云母的加工与应用

介绍了白云母、绢云母、金云母、黑云母材料的加工方法及应用现状,并对云母材料的综合利用进行了系统的总结,同时探讨云母矿的采矿与选矿工艺现状。     

基于多变量前馈的再热汽温自动控制应用研

In the thermal system of the super (super) critical thermal power unit,the reheat cycle is generally used to improve the power generation efficiency.If the reheat steam temperature is too high,the creep speed of the boiler metal materials will be accelerated,which will affect the service life;if the steam temperature is too low,the thermal efficiency of the unit will be reduced,and the erosion of the final stage blades of the steam turbine will be aggravated.For the control of the reheated steam temperature,the reheater flue gas baffle or the swing burner is generally used for adjustment,and the reheater accidental water spray is used as an auxiliary temperature reduction adjustment.In addition to traditional control methods,control strategies have developed many control methods including advanced algorithms and intelligent prediction.These control strategies are either difficult to set parameters,or focus on theoretical research,or require external controllers,so many power plants still choose DCS internal control methods.It was applied to a 600 MW supercritical unit in a plant,using methods such as big data processing and visualization to analyze the thermal characteristics of the factors affecting the reheated steam temperature,found out the relevant laws,and carried out logical optimization to more accurately and efficiently treat the reheated steam.The temperature was controlled to stabilize parameters,reduced the amount of water spray,and achieved energy saving,efficiency enhancement and safe and stable operation.     

我国矿物材料的研究现状与发展趋势

在分析了当前非金属矿和矿物材料定义的基础上，结合多年来矿物材料研究和教学的体会，讨论了矿物材料的定义与分类；阐述了矿物材料的深度加工与矿物的可改造性、深度加工方法的研究现状，指出了当前矿物材料发展趋势。     

难加工材料的切削加工性研究与实践

以难加工材料的切削加工性的分析与研究为核心,在加工方法和工艺措施方面进行了有益的尝试,在切削加工领域具有一定的引领作用和借鉴意义。     

Multi-scale modeling in microstructure evolution of materials

1 IntroductionDevelopment of new materials depends on the try and error process for human beings in past long his-tory .It is dreamed to design and control materials intellectually . Computational materials science can bebelieved beginning at 1964 if alloy designis assumedto be the first successful attempt totailor properties ofmaterials quantitatively[1]. However , computational materials science has become a popular researchbranchjust within past ten years thanks to the intensive research ac…     

Multi-scale modeling in microstructure evolution of materials

Intelligent design and control of the microstructure to tailor properties of materials is the dream that materials scientists have been worked hard for many years. Formation of research area of computational materials science paves the way to realize the dream. Simulation of microstructure evolution is a chief branch of the computational materials science and has caused great attention from materials researchers. Multi-scale modeling gets popular just within 5- 6 years recently due to huge research works to try to shorten the distance between simulation and application. People have to command one or more classical simulation methods in order to do the multi-scale modeling so chief simulation methods will be discussed first and then more reviews in detail are given to the phase field simulation. The main part of the paper is carried out to introduce two key approaches to do the multi-scale modeling job. It is suggested that extension of the multiscale modeling is necessary to study the technologies to link microstructure simulation, processing simulation and property simulation each other as well as to build bridges between different simulation methods and between analytical models and numerical models.     

Multi-scale modeling in microstructure evolution of materials

Intelligent design and control of the microstructure to tailor properties of materials is the dream that materials scientists have been worked hard for many years. Formation of research area of computational materials science paves the way to realize the dream. Simulation of microstructure evolution is a chief branch of the computational materials science and has caused great attention from materials researchers. Multi-scale modeling gets popular just within 5- 6 years recently due to huge research works to try to shorten the distance between simulation and application. People have to command one or more classical simulation methods in order to do the multi-scale modeling so chief simulation methods will be discussed first and then more reviews in detail are given to the phase field simulation. The main part of the paper is carried out to introduce two key approaches to do the multi-scale modeling job. It is suggested that extension of the multiscale modeling is necessary to study the technologies to link microstructure simulation, processing simulation and property simulation each other as well as to build bridges between different simulation methods and between analytical models and numerical models.     

热线法测定散体硫化矿石导热系数

设计制作了热线法测试材料导热系数的试验装置,测试了0~1,1~2,2~4,4~6,6~8,8~10 mm 6种粒径的散体硫化矿石在25～120 ℃之间的导热系数。测试结果显示了散体导热的复杂性和非线性：各种粒径下矿石的导热系数都随温度上升而缓慢增大,在试验温度范围内基本上呈直线关系;相同温度下,矿石导热系数随粒径变化的关系曲线整体类似抛物线。由误差分析可知,单次测试的总误差都在4%以内;导热系数推算公式和热线电阻的理想化处理以及电流和温度测量仪表的固有误差是试验误差的主要来源,其中电阻和电流带来的误差最大。     

高温硬岩空气潜孔锤钻头设计

干热岩试验性开发井钻井施工,在高温硬岩的地层条件下,如何实现高效钻进仍存在很多技术难点。空气潜孔锤钻进技术是解决硬岩地层钻进的有效方法之一,潜孔锤钻头是空气潜孔锤钻进的关键器具。根据青海共和干热岩GH-01井空气潜孔锤钻进技术应用情况,分析探讨了空气潜孔锤钻头断齿、掉齿、磨损严重、使用寿命短等问题,从钻头结构设计、钻头材料选取、钻头冷压固齿工艺等几个方面对空气潜孔锤钻头进行了优化。固齿优化过程中采用有限元分析方法,对钻头冷压固齿过盈量进行仿真分析计算,根据分析计算结果确定最优固齿过盈量。通过对潜孔锤钻头结构、材料、加工等优化,为适用于高温硬岩的空气潜孔锤钻头研制提供了借鉴。为提高空气潜孔锤钻进综合效率,为干热岩钻探开发提供了技术支持和技术储备。     

浅析煤矿避难硐室的主要控温方法

针对避难硐室温度较高,采用蓄冰降温和二氧化碳汽化降温两种方式进行了原理阐述,对相变材料的优点进行了分析,为煤矿井下避难硐室的温度控制提供了可靠方式方法.     

