SiCp／ZA27复合材料的力学性能及耐磨性研究

采用搅拌法制备了不同 Ｓｉ Ｃｐ 含量的 Ｓｉ Ｃｐ／ Ｚ Ａ２７ 复合材料,对其抗拉强度、伸长率、硬度及耐磨量进行了测定。结果表明：与 Ｚ Ａ２７ 基体材料相比, Ｓｉ Ｃｐ／ Ｚ Ａ２７ 复合材料的抗拉强度、伸长率有所下降,硬度有所提高;而其耐磨性,尤其在重载条件下,明显高于基体材料。     

SiC_p/ZA27复合材料的摩擦磨损性能

探讨了不同含量、不同大小ＳｉＣｐ增强ＺＡ２７复合材料的摩擦磨损特性,并借助ＳＥＭ,ＥＤＡＸ对磨面及其剖面、磨屑进行了分析。结果表明：随着ＳｉＣｐ含量的增加,复合材料的磨损量急剧下降,摩擦系数也呈下降趋势,磨损机制将从粘着和剧烈切屑磨损转向微切削磨损;随着ＳｉＣｐ尺寸的增大,磨损量先急剧减小后趋于稳定,摩擦系数先减小后又升高,磨损机制将从粘着和剧烈切削转向微切削和因ＳｉＣｐ脱粘造成的磨料磨损;经ＸＲＤ分析复合材料的磨屑由Ｚｎ和Ａｌ的固溶体相及ＳｉＣｐ和对磨块４５＃钢的Ｆｅ相组成。     

SiCp／ZA27复合材料的制备及其力学性能

探讨了半固态机械搅拌法制备ＳｉＣｐ／ＺＡ２７复合材料的工艺，以及ＳｉＣｐ含量、大小对复合材料抗拉强度和硬度的影响，并对其抗拉断口进行了ＳＥＭ分析。结果表明：用该工艺可制得ＳｉＣｐ分布较均匀的锌基复合材料，其强度随ＳｉＣｐ含量、粒度的增大而减小；经ＳＥＭ分析，其断口呈部分韧性断裂，且断裂机制因ＳｉＣｐ含量、大小的不同而不同；当复合材料中Ｖ（ＳｉＣｐ）＜５％时，其硬度值随加入量的增加而升高，当Ｖ（ＳｉＣｐ）＞５％时，随含量增加而降低，且小颗粒ＳｉＣｐ增强复合材料的硬度比大颗粒的要高。     

SiCp／ZA27复合材料的摩擦磨损性能

探讨了不同含量、不同大小ＳｉＣｐ增加ＺＡ２７复合材料的摩擦磨损特性，并借助ＳＥＭ，ＥＤＡＸ对磨面及其剖面、磨屑进行了分析。     

颗粒增强ZA27基复合材料的摩擦磨损行为

用挤压浸渍法制备了ＳｉＣｐ／ＺＡ２７及Ａｌ２Ｏ３ｐ／ＺＡ２７复合材料,讨论了颗粒含量及种类对复合材料边界润滑条件下磨损性能的影响;对复合材料的摩擦磨损行为进行了研究。结果表明,随着颗粒含量的增加,复合材料的耐磨性增强,摩擦系数增大。复合材料的磨损以粘着磨损和磨粒磨损为主。     

SiCp颗粒复合对ZA27合金耐磨性能的影响

用铸造法制备了ＳｉＣｐ／ＺＡ２７复合材料,用ＭＭ２００磨损试验机,测定和对比了基体合金和不同颗粒含量复合材料在不同载重下的磨损量。结果表明：在重载条件下,复合材料的耐磨性远高于基体材料。     

喷雾沉积Ce变质高硅ZA27合金组织与性能

研究了０５％Ｃｅ变质前后喷雾沉积高硅ＺＡ２７合金的组织与力学性能。喷雾沉积高硅ＺＡ２７合金的组织由富Ｓｉ相、光滑无特征区、细层片状共析体、粗层片状共析体所组成；加０５％Ｃｅ变质后，组织结构大大细化，主要由富Ａｌ、Ｃｅ亮点状相、富Ｓｉ、Ｃｅ多角形相以及细层片状共析体组成；显微硬度测量结果表明，Ｃｅ变质提高了材料的塑性，从而有利于高硅ＺＡ２７合金的推广应用。     

