SiC晶须增韧补强AIN材料的研究

研究了ＡＩＮ陶瓷及ＳｉＣｗ－ＡＩＮ复合材料的机械性能和显微结构．在ＡＩＮ中加入２０％ＳｉＣ晶须后，其弯曲强度增加了７７％，断裂韧性增加了６４％．用ＳＥＭ和ＴＥＭ分析材料的显微结构表明，复合材料的增韧机制是晶须拔出，裂纹偏转的综合作用，而增强的原因在于ＳｉＣｗ－ＡＩＮ界面结合适宜，使荷载有效地从基体转移到晶须．     

干摩擦条件下Al_2O_（3f）／ZL109复合材料的磨损行为

用压铸法制备Ａｌ２Ｏ（３ｆ）／ＺＬ１０９复合材料，研究了恢复合材料在干摩擦条件下磨损量与滑动距离的关系，结果表明：复合材料磨损失效的临界值远高于其基体合金．同一时刻对应的耐磨性也明显高于基体合金。借助ＳＥＭ及ＥＰＭＡ等手段对磨损表面及亚表面和粘着磨损的材料转移情况进行了观察和分析，并对磨损机制进行了讨论。     

热致液晶聚合物与聚醚砜原位复合材料再加工性能的研究

本文研究了热致液晶聚合物ＴＬＣＰＫＵ９２３１和聚醚砜（ＰＥＳ）原位复合材料的再加工性能，在ＰＥＳ中加入２５ωｔ％的ＴＬＣＰＫＵ９２３１，拉伸强度大幅度提高，再次加工时拉伸强度虽略有下降，但仍远远高于ＰＥＳ的拉伸强度．随着循环加工次数增加，拉伸强度明显下降．     

硅烷偶联剂改性PPy/SiO_2纳米导电复合材料的研究

首先用硅烷偶联剂ＡＰＳ处理 ＳｉＯ２,然后用化学聚合方法合成聚吡咯／二氧化硅（ＰＰｙ／ ＳｉＯ２）纳米复合材料．文中分析了硅烷偶联剂的结构特征和作用机理,复合材料电性能研 究结果表明 ＡＰＳ的加入使得复合材料的 ＰＰｙ含量增加,电导率及材料稳定性提高．其中 ＰＰｙ／１％ＡＰＳ—ＳｉＯ２复合材料电导率最高,为 ３８．４６ Ｓ／ｃｍ,达到文献报导最高值．     

Al_2O_3／Al－Si合金复合材料中硅相形貌观察

利用挤压铸造制备Ａｌ２Ｏ３／Ａｌ－Ｓｉ合金复合材料，在扫描电子显微镜（ＳＥＭ）上观察了复合材料中的硅相形貌．结果表明Ａｌ２Ｏ３纤维与Ｓｉ相之间存在共格界面，可作为硅相非自发形核的衬底；复合材料中的初生硅可在纤维表面形核生长为颗粒状；复合材料中的纤维在Ａｌ－Ｓｉ共晶体的共生生长过程中，可触发孪晶，导致纤维附近的共晶硅里变质形态．     

聚氧乙烯-蒙脱石夹层复合材料的合成研究

用ＸＲＤ、ＩＲ、ＤＳＣ和ＳＥＭ等分析方法研究了聚合物粉末直接熔融嵌入合成聚氧乙烯（ＰＥＯ）－蒙脱石夹层复合材料的过程。结果表明：９０℃ＰＥＯ熔融能够嵌入蒙脱石层间,其嵌入量随热处理时间增加。热处理１０ｈ的样品,ＰＥＯ已完全嵌入层间,蒙脱石的ｄ００１值由层间含吸附水的１５．５４增加到层间含ＰＥＯ的１７．９９;同时在ＤＳＣ测量范围内层间ＰＥＯ熔融吸热峰的消失。     

中空玻璃微珠填充环氧树脂复合材料

讨论了用发电厂固体废料中的中空玻璃微珠填充Ｅ－４４环氧树脂制备轻质复合材料，实验详尽地考察了微珠填料，ＫＨ－５００偶联剂，固化剂（三乙基四胺，Ｔ－３１，三乙醇及液体四氢苯酐）及低聚酰胺等增韧剂等对所得的复合材料为力学性能的影响，并通过扫描电镜（ＳＥＭ）观察了材料的形态，其结果表明，偶联剂和增韧剂对复合材料的力学性能影响较大，中空玻璃微珠填充环氧树脂赋予基轻质，高强，价廉等特性。     

