粉末金属压制过程建模方法(2)--广义塑性力学方法和内蕴时间方法

介绍了建立描述粉末金属压制过程数学模型的难点，详细论述了目前4种主要的建模方法，分析、比较了各种方法的优劣，并对建模工作提出了展望和指导性意见。     

Effect of cooling rate and laser process parameters on additive manufactured Fe–Ti–C metal matrix composites microstructure and carbide morphology

In this paper, laser additive manufacturing (LAM) of Fe–TiC composite coating on AISI 1030 carbon steel is investigated using a numerical and experimental method. In order to have a desired result using LAM, it is crucial to understand the effects of the process parameters’ values on the TiC morphology and microstructure. For this purpose, the LAM process is numerically simulated in order to calculate cooling rate and peak temperature. Experimental data and numerical results are in good agreement in terms of the phase development. Results show that cooling rate plays a crucial role in phase transformation in the clad, however, final microstructure strongly depends on the cooling rate and powder's chemical composition. Two main carbide morphologies (i.e. dendritic and particulate) are studied and relevant cooling rates are detected. Based on this paper and developed map, it is possible to control the cooling rate in order to achieve specific carbide morphologies in the clad. In this study, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) are used to characterize clads’ microstructure.     

改性氢氧化钙粉体的研制及其特性

介绍了作为氯气清除剂的粉体应具有的特性,并对粉体的研制方法进行了简单叙述。同时,对改性氢氧化钙粉体特性作了详细介绍。不难看出,研制的改性氢氧化钙粉体具有高度活性,与氯气捕消器配合使用,将成为氯气泄漏时的抢险措施     

Transfer of powders into flammable solvents overview of explosion hazards and preventive measures

This paper evaluates and analyses the explosion hazards associated with transfer operations of powders into large containers, hoppers and reactors, which may also contain flammable solvent vapours. The formation and characteristics of explosive atmospheres and the occurrence of process inherent ignition sources, such as static electricity are described. The most commonly applied preventive measures and technical equipment are outlined and discussed including their advantages and disadvantages.     

Prevention and suppression of explosions in gas-air and dust-air mixtures using powder aerosol-inhibitor

The prevention and suppression of explosions is a very topical field of research because annually hundreds of coal mine workers became their victims. In this research a very effective powder “powder for suppression of explosions” (“PSE”) for the suppression of explosions has been developed and tested. The experiments on suppression of explosions of a methane–air mixture (MAM) at a laboratory conditions using “PSE”-powder have been carried out. The possibility of lowering the power of coal-dust explosion with the help of a “PSE”-powder has been investigated. The feasibility of almost instantaneous disperse of powders using intentionally created mini-explosions (ammonal) was investigated. The barrel-suppressor of explosion in the experimental adit (tunnel) was studied and the large-scale tests for suppression of MAM-explosions in experimental adit were also subjects of study.     

Machining efficiency of powder mixed near dry electrical discharge machining based on different material combinations of tool electrode and workpiece electrode

Powder mixed near dry electrical discharge machining (PMND-EDM) is a novel electrical discharge machining (EDM) process. It is proposed to further improve the machining efficiency of dry EDM. The principle of material removal in PMND-EDM is illustrated and its deionization principle is proposed. The influence of residual heat on MRR is analyzed. The concept of superfluous residual heat is proposed. The material removal rate (MRR), the main index of machining efficiency for PMND-EDM process, is researched. Single factor experiments are performed to get effect of peak current, pulse on time, pulse off time, flow rate, tool rotational speed, air pressure and powder concentration on MRR under different material combinations of tool electrode and workpiece electrode. Thermal phenomena in PMND-EDM are illustrated. Effect of each process parameter on MRR of PMND-EDM is gotten and analyzed based on the deionization principle of PMND-EDM. Differences in MRR under different material combinations are found out. Brass tool electrode and W18Cr4V workpiece gain higher MRR under most of discharge conditions, while the superiority of copper tool electrode and 45 carbon steel workpiece in MRR arise when there is improper heat dissipation. The difference is analyzed based on the deionization principle of PMND-EDM.     

光催化降解有机磷农药中甲胺磷的降解效率的测定

采用纳米TiO2光催化降解甲胺磷农药，分别测定分析了PO^3-4,有机磷农药，COD等，以说明光催化降解甲胺磷的情况，结果说明纳米TiO2光催化降解甲胺磷是可行的，根据我们及他人光催化降解有机磷农药的实验结果，比较了分别通过测定TOC，CO2，PO^3-4，有面农药，COD等各种不同的分析方法来衡量光催化降解效率，以评定催化剂的活性及光催化法的可行性的优缺点，以便根据样品的实际情况以及实验室所具备的仪器设备，选择合适的分析方法。     

我国废旧轮胎的再循环利用

总结了我国废旧轮胎的再循环利用技术及利用途径 ,指出我国废旧轮胎的回收利用应以生产胶粉或其他方式为主 ,再生胶将逐渐减少     

粉末金属压制过程建模方法(3)--微观力学方法

介绍了建立描述粉末金属压制过程数学模型的难点，详细论述了目前4种主要的建模方法，分析、比较了各种方法的优劣，并对建模工作提出了展望和指导性意见。     

X射线粉末法计算晶胞参数及粉末图指标化的微机程序

本文介绍了一个用BASIC语言编写的微机程序,即CDI程序。该程序是根据最小二乘修正加上外推的原理编制的,用于粉末衍射数据的晶胞参数计算和粉末图指标化。CDI程序可以处理所有晶系的衍射数据并得出令人满意的计算结果。程序已在IBMPC/XT,长城0520CH及C.S.重型微机上运行了好几年并解决了一系列实际问题。