二种锌铝合金和一种铝青铜在重载和润滑条件下摩擦磨损特性的研究

试验对比了锌铝合金ＨＤＺＡ、ＺＡ－Ｓｉ和铝青铜ＺＣｕＡｌ１０Ｆｅ３在重载及四种润滑剂润滑条件下的摩擦磨损特性。研究结果表明，ＨＤＺＡ合金和ＺＡ－Ｓｉ合金在润滑脂润滑条件下的摩擦磨损性能明显优于机油润滑；而ＺＣｕＡｌ１０Ｆｅ３合金在常用润滑脂润滑条件下的摩擦磨损性能远不及这二种锌铝合金。油润滑时，磨损机制是犁削、辗压和粘着；脂润滑时，磨损机制主要是辗压，基本上无粘着。油和脂的润滑特性，影响合金的摩擦磨损特性     

SiCp颗粒增强AZ80镁合金的摩擦磨损特性

本文研究了喷射搅拌铸造法制备的ＳｉＣｐ／ＡＺ８０复合材料的摩擦磨损性能。结果表明：复合材料的耐磨性优于基体合金；复合材料磨损表面存在由ＧＣｒ１５对磨环转移的富铁层，使复合材料－ＧＣｒ１５摩擦副的摩擦系数比ＡＺ８０－ＧＣｒ１５摩擦副低；复合材料的对磨环磨损量大于基体合金的对摩环磨损量，但复合材料摩擦副的总磨损量比基体合金摩擦副的小。     

SiCp/ZA22复合材料的组织与性能

采用半固态搅拌法＋热挤压成功地制备了ＳｉＣｐ／ＺＡ２２复合材料，对其组织、界面结构、力学性能等进行了研究。研究结果表明，复合材料中的ＳｉＣ颗粒分布均匀、组织致密、颗粒与基体界面结合良好，表现出高的力学性能。     

ZnAl27合金基复合材料高温蠕变性能研究

利用HBE-750型高低温硬度仪和H-800型TEM研究了SiC     

SiCp/ZA27复合材料的界面结构及耐磨性研究

通过扫描电镜和高分辩透射电镜观察，经选区电子衍射和微区化学成分分析，研究了SiCp／ZA27复合材料的界面结构及耐磨性。结果表明，SiC颗粒均匀地分布于ZA27合金中，界面结合良好，SiCp颗粒周边存在着大量的CuZn4化合物。CuZn4依附于SiC颗粒形核，沿SiC晶面长大速率大于垂直于SiC晶面的长大速率。SiC颗粒显著地提高了ZA27合金的耐磨性。当SiC颗粒含量达30％时，耐磨性提高了126．5倍。     

Friction and wear properties of casting in-situ silicon particle reinforced ZA27 composites

The effects of silicon particle content and testing temperature on friction and wear properties of casting in-situ silicon particle reinforced ZA27 composites were investigated. The wear mechanisms were mainly discussed by observations of both worn surfaces and their side views. The results indicated that the variations of wear resistance with increasing of silicon particle content, at all of the testing temperatures applied, showed a similar tendency with a manner of non-monotonous change. It was surpdsed that the wear resistance decreased with the increase of silicon particle content from 2 vol.% to 5 vol.%, while it increased when the content was less than 2 vol.% or more than 5 vol.%. Similarly, the friction coefficient also did not change monotonously. The dominative wear mechanism changed from a relatively severe regime of plastic deformation accompanied by adhesion wear to a mild regime of smear, then to a very severe regime of severe plastic deformation induced wear, and finally again to a relatively mild regime of smear accompanied by abrasive wear as the silicon content increased. The wear resistance always decreased with elevating testing temperature, but the decrease ranges were different for the composites with different silicon contents. The friction coefficients changed irregularly for the different composites with the increase of testing temperature. Correspondingly, the wear mechanism alternated from a mild regime of smear accompanied by abrasive wear to a severe regime of plastic deformation accompanied by adhesion wear.     