聚氧乙烯—蒙脱石夹层复合材料的合成研究

用ＸＲＤ、ＩＲ、ＤＳＣ、和ＳＥＭ等分析方法研究了聚合物粉末直接熔融嵌入合成聚氧乙烯（ＰＥＯ）－蒙脱石夹层复合材料的过程。结果表明：９０℃ＰＥＯ熔融能够嵌入蒙脱石层间,其嵌入量随热处理时间增加,热处理１０ｈ的样品,ＰＥＯ已完全嵌入层间,蒙脱石的ｄ００１值由层间含吸附水泊１５．５４Ａ增加到层间含ＰＥＯ的１７．９９Ａ,同时在ＤＳＣ测量范围内层间ＰＥＯ熔融吸热峰的消失。     

高温氧化对AlN/TiC/TZP材料的组织结构与性能的影响

研究了 Ａｌ Ｎ／ Ｔｉ Ｃ／ Ｔ Ｚ Ｐ复合材料的高温氧化及其对组织与性能的影响．高温氧化实验表明,在１４００ ℃范围内,随氧化温度和时间增加,氧化增重符合抛物线规律,同时复合材料的强度和韧性急剧下降．用 Ｘ Ｒ Ｄ、 Ｓ Ｅ Ｍ 和 Ｔ Ｅ Ｍ 观察分析了氧化前后试样的显微组织结构．探讨了复合材料的高温氧化机理．     

（Y—ZrO_2）－Al_2O_3陶瓷（AZ）的摩擦磨损

通过ＳＥＭ、ＴＥＭ和ＸＲＤ等手段对以Ｙ２Ｏ３为稳定剂ＺｒＯ２增韧的Ａｌ２Ｏ３陶瓷复合材料的显微结构、力学性能及与钢对摩时的摩擦磨损行为进行了系统分析，并对其微观机理做了初步探讨．结果表明，转移层的出现对对摩材料起到了保护作用；ＺｒＯ２的加入提高了材料的耐磨性能，但摩擦高温会导致ＺｒＯ２ｔ→ｍ相交增韧作用失效．     

Sintering products molded by injecting ceramic and metal powders

The injection molding products with different volume ratios of ZrO2 ceramic powder to 316L stainless steel powder were prepared. Properties and structure of the products were characterized by X-ray diffraction(XRD), scanning electron microscope(SEM) and transmission electron microscope (TEM). The results show that the compressive stress exists in the products and the bend strength reaches 300 MPa. ZrO2 phase and stainless steel phase are uniform in samples. The toughness of ceramic increases with the increasing the content of stainless steel. Through TEM study of the interface, some crystalline orientation relationships are determined.     

Microstructure and mechanical properties of WC-20wt% Co/ZrO2（3Y）cermet composites

The cermet composites WC-20wt%Co/ZrO2（E6）with four different comtents of ZrO2（3Y）were prepared by normal vacuum sinter processing;the optical microscope and SEMwere used to characterize their microstructures.The hardness.bending strength and impact toughness of the specimens were determined.The experimental results show that ZrO2（3Y） particles in WC-20wt%Co matrix are sphcrical particles in different sizes which are distributed uniformly in Co phases and WC phases,the bending strength and impact toughness of the WC-20wt%Co cermet composites added ZrO2（3Y）improve remarkably.but the hardness values have little change.     

Mechanical Properties and Erosive Wear Resistance of Zirconia Toughened Al2O3-TiC Ceramics

The effect of ZrO2, content on the fracture toughness, flexural strength and Vickers hardness as well as the erosive wear resistan properties of zirconia toughened Al2O3-TiC ceramic composites has been investigated. The results showed that the improvement in fracture toughness and flexure strength of composites with the content of zirconia less than 50% and 10% in mass fraction respectively,is primarily attributed to stress-induced transformation toughening by the analyse of X-ray diffraction. The dependance of erosion wear resistance on the attak angle and the content of ZrO2, panicles of the composites was also revealed. It is found that the erosion rate of the composites has a sharp rise at a attack angle over 65°. This phenomenon is due to a brittle response to the erosion test by microsmictural observation on eroded surface.     

