1) powder metallurgical step bearing material
粉末冶金锭底材料
1.
Under simulating ingot bladestep bearing pieces and working conditions,the friction-wear properties of several new powder metallurgical step bearing materials were tested with the orthogonal method.
结果发现,Fe-C-Cu粉末冶金锭底材料的含Cu量和含油率分别为3。
2) metallurgical powder material
粉末冶金材料
1.
Metallurgical powder materials mainly include hard alloy, low friction metallurgical powder material, metallurgical powder structure material and friction metallurgical powder material etc.
粉末冶金材料主要包括硬质合金、粉末冶金减摩材料、粉末冶金结构材料和粉末冶金摩擦材料等。
3) Powder Metallurgy-Materials
粉末冶金-材料
4) powder metallurgy material
粉末冶金材料
1.
Applications of manganese in powder metallurgy materials;
锰在粉末冶金材料中的应用
2.
The yield criterion for powder metallurgy materials is a basis of generalized plasticity theory for these materials,and its mathematical expression has important effect on the estallishment of generalized plasticity theory.
粉末冶金材料屈服条件是粉末冶金材料广义塑性理论的基础 ,其数学表达式对粉末冶金材料广义塑性理论方法的建立有重要影响。
3.
Aimed at the problems of abrasion and oil-leakage of the diesel engine valve guide bush,a new powder metallurgy material of high strength and abrasion resistance performance was developed Three different sealing structures were designed,and theoretical analysis of the characteristic of hydrodynamic lubrication for these structures was carried out.
针对柴油机气门导管的漏油与磨损问题 ,设计了高性能粉末冶金材料和三种不同的密封结构 ,并从理论上对这些结构的流体动力润滑特性进行了分析计算 ;然后通过对材料改进前后的摩擦磨损试验、不同结构的漏油量对比试验和整机排放试验 ,证实材料设计和理论计算是合理的 ,同时也证实气门导管只加工凹槽而不安装密封圈的结构既可以润滑又可以密封 ,此结构不仅节省密封圈、简化装配工艺 ,而且减少进入进、排气道的机油量 ,降低颗粒排放 ,还减轻了气门副的磨损 ,从而在实际机型中得到应
5) Powder metallurgical material
粉末冶金材料
1.
The yield criterion for powder metallurgical materials was a key basis of genera lized plasticity theory.
粉末冶金材料屈服条件是广义塑性理论的重要基础。
2.
Plastic forming is an important process for powder metallurgical materials, but the classic plasticity theory based on the volume constancy for fully dense materials can′t be applied to the powder metallurgical materials.
塑性加工是粉末冶金材料的重要加工工艺 ,致密熔铸材料经典塑性理论 ,不适于塑性体积变化的粉末冶金材料。
3.
Based on the yield criterion and plastic potential theories, a plastic constitutional relation, yield condition and yield curve equation in plane strain for powder metallurgical material were derived.
粉末冶金材料是塑性可压缩材料 ,其塑性理论方法有待于深入研究。
补充资料：机械工程材料:粉末冶金多孔材料
用粉末冶金的方法製造的﹑内部结构为多孔的材料(或製品)﹐一般由球状或不规则形状的金属或合金粉末经成形和烧结製成﹐又称烧结多孔材料。这种材料为孔道纵横交错﹑互相贯通的多孔体﹐通常具有30～60％体积的孔隙度﹐孔径1～100微米。常用的金属或合金有青铜﹑不锈钢﹑铁﹑镍﹑鈦﹑钨﹑鉬以及难熔金属化合物等。做成的製品有坩堝状﹑碟状﹑管状﹑板状﹑薄膜等。粉末冶金多孔材料的特点是﹕孔径和孔隙度均可控制﹔优良的透过性能﹐且在使用后可以再生﹐因而使用寿命长﹔导热﹑导电﹔耐高温﹑耐低温﹑抗热震﹔抗介质腐蚀﹔比表面积大﹔可焊接和加工等。因此它的综合性能较传统的纸质﹑棉和化纤织品﹑陶瓷﹑玻璃﹑金属丝网等过滤材料为好。在现代技术中﹐多孔材料愈益发挥其重要作用﹐有两方面的主要用途。作过滤器用﹕利用其多孔的过滤分离作用净化液体和气体。例如用来净化飞机和汽车上的燃料油和空气﹔化学工业上各种液体和气体的过滤﹔原子能工业上排出气体中放射性微粒的过滤等。利用其孔隙的作用﹐製造多孔电极﹑灭火装置﹑防冻装置﹑耐高温喷嘴等。多孔电极主要在电化学方面应用。灭火装置是利用其抗流作用而防止爆炸﹐如气焊用的火焰防爆器等。防冻装置是利用其多孔可通入预热空气或特殊液体﹐用来防止机翼和尾翼结冰。耐高温喷嘴则是利用表面发汗而使热表面冷却的原理﹐被称为发汗材料。(见彩图 粉末冶金多孔材料 )
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条