基体

The results show that the brush-plating coating is even and compact from section plane with good toughness and adhesion. The microhardness of the coating is 230.6HV0.5 which is 3 times of cast aluminium substrate. The wear resistance of the coating is 3 times of cast aluminium substrate. But the friction coefficient of the coating is 0.70 which is more high than that of the substrate, which is favorable for the fixed conjugate between the axis sheath and the axis seat of the gear-box.

结果表明，镀层厚度分布均匀、致密，镀层与基体界面清晰，未出现氧化物夹层，镀层的韧性和结合强度均较好；测得碱性铜及铸铝基体的显微硬度分别为230.6、74.2HV0.5；碱性铜的镀制使基体表面显微硬度及耐磨性均提高了2倍多，磨损状况明显改善。

As polypropylene fiber has virtues of good mechanics properties and enduring chemic corrasion , which can be used improve resisted tensile stress and toughness .

聚丙烯纤维是一种弹性模量低于水泥基基体的有机合成纤维，由于聚丙烯纤维具有很好的力学性能，耐化学侵蚀的优点，它可望用于改善基体的抗拉性能与韧性性能。

Using carbon, iron, silicon, ferrochromium, ferrotitanium and nickel powder as the raw materials, chromium carbide/Fe-based composite coatings with an even and smooth surface were prepared by vacuum reactive braze coating, which combined with a mild steel substrate by a metallurgical bonding.

以纯铁粉、硅粉、硼铁粉、铬铁粉、胶体石墨及镍粉为原料，通过真空反应钎涂在低碳钢基体上制备了碳化铬／铁基自熔合金复合涂层，涂层表面光滑、平整且与基体为冶金结合。

Using carbon, iron, silicon, ferrochromium, ferrotitanium and nickel powder as the raw ma terials, chromium carbide/Fe-based composite coatings with an even and smooth surface were prepared by vacuum reactive braze coating, which combined with a mild steel substrate by a metallurgical bonding.

以纯铁粉、硅粉、硼铁粉、铬铁粉、胶体石墨及镍粉为原料，通过真空反应钎涂在低碳钢基体上制备了碳化铬／铁基自熔合金复合涂层，涂层表面光滑、平整且与基体为冶金结合。应用扫描电子显微镜、能谱仪、X射线衍射仪及显微硬度计，研究了涂层的组织结构、成分分布和硬度分布。

The improvement of the frictional resistance is mainly due to the effect of carbon on residual austenite and the morphology of carbides, and an appropriate amount of residual austenite is helpful to improve the impact toughness and hardness of matrix; The spherical VC can hinder the initiation and propagation of crack and improve the frictional resistance.

碳含量对耐磨性的影响主要是通过对基体残余奥氏体量和碳化物形态表现出来的，适量的残余奥氏体使基体具有较好的冲击韧度及硬度；形态较为固整的VC颗粒，对裂纹的萌生及扩展起阻碍作用，从而使材料的耐磨性提高。

Many AlNi intermetallic compounds were found in the stainless steel layer of high Al content.

同时由于AlNi相的存在，基体中固溶的Ni含量减少，使基体具有铁素体组织。

In the raw metal powders were continually solid-soluble into Ni matrix and the lattice parameter of Ni-base solid-solution was increased with processing time.

在球磨过程中，原料中的Cr-Ni基母合金以及W，Mo，Ta等元素不断向Ni基体中周溶，使Ni基固溶体γ_的点阵参数逐渐增大。

Microstructural observation revealed that a lot of epitaxial growth fibrous AlN polytype occurred in matrix. Y_2O_3 seems to act as a densifier for in-situ formation material and as medium for growth of fibrous polytype. SiO_2 is the growth promoter for fibrous polytype. The occurrence of fibrous polytype may increase the strength and toughness of AlN ceramic composite material.

实验结果表明，AlN-Y_2O_2-SiO_2系陶瓷复合材料的抗弯强度和断裂韧性较AlN陶瓷均有大幅度的提高，微观结构观察发现基体中存在大量共生的纤维状AlN多型体(27R，21R)，系统中Y_2O_3不仅是原位生长复合AlN材料的致密剂，而且是纤维状多型体生长的媒介，SiO_2，是纤维状多型体生长的助生长剂，基体内纤维状多形体的存在提高了AlN陶瓷的强度和韧性。

The effect of resin matrix's structure and property on the composite was studied based on the analysis.

设计了一系列针对碳纤维湿法缠绕的环氧树脂基体，测试了树脂浇注体及其复合材料的力学性能和热机械性能，研究了树脂基体对碳纤维复合材料界面性能的影响。

The locomotory apparatus that emerges during the spermiogenesis consists of the multilayered structure, basal bodies, flagella and accessory structures.

精子发生过程中形成的运动器的各部分结构包括鞭毛、基体、多层结构及附属结构；基体是细胞中新形成的结构，在不同类群的蕨类植物中分别由双中心粒、分支生毛体和生毛体产生。

What are your goals and strategies for growth?

你的成长目标和策略是什么？

And unto the angel of the church in Sardis write; These things saith he that hath the seven irits of God, and the seven star I know thy works, that thou hast a name that thou livest, and art dead.

3：1 你要写信给撒狄教会的使者，说，那有神的七灵和七星的，说，我知道你的行为，按名你是活的，其实是死的。