Physico-chemical properties and microstructure of hydroxyapatite-316L stainless steel biomaterials

Sintering shrinkage, compressive strength, bending strength, metallurgical morphology, microstructure and chemical composition diffusion of hydroxyapatite-316L stainless steel(HA-316L SS) composites were investiga-ted. The results show that the sintering shrinkage of HA-316L SS composites decreases from 27.38O/6o to 8.87% for cylinder sample or from 27.18% to 8.62% for cuboid sample with decreasing the volume ratio of HA to 316L SS,which leads to higher sintering activity of HA compared with that of 316L SS. The compressive strength of HA-316L SS composites changes just like parabolic curve (245.3→126.3→202.8 MPa) with reducing the volume ratio of HA to 316L SS. Bending strength increases from 86.3MPa to 124. 2 MPa with increasing the content of 316L SS. Furthermore, comprehensive mechanical properties of 1.0：3.0 (volume ratio of HA to 316L SS) composite are optimal with compressive strength and bending strength equal to 202. 8 MPa and 124. 2 MPa, respectively. The microstructure and metallurgical structure vary regularly with the volume ratio of HA to 316L SS. Some chemical reaction takes place at the interface of the composites during sintering.     

Al/Pb-WC-ZrO2-Ag和Al/Pb-WC-ZrO2-CeO2 复合电极材料的性能研究

研究了Ag固体微粒对Al／Pb WC ZrO2 Ag复合电极材料电化学性能的影响、结果表明，银粉的质量浓度为3～4g／L时制得的Al／Pb WC ZrO2 Ag复合电极材料综合性能较好．研究Ce02固体微粒对Al／Pb WC ZrO2 CeO2复合电极材料电化学性能的影响，结果表明，当Ce02的质量浓度为10～20g／L时制得的A1／PbWCZr02Ce02复合电极材料相对较好．     

加压下介孔分子筛Mo-MCM-41负载SO_4~(2-)/ZrO_2催化合成松香甲酯

采用浸渍的方法制备了SO42-/ZrO2/Mo-MCM-41,通过XRD、FI-IR及Py-IR对合成的材料进行了表征。结果表明,负载后的介孔分子筛与Mo-MCM-41相比,仍具有介孔结构且具有良好的长程有序性,具有大量的B酸和L酸中心。将合成的材料用于催化合成松香甲酯,结果表明,SO42-/ZrO2/Mo-MCM-41具有较好的催化活性,较适宜的反应条件为n(松香)∶n(甲醇)=1∶4,反应温度220℃,反应时间3 h,催化剂用量0.2 g(占松香质量4%)。     

氧化锆球体上的铝膜机械球磨法制备及工艺研究

在氧化锆球体上用机械球磨法制备铝膜,采用SEM和EDS观察铝膜的显微形貌及成分,分析了铝涂层的形成过程,运用L9（3^4）正交试验研究了球磨时间、球磨转速和球料比等工艺参数对膜厚的影响规律。结果表明：球磨转速、球磨时间、球料比影响膜厚的极差依次减小;以球磨时间10h、转速250r／min、球料比7：1参数制备的铝膜最厚,达到了50μm,且铝膜结构较致密,含氧量低、纯度高,与氧化锆球体机械结合良好。     

150 MPa超高强水泥基材料的研究

采用常规原材料和工业废渣，普通成型工艺，通过正交设计试验研究，配制出了抗压强度为150MPa的超高强水泥基材料，并给出了优选配比。超高强水泥基材料强度试验的极差和方差分析表明：水胶比为影响超高强水泥基材料强度的最显著因素，硅灰和不锈钢纤维渣的掺量以及胶砂比也有十分显著的影响。     

Stainless steel binder for the development of novel TiC-reinforced steel cermets

Steel reinforced TiC composites are an attractive choice for wear resistance and corrosion resistance applications. TiC- reinforced 17-4PH maraging stainless matrix composites were processed by conventional powder metallurgy （P/M）. TiC-reinforced maraging stainless steel composites with 〉97% of theoretical density were fabricated. The microstructure, mechanical and wear properties of the composites were evaluated. The microstructure of these composites consisted of spherical and semi-spherical TiC particles. A few microcracks appeared in the composites, showing the presence of tensile stress in the composites produced during sintering. Typical properties, namely, hardness and bend strength were reported for the sintered composites. After heat treatment and aging, the increase of hardness was observed. The increase of hardness was attributed to the aging reaction in the 17-4PH stainless steel. The precipitates appeared in the microstructure and were responsible for the increase in hardness. The specific wear behavior of the composites was strongly dependent on the content of TiC particles, the interparticle spacing, and the presence of hard precipitates in the binder phase.     

Corrosion resistance of plasma sprayed NiCrAl (ZrO_2 Y_2O_3) thermal barrier coating on 18-8 steel surface

1INTRODUCTION Austeniticstainlesssteelisdevelopedtocom pensateforpoorcorrosionresistanceofmartensite stainlesssteelandoverlargebrittlenessofferrite stainlesssteel.Basicconstituentsofitstypicalal loyare18%Crand8%Ni(massfraction),which isusuallycalledas188s…