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在稀土合金对坯材质量影响的研究中,从钢水包连续浇注各种碳素合金钢(15、45、y8及9Xφ)时,向钢水内加入稀土合金。所用的铈铁合金、硅混合稀土金属的合金及硅镧合金的量为0.02—0.10%,并且稀土回收率达70国—90%。稀土合金的作用为:可减小偏析及轴向气孔率、使定向结晶带变狭窄、使等轴品带变宽、并且使树枝状晶体的厚度从1.5减小到0.5毫 相似文献
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对电解法制取铝钛硼稀土中间合金进行了理论分析,在不改变铝电解生产的条件下试制了铝钛硼稀土中间合金,并对工业纯铝进行了晶粒细化试验,结果能使晶粒细化到平均直径d=0.21mm。 相似文献
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技术中心铝锌硅稀土合金产品研制成功据了解,铝锌硅稀土合金产品成为热浸镀锌行业的一个发展方向。自2007年起,中冶葫芦岛有色金属集团公司技术中心将铝锌硅稀土合金产品开发作为重点攻关课题,并利用现有生产条件进行试验,攻克技术难关,日前,成功研发出合格的铝锌硅稀土合金产品。前不久,该中心签定了2000t铝锌硅合金产品供货协议。 相似文献
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稀土和磷复合变质对过共晶铝——硅合金硅晶体形貌与力学性能的影响 总被引:15,自引:0,他引:15
采用扫描电镜、X射线衍射、材料性能检测等实验手段对复合变质处理后的过共晶铝硅合金显微组织、形貌和力学性能进行了分析。结果表明:磷和稀土复合变质后,使粗大块状、条状的初晶硅的尺寸明显缩小且棱角钝化;较大针状的共晶硅变为颗粒状,使显微组织明显细化,从而导致过共晶铝硅合金的力学性能显著提高。 相似文献
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文章介绍了添加微量稀土钇和硅对银合金物理性能的影响.微量硅元素的加入改善了银合金的铸造性,细化了合金组织,显著提高铸态合金的硬度.稀土元素钇的加入细化了银合金组织,在银中加入钇,实现固溶强化.含量为0.03%的添加量在实验中表现最佳. 相似文献
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本文研究了稀土变质处理对改善铸造镍基合金的组织和耐蚀性能与铸造性能的影响。试验结果表明,在这种镍基耐蚀合金中加入适量的稀土可明显地细化合金的晶粒,改变碳化物与夹杂物的形态与分布,提高合金的耐蚀性能,使其铸造性能亦有所改善。 相似文献
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稀土变质处理高硅铸铁的研究与应用 总被引:2,自引:0,他引:2
研究了稀土对高硅铸铁的组织与性能的影响,试验结果表明:在高硅铸铁中添加适量的稀土,可使石墨由晶间网状或片状集分布变为弥散的颗粒状均匀分布,并使其组织细化与无效化,因此,明显地提高了高硅铸铁的机械性能,耐蚀性能和铸造性能。 相似文献
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孔凡校 《有色金属(冶炼部分)》2011,(12):46-49
采用P、Sr、混合RE对含Si量22%~26%的过共晶铝硅合金进行变质处理,利用金相显微镜分析了单一元素变质及复合变质对合金初晶硅和共晶硅组织形态的影响。结果表明,P为初晶硅变质元素,Sr为共晶硅变质元素,RE能同时细化初晶硅和共晶硅;试验发现Sr虽然不能细化初晶硅,但对初晶硅有明显的裂解作用;P和RE复合变质使得初晶硅尺寸减小到25μm,而加入Sr后,由于Sr对初晶硅的裂解作用,使得初晶硅的尺寸减小到15μm,共晶硅大部分呈蠕球杆状或团球状,均匀弥散分布;试验得到了一种初晶硅和共晶硅细化效果均良好的复合变质剂。 相似文献
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RecentlythebeneficialactionsofREonironandsteelshavebeenreportedaroundtheworld.REcannotonlydeoxidizeanddesulphurizethemeltandf... 相似文献
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屠海令 《中国稀土学报(英文版)》2004,22(5):571-575
The development of rare earths (RE) applications to semiconductor materials and devices is reviewed. The recent advances in RE doped silicon light emitting diodes (LED) and display materials are described. The various technologies of incorporating RE into semiconductor materials and devices are presented. The RE high dielectric materials, RE silicides and the phase transition of RE materials are also discussed. Finally, the paper describes the prospects of the RE application to semiconductor industry . 相似文献
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ZHANG Feng ) MA Changsong) WANG Bo) ZHANG Peili) MA Zhigang) ZHANG Yi)) Key Laboratory for Ferrous Metallurgy Resources Utilization of Ministry of Education Wuhan University of Science Technology Wuhan China) Silicon Steel Department Baoshan Iron & Steel Co. Ltd. Shanghai China) Steelmaking Plant China) Analysis & Testing Center Research Institute Shanghai China 《Baosteel Technical Research》2011,5(2):41-45
Based on the industrial production of non-oriented silicon steel,the rare earth(RE) treatment during the Ruhrstahl Heraeus(RH) refining process was studied.The morphology and the size distribution were observed for the steel specimens treated with different RE treatment conditions.Furthermore,the formation and change of the nonmetallic inclusion characteristics of finished steel sheets after the RE treatment were discussed.The results have shown that in the present work,the suitable RE metal additions are 0.6-0.9 kg/t steel.After the suitable RE treatment,the formation of AlN and MnS inclusions were restrained,and the aggregation,flotation and removal of nonmetallic inclusions were efficiently promoted and the cleanliness of liquid steel was significantly increased.Meanwhile,the total oxygen concentration reached the minimum value and the desulfurization efficiency was optimal,and the type of main inclusions was approximately spherical or elliptical spherical RE radicle inclusions whose size was relatively large. 相似文献
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The application of rare earths(RE) in the Ni saving heat resistant steel was studied by metalloscopy,scanning electron microscopy(SEM),energy dispersive spectrometer(EDS),X-ray difference(XRD).Because the diffusion of chromium was promoted by RE,a dense and adhesive Cr2O3 layer could form rapidly at the early oxidation stage,which played a effective protection role;the pinning effect of silicon dioxide was enhanced by RE in the internal oxidation layer,which had a block effect on the diffusion of metal ions and oxygen ions at later stage of oxidation and resulted in that the high temperature oxidation rate of RE heat resistant steel was decreased. 相似文献
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刘技文 《有色金属材料与工程》1993,(5)
本文研究了稀土含量和时效处理对铜铬锆合金性能的影响。结果表明:稀土含量增加,合金的硬度、晶粒尺寸增大,适量的稀土含量可提高合金的导电率。时效温度增加,合金的导电率提高,但对合金硬度的影响有个最佳值。最后还给出了最佳的热处理工艺。 相似文献
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稀土对耐热钢高温性能的影响 总被引:2,自引:0,他引:2
通过对真空持久试样断口表面的离子探针分析,证明稀土偏聚晶界,增加了晶界的强度,改善了钢的热强性和热塑性。用同位素方法试验表明,稀土提高了钢中铬的扩散速度,促进了Cr_2O_3保护膜的形成。用SEM、EDEX、ICP及X光等方法对合金表面氧化皮进行的研究表明,钢中加入稀土改变了氧化皮结构,细化了晶粒,抑制或延缓了氧化皮与基体界面空洞的形成,使氧化皮不易开裂和脱落,改善了钢抗氧化性。 相似文献