steel of 0.02μg/cm2.Both the nickel release rates of type 303 and 201stainless steels significantly exceed the threshold values regulated in EN1811∶2011;therefore,they should be avoided to be used as watch and jewelry materials owing to the risk of nickel sensitization.The nickel release rates of 316 Land 304stainless steels meet the requirements of the standard.Sulfide inclusions in stainless steel become the sources of pitting and exacerbate the damage of the passivation membrane,which is the significant cause to enhance the nickel release rates. 相似文献