EFFECT OF COPPER IMPLANTATION ON ANTIBACTERIAL ACTIVITY OF AUSTENITIC STAINLESS STEEL

1.IntroductionThe consciousness of hygiene safety and cleanliness has been rapidly raised because of the inci-dents caused by injurious germs' spread. In response to such circumstances, many antibacterial pro-ducts such as sanitation fixture, plastic products and articles of clothing have been developed in various fields[1]. So the subjects of study on stainless steel with antibacterial activity have been paid to more and more attention[2,3]. Ion implantation is a promising technique permittin…     

EFFECT OF CARBON CONTENT IN SUBSTRATE ON CVD TiN COATING

Effect of carbon content of steel substrate,on the chemical vapour deposition(CVD)ofTiN has been investigated.The increment of deposition rate is linearly related to the increaseof carbon content in own substrate.The α-Fe peak,besides TiN,is revealed in X-raydiffraction pattern of TiN coating.The(220)preferred growth of TiN deposited on steelCr12MoV substrate increases with the increase of depositing temperature.Only Ti energyspectrum was found from the bright region at coating surface and the interior,while bothTi and Fe energy spectra from dark region.     

DIMPLE FORMATION ON FRACTURE SURFACE OF STEEL 55SiMnMo

The fracture surface of the normalized steel 55SiMnMo was observed,under tensile device at-tached on the SEM,to be of ductile dimple feature on the bainite which is composed of lathferrite and austenite platelet.The dimple is essentially nucleated in the ferrite.Because theaustenitic plastic deformation is remarkable during fracturing,the tear ridge of dimple is verysharp.     

INFLUENCE OF SURFACE MODIFICATION OF Ti BY FLUORINE ION-IMPLANTATION ON FORMATION AND EXPRESSION OF COLLAGEN-I ON OSTEOBLAST

应用等离子体浸没离子注入装置对纯Ti表面进行氟离子注入, 通过SEM和XPS分析研究材料的表面形貌和化学组成. 将MG-63成骨细胞接种于氟离子注入前、后的 Ti样品表面, 采用激光共聚焦显微镜观察材料表面对成骨样细胞MG-63 I型胶原形成的影响; 逆转录聚合酶链反应检测I型胶原mRNA的表达; 蛋白印迹法检测I型胶原蛋白的表达. 结果表明, 氟离子注入后Ti样品表面新出现TiF3; 且MG-63细胞在其表面分别培养6, 24和48 h后, I型胶原的形成和表达均明显高于纯Ti表面. 含氟表面改性层可提高Ti材料的生物相容性.     

TENSILE AND ADHESIVE STRENGTHS OF FINE TiN FILM ON Ti SUBSTRATE

The cantilever bending test,particularly monitored by an acoustic emission technique,was adopted to measure the tensile and interfacial adhesive strengths of the HCD ionplated fine TiN film on pure Ti substrate.The behaviors of film damaging were foundto be characterized by:an internal tensile stress which exceeded its tensile strength forTiN facing upward,and a shearing stress along film substrate interface which exceededits adhesive strength for TiN facing downward.The measured tensile and adhcsivestrengths are 603 and 242 MPa respectively.     

EFFECT OF MICROSTRUCTURE ON FATIGUE CRACK INITIATION OF SHOT PEENED COPPER AND BRASS

ＥＦＦＥＣＴＯＦＭＩＣＲＯＳＴＲＵＣＴＵＲＥＯＮＦＡＴＩＧＵＥＣＲＡＣＫＩＮＩＴＩＡＴＩＯＮＯＦＳＨＯＴＰＥＥＮＥＤＣＯＰＰＥＲＡＮＤＢＲＡＳＳＫ．Ｗ．Ｘｕ;Ｎ．Ｓ．ＨｕａｎｄＪ．Ｗ．Ｈｅ（Ｓｔａｔｅ－ＫｅｙＬａｂｏｒａｔｏｒｙｆｏｒＭｅｃｈａｎｉｃ...     

