化合法制备氟铝酸钾钎剂的研究

采用化合法制备了氟铝酸钾钎剂,对所制备的钎剂进行了DSC-TG分析,并进行了XRD测试,与熔炼法、机械研磨法、烧结法和水调法所制备的同类钎剂进行了对比.结果表明,化合法制备的钎剂熔点最低、钎焊性最好.     

铝用氟化物钎剂的配制方式及对钎焊性能的影响

就铝用氟化物钎剂的不同配制方法进行了对比，测定了各种方法配制的钎剂组成，分析了配制机理，并对制取的钎剂进行了钎焊性能的测定。测定结果表明，四种钎剂的钎焊性能无多在差别，认为水调不，水煮法制取钎剂方法简单，更适于生产。     

锌铝合金软钎剂的研究及分析

研制了多种有机和无机软钎剂,对各钎剂进行了对比实验,确定了适合锌铝合金钎焊的无机软钎剂.对该钎剂进行了不挥发物含量、腐蚀率试验.结果表明:ZnCl2-NH4Cl-KF钎剂可以有效去除锌铝合金表面氧化膜和钎焊过程中形成的氧化物;促进钎料的润湿;钎剂残渣的腐蚀性小,残余少且清除容易.     

灰铸铁稀土系复合孕育剂的研究

本文对多元(RE,Al,Ca,Cu,Cr,Mn,Si)复合孕育剂进行了正交试验,优选了两种高强度灰铸铁孕育剂。对试验数据进行了回归分析,得出了一个具有一定显著性的铸铁强度与复合孕育剂各组元含量之间关系的回归方程。对优选出的两种复合孕育剂进行了重复试验,与传统孕育剂75FeSi 进行了比较,并在生产中验证了实验室的试验结果。     

石材切割锯片结合剂中铁含量对金刚石把持力的影响

本文对石材切割锯片刀头结合剂中铁含量对金刚石的把持力进行了试验研究。在刀头结合剂中以适量的铁来取代钴，并采用适合的铁镍比例，可以获得与高钴结合剂相当的基体强度和优于高钴结合剂的把持力。同时，对结合剂中铁含量对金刚石把持力的影响原因进行了分析。     

银钎剂的改性处理

依据银钎剂QJ102的原料配比，通过改进配制工艺，对银钎剂进行了改性处理研究。分析了改性机理，并对改性所得的钎剂进行了钎焊性能测试。测试结果表明，改性后的银钎剂已达到国家外同类产品的水平。在各种改性处理途径中，水溶法制取钎剂的方法简便，更适于生产。     

铁水预处理脱磷剂的实验研究

本文从脱磷反应的热力学及动力学条件出发,在实验室的条件下,以CaO-Fe2O3-CaF2为脱磷剂的主要研究渣系,对不同配比关系的固体合成脱磷剂及预熔脱磷剂进行脱磷实验研究,得出适合铁水预处理的最佳配比关系的脱磷剂;在此基础之上,考虑用转炉渣、精细铁矿和烧结矿粉来代替脱磷剂中部分氧化剂和固定剂进行脱磷实验,确定其最佳配比关系。     

提高某型柴油机缸体球化率实验

采用南非优质生铁,福士科球化剂、孕育剂及采用覆盖0.2%?90#孕育剂,再覆盖0.4%的75FeSi孕育剂,混合冲入0.4%的39#孕育剂与0.2%的75FeSi孕育剂,再采用92#孕育剂进行瞬时孕育等工艺对提高某型柴油机缸体球化率具有明显作用.     

铝用氟化物钎剂的配制方法及对钎焊性能的影响

就铝用氟化物钎剂的不同配制方法进行了对比,测定了各种方法配制的钎剂组成,分析了配制机理,并对制取的钎剂进行了钎焊性能的测定.测定结果表明,四种钎剂的钎焊性能无多大差别.认为水调法、水煮法制取针剂方法简单,更适于生产.     

Al-Ti-B细化剂的应用

对ＬＳＭ５／１ＴｉＢＡｌ细化剂与国产同类产品进行了全面对比，指出国产细化剂细化效果普遍低于进口细化剂。文中对细化剂在熔体中的保持时间、加入量以及细化剂的成分、品种和被细化合金的种类对细化效果的影响进行了全面论述，并得出了可靠结论。细化效果数据，是通过国际通用的ＫＢ环法试验获得的     

Kupfer-, Nickel- und Titanlegierungen für Seewasseranwendungen

Copper and nickel alloys and titanium for seawater applications Copper and nickel alloys and titanium have been successfully used for heat exchangers on ships. In power plants and for chemical apparatus and piping systems because of their resistance against corrosion in sea water. Aluminium brass and copper nickel alloys, the standard materials for condensers and coolers, however, may be attacked, the corrosion depending on water quality, water velocity, and structural conditions. The mechanisms of corrosion are discussed. Under severe conditions the use of titanium may be indecated. The use of nickel base alloys is advantageous at elevated temperatures, e. g. for chemical reactions and for evaporation processes. Examples are given for application and for prevention of corrosion.     

