K. MUller
金属学报(英文版)
Hot working steels have been used as die materials for hot extrusion of aluminium.Due to tribological interaction at elevated temperature between the die bearing and thesurface of extruded aluminium profiles, not only the surface quality of the extrudedproduct, but also the lifetime of the dies decreases. Deposition of TiBN hard films onthe die bearing could improve the die performance. Treatment should be done in aduplex process process combining a plasma nitriding pretreatment (PN) and a plasmaassisted chemical vapour deposition (PACVD) of TiBN. In this study the influence ofthe process conditions on the properties of the duplex coatings was investigated. Therelationship between structure and mechanical property was researched. For testingthese TiBN hardfilms under elevated temperature conditions and for comparison withother possible coatings special extrusion dies with different coated bearings were used.The extrusion trials were performed on the 8MN-extrusion press at the research anddevelopment center for extrusion, Technical University of Berlin.
关键词:
hard film
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null
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null
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null
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null
林腾昌
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朱荣
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逯志方
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方宇荣
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王成杰
钢铁
为减少脱碳炉粘枪和降低终点磷含量,运用化学分析、熔点试验、Factsage热力学模拟的方法对120t双联脱碳转炉的渣系进行了研究,阐述了渣系对冶炼顺行的影响,制定了新渣系控制的基本原则和终渣成分范围.工业应用新渣系后,脱碳炉的粘枪状况得到一定缓解,脱碳转炉渣量降低至34.7kg/t,终点磷的质量分数稳定在0.006％～0.012％.
关键词:
双联法
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脱碳炉
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半钢
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渣系
杨文远
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侯春
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崔怀周
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高卫涛
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王明林
钢铁
通过水模试验的方法测量了转炉双联法在不同喷吹条件下熔池运动的基本参数.试验结果表明,脱磷炉底吹供气强度超过0.30m3/(t·min)时,增加供气量对缩短混匀时间作用不明显.熔池中有10％(质量分数)废钢时,混匀时间平均延长63％.用高供氧强度吹炼(5m3/(t·min)),脱碳的喷溅率比正常供氧量有很大提高.采用喷孔交错布置喷头和适当加大炉容比可以降低喷溅率.
关键词:
转炉
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双联法
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脱磷
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脱碳
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喷溅
孔维欢
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侯惠君
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卢德宏
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韦春贝
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张玲玲
材料导报
doi:10.11896/j.issn.1005-023X.2016.16.020
不锈钢双辉渗银处理获得的渗银层硬度较低且不耐磨,因此设计硬化方案对渗银不锈钢进行硬化,以改善其耐磨性.采用等离子氮碳共渗技术进行渗银层的改性工作,对不同工艺下膜层的微观形貌、成分及物相构成进行了分析,并对比了其硬度及磨损性能.两种硬化工艺下测得的硬度及磨损试验数据如下:渗银处理(×3 h)+渗氮碳处理(×10 h)工艺制备的试样表面硬度值为283HV0.025,15s,平均摩擦系数为0.4287,磨损失重为12.9 mg;渗氮碳处理(×10 h)+渗银处理(×3 h)工艺制备的硬度值为544HV0.025,15s,平均摩擦系数为0.4266,磨损失重为11.5 mg.可以看出渗银处理(×3 h)+渗氮碳处理(×10 h)工艺未提升渗银不锈钢的表面硬度,渗氮碳处理(×10h)+渗银处理(×3 h)工艺将渗银不锈钢的表面硬度提升了近1倍.两种硬化工艺对渗银不锈钢的耐磨性能略有改善.
关键词:
抗菌不锈钢
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复合工艺
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显微硬度
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耐磨性