TEMPERATURE DEPENDENCE UPON VISCOSITY OF Ni-P ALLOY ON AMORPHOUS FORMATION

The viscous flow of amorphous alloys near T_gis closely related to the viscosity of liquid alloys.On the basis of the measured surface tension and density for Ni-P binary alloys,the correla-tion between the viscosity of the melt and viscous flow process of the amorphous alloy is inves-tigated.The relationship between viscosity and temperature for Ni-P alloys going from liquidto amorphous solid may be described by the following formula:     

EFFECTS OF THERMAL CYCLE ON MECHANICAL PROPERTIES OF SiC PARTICLES REINFORCED MoSi_2 COMPOSITE

ＥＦＦＥＣＴＳＯＦＴＨＥＲＭＡＬＣＹＣＬＥＯＮＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＯＦＳｉＣＰＡＲＴＩＣＬＥＳＲＥＩＮＦＯＲＣＥＤＭｏＳｉ_２ＣＯＭＰＯＳＩＴＥ￥ＺＨＥＮＧＬｉｎｇｙｉ;ＪＩＮＹａｎｐｉｎｇ;ＬＩＰｅｎｇｘｉｎｇ（ＴｈｅＳｔａｔｅ?..     

FORMATION OF μ-PHASE AND ITS EFFECT ON MECHANICAL PROPERTIES OF CAST NICKEL-BASE SUPERALLOYS

本文研究了铸造镍基高温合金中沉淀的片状μ相,揭示了μ相的形成规律、化学成份、TTT曲线、断裂特征和对力学性能的影响。研究结果表明,μ相的形成温度范围很宽,从800—1140℃。片状μ相的宽面是六方指数的{0001},它沿基体γ的{111}面板出。在760℃以下冲击,拉伸和持久的断裂特征是沿μ相{0001},面解理断裂,电子空位数N_v值不是控制μ相形成的唯一因素,还与(Mo+W)at.-％和Mo(Mo+W)有关。此外,硼也是抑制μ相的有效因素。     

EFFECT OF IRON ON FORMATION OF MECHANICALLY ALLOYED NiAl ALLOY AND ITS MECHANICAL PROPERTIES

ＥＦＦＥＣＴＯＦＩＲＯＮＯＮＦＯＲＭＡＴＩＯＮＯＦＭＥＣＨＡＮＩＣＡＬＬＹＡＬＬＯＹＥＤＮｉＡｌＡＬＬＯＹＡＮＤＩＴＳＭＥＣＨＡＮＩＣＡＬＰＲＯＰＥＲＴＩＥＳＪ．Ｔ．Ｇｕｏ;Ｌ．Ｚ．Ｚｈｏｕ;Ｚ．Ｇ．ＬｉｕａｎｄＷ．Ｍ．Ｙｉｎ（Ｉｎｓｔｉｔｎｔｅｏｆ...     

SIZE DISTRIBUTION AND BEHAVIOUR OF VC PARTICLES IN FERRITIC NODULAR CAST IRON

Size distribution and precipitation of VC particles in ferritic nodular cast iron havebeen examined by techniques of ultrasonic screening,small angle X-ray scattering andchemical dissolution.The VC particles are sized over a wide range.The superfine ones,dispersed in the ferritic matrix,are the majority.A saturated dispersion with ultrafineVC particles may be approached as the V content increasing in the iron.Thi5 seems toplay an important role in the precipitation strengthening for ferritic nodular cast iron.     

铁素体球铁中VC的粒度分布和作用

采用超声波筛分、X射线小角散射及化学溶解等方法,分析了铁素体球铁中VC的粒度分布和析出规律。结果表明:VC的粒子直径有很宽的分布范围,但超细VC占粒子总数的绝大部分;超细VC弥散分布于铁素体基体,随球铁含钒量增加,超细VC量趋于饱和,这部分碳化物在球铁的强化中起主要作用。     

涂覆Mannich碱对CU粉抗氧化性能的影响

在酸性溶液中对经一种Mannich碱处理的Cu粉进行了腐蚀实验.热分析结果表明,原始Cu粉在200℃开始氧化,而经处理的Cu粉从300℃开始氧化.X射线光电子能谱分析表明,该Mannich碱与Cu2 形成配位化合物吸附在Cu粉表面,形成Cu/缓蚀膜结构,通过覆盖效应抑制了腐蚀.设计实验分离出该Mannich碱与Cu粉的直接反应产物,并制备了Mannich碱与Cu2 的配合物配合物的红外光谱和紫外可见光谱表明,该Mannich碱是通过分子中的N原子与Cu2 形成配合物而实现保护作用,分子中的O原子未参与配位     

