共查询到18条相似文献,搜索用时 859 毫秒
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通过密炼机混炼出不同比例金属粉末与粘结剂的金属喂料,对不同配比的金属喂料进行喂料流动性能对比实验,得到最佳注塑成型实验所用的最佳喂料配方,不锈钢粉末占不锈钢喂料质量分数为92.6%时,不锈钢喂料综合性能较好;利用所确定的喂料配方和已加工好的椎间融合器模具在阿博格精密注塑机上进行性能测试,分别控制注塑喂料温度、模具温度、注射压力进行椎间融合器的注射,并对注射结果进行重量测量及注射时间记录,分析出此种配方最适合的注射工艺条件。结果表明:最佳注射工艺参数为:模具温度:50℃;注射压力:70MPa;喂料温度180℃,且用注塑机控制四段加热区间:180/175/170/165℃。 相似文献
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基于316L不锈钢粉末与高分子材料配方,首先利用开炼机对配方材料进行充分混炼,粉碎、干燥后,制备出大小相对均匀的物料混合物颗粒。然后利用自主研制的粉体喂料3D打印机,对金属坯体进行3D打印,随后采用溶剂脱脂法对金属胚体进行脱脂,最后对其进行烧结实验,研究在不同烧结工艺条件下所得试样的物理机械性能,由此分析确定最佳的烧结工艺。结果表明,随烧结温度升高,烧结制品的致密化程度逐步增加,各项物理机械性能也逐步提高,在1370℃烧结工艺条件下,所得金属制品各项物理机械性能最佳,且和传统粉末冶金制品相接近,其烧结密度达7.43 g/cm3,抗拉强度达501.2 MPa,冲击位移达4.54 mm,延伸率达27.1%,抗弯曲力达16.54 KN ,硬度达80.74 HRB。同时,通过微观对比、机理分析及实验验证,印证了1370℃为最佳的烧结工艺,烧结制品具有成分均匀、组织细小和性能稳定等优点。 相似文献
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本文从合金化、成份、组织、结构、冶金方法和固溶处理的温度。冷却条件等九个方面分析了影响316L型尿素用不锈钢在休伊试验中耐蚀性的因素。文章列举试验数据证明在诸因素中,固溶处理对316L不锈钢耐蚀性有决定性影响。试验表明,非敏化态316L不锈钢抗晶间腐蚀性能差与固溶缓冷时,磷、硅在晶界的析出和偏聚有关。通过固溶水淬改善316L不锈钢的耐蚀性,已用于生产,固溶水淬的316L不锈钢具有最佳的耐蚀性。本文列举的一系列试验数据和晶间腐蚀机理分析,为当前大型尿素生产装置选材、腐蚀原因分析,提供了参考。 相似文献
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Lei Zhao Maurice N. Collins Colin Birkinshaw 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2009,84(3):454-460
BACKGROUND: The powder reaction moulding process uses a reactive monomer as carrier and binder for the moulding of metal or ceramic powders. De‐binding is achieved using thermal depolymerisation which is followed by sintering to give the finished component. Binder can be recovered for re‐use. RESULTS: Moulding compounds, with various powder volume fractions, have been prepared using stainless steel, silicon nitride and alumina with n‐butyl cyanoacrylate as binder, and the stability of the compounds established. Rheological properties of the compounds have been measured using both pressure flow and drag flow methods. Compounds are strongly pseudoplastic. Comparison of experimental results with theoretical models, describing suspension flow behaviour shows that experimental maximum volume fractions are close to the theoretical volume fraction of 0.42 for silicon nitride, 0.68 for alumina and 0.7 for stainless steel. Differential scanning calorimetry and thermogravimetry have been used to simulate de‐binding and show a rapid loss of binder through depolymerisation. Post‐sintering porosity of the ceramic materials is high but this is thought to arise from the low pressure moulding techniques used. Porosity of the stainless steel mouldings is much lower. CONCLUSIONS: The results validate the powder reaction moulding idea and demonstrate applicability to three widely different powder materials. Copyright © 2008 Society of Chemical Industry 相似文献
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采用四因素三水平L9(34)正交试验方法研发了适用于马氏体不锈钢手术器械的柠檬酸系基础钝化工艺,并进一步实验选取了螯合剂的最佳配方,采用压力蒸汽试验、氯化钠溶液试验测试评估了马氏体不锈钢手术器械钝化膜的耐蚀性。结果表明,优选出的钝化溶液配方和工艺为:20%柠檬酸、2%氧化剂、2%螯合剂,θ为45℃,钝化t为38 min。此工艺配方可满足马氏体不锈钢手术器械耐腐蚀性能要求,作为优选的清洁生产工艺可替代污染严重的硝酸钝化工艺。 相似文献
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Kyehwan Lee Manuel de Hoyos Rajiv Nambiar Miguel A. Gonzalez Randall M. German 《Powder Technology》2010,200(3):128-135
Parts of polypropylene and of a stainless steel powder feedstock were molded by means of gas-assisted injection molding in epoxy cavities made by stereolithography. The design of the experiment method using the Taguchi L9 array was implemented to test the effect of gas pressure, gas delay time, shot size and melt temperature on gas penetration depth and residual wall thickness. Simulations were conducted and compared with direct experimentation. Simulation predicted that the shot size was the only significant factor when processing polypropylene and the powder metal feedstock. The experiment showed that shot size and gas delay time were significant when processing polypropylene; and shot size, gas pressure, and melt temperature were significant factors when processing the powder metal feedstock. The residual wall thickness could not be controlled by the processing variables used in this study as the S/N ratios calculated were very small. 相似文献
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不锈钢中空纤维膜基膜孔径大,直接涂覆分离层容易产生表面缺陷。在二氧化钛悬浮液中加入聚乙烯醇作为黏结剂,通过真空辅助抽滤法在不锈钢中空纤维基膜表面形成一层均匀的分离层。通过高温烧结得到了TiO2/不锈钢中空纤维复合膜,考察了烧结温度对于TiO2/不锈钢中空纤维复合膜表面分离层形貌和结构的影响。不同烧结温度时,TiO2/不锈钢中空纤维复合膜的表面形貌有所差异;随着烧结温度的升高,不锈钢复合膜的孔径和纯水通量均先升高再下降。当烧结温度为500℃时,表面涂层均匀,孔径分布集中,水通量较高。最后,以SPT-500膜测试了水包油乳液分离效果,分离效率达到99%以上,且具有良好的抗污染性能。 相似文献
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通过研究不锈钢酸洗废水体系中氟离子脱除和金属离子沉淀的规律,开发了钙钠协同沉淀新工艺,并对新工艺产生的污泥于1200℃下进行还原,细磨、磁选后得铁、铬、镍合金粉末和再生萤石矿。结果表明,该工艺实现了废水的达标排放,污泥产生量减少了14.79%,实现了铁铬镍的金属化还原,得到了再生萤石矿和金属品位93.62%的合金粉末,合金粉末中铁、铬、镍品位分别达69.31%, 7.60%和16.71%,回收率分别高达95.30%, 88.70%和97.53%。 相似文献