Fe3O4/埃洛石复合材料制备及其对铅锌选矿废水中有机物降解性能的研究

铅锌有色金属矿选矿废水中残留大量的有机选矿药剂,COD浓度高达165 mg/L,远超废水的国家排放标准,将其直接回用亦会对选矿指标带来不利影响.为降解废水中残留的有机药剂,使其达到排放或回用标准,通过热分解法将四氧化三铁(Fe3O4)纳米颗粒负载于埃洛石天然矿物表面,制备得到Fe3O4/埃洛石复合材料,并将其作为类芬顿...     

The effect of modification of matrix on densification efficiency of pitch based carbon composites

Using coal tar pitch as a matrix precursor to prepare carbon materials is widely used by impregnation/carbonization processing technology. Four different grades of coal tar pitch and a natural pitch were characterized in terms of carbon yield, density, viscosity, and fractionation with solvents, as well as by thermal analysis methods. The suitability of these commercially available matrices for densification of 3 dimensional carbon-carbon composites was examined. The theoretical results compared with experimental results. The highest density after impregnation was obtained using one of the coal tar pitches. The predicted results are in reasonable agreement with experiment data. The significance of this research is that a special heat treatment regime was conducted. The effects of modification temperature on the densification efficiency of composites were investigated and then structure and characteristics of the composites were determined by scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and X-Ray Diffraction (XRD).     

固体材料质量减少成形工艺的运动方式分析与应用

基于构成机械零件的几何表面形成方法的论述,具体分析了固体材料质量减少成形工艺的运动方式。为形成新的质量减少成形工艺、拓广成形设备的加工范围及设备的更新、改造提供了一条新的思路。     

我国超微细高岭土的研究现状

以高岭土的主要性质及其结构特点为基础,介绍了超微细高岭土的机械超细粉碎方法及研究现状,同时介绍了超微细高岭土插层的研究现状以及在新材料中的应用。     

海泡石表面电性研究

海泡石的表面电性对加工及开发应用有很大的影响 ,因此有必要对海泡石的表面电性进行研究。本文考察了纤维状及土状海泡石原料的 ζ电位 ,以及悬浮液酸度、分散剂种类、不同加工方法、阳离子活性剂用量等因素对ζ电位的影响 ,并探讨了其原因     

粉末工艺合成金刚石中参数的选取

通过实验考察了粉末材料合成金刚石中工艺参数对合成效果的影响, 讨论了粉末材料合成金刚石中工艺参数的选取原则。实验证明, 合成压力、温度与时间是影响合成效果的重要参数。合理的选取工艺参数, 有利于合成优质金刚石。     

Interreg IV – Projekt GeoResources: Natursteinressourcen in Nord-, Ost- und Südtirol – Vorkommen,Eigenschaften und Bedarf

As part of the project “GeoResources” (Interreg IV) the project partners in Tyrol and South Tyrol investigated mineral building raw materials and their local resources. Classifications for these raw materials will be derived from the geological-mineralogical data and the technical characteristics. Aspects like transport, processing, impact on the environment etc. shall influence this assessment. Together with possible uses, sustainability and economic aspects of resources, this will lead to universal survey criteria for future analysis. As a second intention it is planned to develop a kind of chart showing decision techniques for cost-efficient and effective methods of exploration.     

Fine milling in applied mechanochemistry

This review paper is devoted to application of mechanochemistry in extractive metallurgy, crystal engineering, materials engineering, coal industry, building industry, agriculture, pharmacy and waste treatment. In extractive metallurgy the most commercially attractive potential applications using fine milling (Activox, Melt) will be illustrated. Mechanochemical approach in crystal and materials engineering will focus on the non-equilibrium processing of materials and their current and potential applications. In agriculture the technological advantages of mechanochemical methods over traditional methods for improving the solubility of natural phosphates will be documented. In pharmacy, the selected examples of fine milling application will show the improved bioavailability of drugs. The examples of fine milling utilization in coal industry, building industry and waste treatment are also given. Simplification of the processes, ecological safety and the product extraordinariness characterize the application of fine milling in mechanochemistry.     

40Cr电动机传动轴轴颈的焊补及焊后加工工艺

针对实际生产过程中电动机传动轴轴颈损坏的问题,结合实际生产经验,选用合适的焊接材料、焊接方法和焊后加工工艺,克服了普通焊接工艺焊接电动机传动轴产生的焊接裂纹和焊接变形量大等问题,大幅度地降低维修成本,提高了生产效率。     

嵌段共聚物及其在制备高比表面积介孔材料中的应用

介孔材料因具有比表面积大、孔径分布均一及结构有序的特性,被广泛应用在催化剂载体、吸附材料及分离介质等领域。本文介绍了嵌段共聚物的结构特征及其在选择性溶剂中的自组装行为,综述了以嵌段共聚物为模板剂,采用溶胶-凝胶(sol gel)法制备高比表面积、高热稳定性介孔材料的控制过程,影响因素及制备非硅体系介孔材料的技术特性。