高浓度Bi3+离子对Cu电解精炼中阴极过程的影响

采用线性电位扫描法、循环伏安法、电导测定及XRD,XPS法等研究了高浓度Bi3+离子存在于酸性CuSO4电解液中对Cu电解精炼阴极过程的影响.研究表明Bi3+离子的存在减小了电解液的电导率,降低了阴极Cu沉积反应的交换电流密度、极限电流密度和峰电流密度,对Cu沉积反应起极化作用.在通常电流密度200 A·m-2下电解,Bi不会在阴极沉积,但促使Cu沉积的晶面220择优取向更加突出.在高电流密度1000 A·m-2下电解,Bi以Bi2O3形式存在于沉积层中,Cu沉积的晶面择优取向为111.     

LASER ALLOYING ON CHROMIUM COATED SURFACE OF NODULAR CAST IRON

１ＩＮＴＲＯＤＵＣＴＩＯＮＬａｓｅｒａｌｏｙｉｎｇｔｒｅａｔｍｅｎｔｍａｋｅｓｌａｓｅｒｂｅａｍｈｅａｔ,ａｎｄｍｅｌｔｏｒｓｏｌｉｄｉｆｙｍｅｔａｌｓｕｒｆａｃｅｑｕｉｃｋｌｙｂｙｈｅａｔｉｎｇｃｏｎｄｕｃｔｉｏｎｉｎｉｔｓｏｗｎｂｏｄｙ．Ｄｕｅｔ...     

电子束辐照下铜超微粒子氧化与还原过程的高分辨电子显微镜观察

利用电子显微镜中的电子束对铜超微粒子进行了连续地照射和跟踪观察,结果表明电子束使Cu与镜筒中的低氧压气氛发生了反应,电子束的辐照使纳米量级的Cu粒子发生了氧化并被消耗,首先生成一种类非晶膜,然后生成Cu的晶态氧化物,新生成的Cu的晶态氧化物,在电子束的进一步照射下,又发生了还原反应,不断地还原为铜     

电子束辐照下铜超微粒子氧化与还原过程的高分辨电子显微镜观察

利用电子显微镜中的电子束对铜超微粒子进行了连续地照射和跟踪观察，结果表明电子束使Ｃｕ与镜筒中的低氧压气氛发生了反应，电子束的辐照使纳米量级的Ｃｕ粒子发生了氧化并被消耗，首先生成一种类非晶膜，然后生成Ｃｕ的晶态氧化物，新生成的Ｃｕ的晶态氧化物，在电子束的进一步照射下，又发生了还原反应，不断地还原为铜     

氮化铝基板与Cu和Al的接合及其表面改质效果

对ＡｌＮ陶瓷基板进行了减压直流等离子体喷涂镀Ａｌ,在基板表面形成厚度约２μｍ的金属Ａｌ薄层,实现了Ａｌ与ＡｌＮ中的良好接合。     

Alloying Effect Of Ni And Cr On The Ttability Of Copper On W Substrate

By the sessile drop technique, the wettability of Cu/W systems with the additions of Ni and Cr has been studied under vacuum atmosphere. Effects of Ni and Cr contents and wetting temperatures on the wettability and the wetting mechanisms of copper on W substrate have been investigated in detail. The results show that the wetting angles of Cu on the W substrate are decreased with an increase in the content of Ni or Cr, and also decrease with raising the wetting temperatures. SEM, EPMA, and X-ray diffraction have been used to analyze the interracial characteristics of the CuNi/W and CuCr/W systems. The results reveal that there is a transition layer about 2- 3μm in the interface of Cu-4.0 wt pct Ni/W, in which the interrnetallic phase Ni4W is precipitated. As to CuCr/W system, no reaction occurs at the interface. The two factors are that the contents of Cr and Ni and the infiltration temperature must be chosen appropriately in order to control the interfacial dissolution and reaction when the Cu- W alloys are prepared by the infiltration method.     

铜表面气体渗硅涂层的抗氧化性能研究

对用硅烷-氢(SiH4/H2)混合气体在Cu表面进行化学热处理获得的含硅涂层进行了抗氧化性研究.结果表明,纯铜表面含硅涂层的形成提高了材料的抗氧化性能.对含硅铜涂层的氧化机理进行了探讨.