EFFECT OF MATRIX STRENGTHENING ON SLIDING WEAR PROPERTIES OF SiCp/2024Al COMPOSITES

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｃｅｒａｍｉｃｐａｒｔｉｃｕｌａｔｅｓｒｅｉｎｆｏｒｃｅｄａｌｕｍｉｎｕｍａｌｏｙｃｏｍｐｏｓｉｔｅｓｅｘｈｉｂｉｔｈｉｇｈｓｐｅｃｉｆｉｃｍｏｄｕｌｕｓａｎｄｓｔｒｅｎｇｔｈ，ａｌｓｏｇｅｔａｓｉｇｎｉｆｉｃａｎｔｉ...     

Aluminum-silicon carbide coatings by plasma spraying

An aluminum base composite (Al-SiC) powder has been developed for producing plasma sprayed coatings on Al and other metallic substrates. The composite powders were prepared by mechanical alloying of 6061 Al alloy with SiC particles. The concentration of SiC was varied between 20 and 75 vol%, and the size of the reinforcement was varied from 8 to 37 μm in the Al-50 vol% SiC composites. The 44 to 140 μm composite powders were sprayed using an axial feed plasma torch. Adhesion strength of the coatings to their substrates were found to decrease with increasing SiC content and with decreasing SiC particle sizes. The increase in the SiC content and decrease in particle size improved the erosive wear resistance of the coatings. The abrasive wear resistance was found to improve with the increase in SiC particle size and with the SiC content in the composite coatings.     

(SiC+B4C)p/AZ91D复合材料的组织及性能

采用微波烧结制备了(SiC+B4C)p/AZ91D复合材料,研究了不同体积分数(SiC+B4C)p(0%、5%、10%、15%、20 vol%)对复合材料组织及性能的影响。结果表明:(SiC+B4C)p/AZ91D复合材料的组织主要由α-Mg、SiC、B4C、Mg17Al12和少量MgO等组成。随着(SiC+B4C)p含量的增加,(SiC+B4C)p/AZ91D复合材料的相对密度减小,显微硬度增加,而抗压强度先增后降,当(SiC+B4C)p含量为15%时达到最大值。15%(SiC+B4C)p/AZ91D复合材料的显微硬度和抗压强度分别达到196.16 HV0.025和326.3 MPa,相对于未添加(SiC+B4C)p的AZ91D材料分别提高了145%和120%。随着(SiC+B4C)p含量的增加,复合材料的耐磨性先提高后降低,磨痕由清晰的犁沟形貌逐渐模糊,磨损机制由磨粒磨损转变为剥层磨损。     

Dry sliding friction and wear behaviors of TiCp／ZA—12 composites

1　ＩＮＴＲＯＤＵＣＴＩＯＮＳｉｎｃｅｚｉｎｃ ａｌｕｍｉｎｕｍａｌｌｏｙｓｈａｖｅｂｅｅｎｗｉｄｅｌｙｕｓｅｄｉｎｔｈｅｐｒｏｄｕｃｔｉｏｎｏｆｄｉｅａｎｄｂｅａｒｉｎｇｆｏｒｔｈｅｉｒｅｘ ｃｅｌｌｅｎｔｗｅａｒｒｅｓｉｓｔａｎｃｅｐｒｏｐｅｒｔｙ ,ｔｈ     

Abrasive Wear of In Situ AlB2/Al-4Cu Composite Material Produced by Squeeze Casting Method

The wear behavior of a weight fraction of particles with up to 30 wt.% in situ AlB₂ flakes reinforced in Al-4Cu matrix alloy composites and fabricated by a squeeze casting method was investigated in a pin-on-disk abrasion test instrument against different SiC abrasives at room conditions. Wear tests were performed under the load of 10 N against SiC abrasive papers of 80, 100, and 120 mesh grits. The effects of sliding speed, AlB₂ flake content, and abrasive grit sizes on the abrasive wear properties of the matrix alloy and composites have been evaluated. The main wear mechanisms were identified using an optical microscope. The results showed that in situ AlB₂ flake reinforcement improved the abrasion resistance against all the abrasives used, and the abrasive wear resistance decreased with an increase in the sliding speed and the abrasive grit size. The wear resistances of the composites were considerably bigger than those of the matrix alloy and increased with increases in in situ AlB₂ flake contents.