On the need for more precise threshold values for chloride initiated corrosion

This paper stresses the need for focussing on a better understanding of the term ‘chloride threshold value’ for initiating reinforcement corrosion in concrete structures. It also focuses on the need for more precise values for modelling chloride ingress and for decision making in repair projects and finally on the need for a reliable internationally accepted test method for measuring the chloride threshold value. As a consequence no test results are presented. A provisional formula for design purposes and a test setup for testing the property are reintroduced.     

A new fractal model for anisotropic surfaces

A new fractal-based functional model for anisotropic rough surfaces is used to devise and test two methods for the approximate computation of the fractal dimension of surfaces, and as an instrument for simulating the topography of engineering surfaces. A certain type of statistical self-affinity is proved for the model, and this property serves as the basis for one of the methods of approximating fractal dimension. The other technique for calculating fractal dimension is derived from a Hölder type condition satisfied by the model. Algorithms for implementing both of these new schemes for computing a proximate values of fractal dimension are developed and compared with standard procedures. Both the functional model and its corresponding modified Gaussian height distribution are used for simulating fractal surfaces and several examples are adduced that strongly resemble some common anisotropic engineering surfaces.     

Research progress on refractory composition and deformability of shell molds for TiAl alloy castings

At present, most TiAl components are produced by an investment casting process. Environmental and economic pressures have, however, resulted in a need for the industry to improve the current casting quality, reduce manufacturing costs and explore new markets for the process. Currently, the main problems for investment casting of TiAl alloys are cracks, porosities, and surface defects. To solve these problems, many studies have been conducted around the world, and it is found that casting defects can be reduced by improving composition and properties of the shell molds. It is important to make a summary for the related research progress for quality improvement of TiAl castings. So, the development on refractory composition of shell molds for TiAl alloy investment castings was reviewed, and research progress on deformability of shell mold for TiAl alloy castings both at home and abroad in recent years was introduced. The existing methods for deformability characterization and methods for improving the deformability of shell molds were summarized and discussed. The updated advancement in numerical simulation of TiAl alloy investment casting was presented, showing the necessity for considering the deformability of shell mold during simulation. Finally, possible research points for future studies on deformability of shell mold for TiAl alloy investment casting were proposed.     

矿用高强度圆环链用钢的研究进展

介绍了矿用高强度圆环链的使用条件、力学性能及化学成分要求,分析了矿用高强度圆环链用钢23MnNiMoCr54的化学成分及其合金元素在钢中的作用以及23MnNiMoCr54钢的力学性能,讨论了矿用高强度圆环链用钢的现状和研究进展.     

Capturing Expert Knowledge for Supporting Design and Manufacturing of Injection Molds

Knowledge based approach is effective for renovating design and manufacturing processes. The objective of this paper is to investigate roles and usages of expert engineering knowledge in high-quality manufacturing, and to study a practical knowledge capturing method for realizing engineering support tools. An engineer oriented interface for a capturing method is proposed, and a flexible representation framework is studied for various types of expert knowledge. An integrated knowledge-based system has been developed for mold design support. The results have been evaluated by design and manufacturing of molds for cellular phones, and have shown substantial reduction of lead time for mold production.     

核设备不锈钢堆焊层下裂纹超声波检测技术

主要研究了奥氏体不锈钢堆焊层结构的特性及对超声波检验的影响。通过堆焊层下裂纹超声检验技术的理论分析和试验研究,确定了核电站设备不锈钢堆焊层下裂纹的超声检验技术。研究表明,采用60°／2MHz和70°／2MHz双晶纵波斜探头,对堆焊层下裂纹类缺陷有较高的检出率;采用45°／4MHz双晶纵波斜探头可有效测量堆焊层下裂纹的长度和自身高度。     

采用图形处理技术精确计算任意形状铸件重量的研究

针对复杂铸件，提出建立任意形状回转体，等厚体，锥体，台体及组合体等几何模型，通过图形处理技术，开发了铸件重量计算软件包，该软件使用方便，可快速计算任意形状铸件的重量，计算误差仅为２．５％左右。     

彩色显像管荫罩成形模的设计与修正

介绍了彩色显像管荫罩成形模设计与制造工艺,给出了荫罩成形模的设计流程。通过对荫罩成形机理的分析,提出了荫罩表面型面的数学表达式。为了保证模具设计的效果,采用荫罩表面测量设备对由该模具成形的荫罩进行直接测量,从而确定模具各个部位的修正量。经对某型号纯平彩色显像管荫罩模设计,取得了良好的效果。     

中俄储罐防腐标准对比分析

通过对比中俄两国储罐涂层技术标准,从储罐防腐层检查周期、储罐涂层设计寿命、储罐外表面防腐涂层的涂料技术条件、储罐内表面的防腐涂层、表面处理、涂装质量检验要求、消除防腐涂层缺陷等方面,分析了两国标准要求差异。最后,提出修订GB50393-2008时应增加完工后涂层的附着力检测方法;增加涂层缺陷的修复方法,并对整个绝缘涂层表面进行漏点检测等建议。