射频CO_2激光陶瓷基板划片机

介绍了RFCO2激光器及其陶瓷基板划片的特点;分析了RFCO2激光陶瓷基板划片的机理,给出了整机总体设计方案。对导光系统的激光束进行了模拟,给出了导光系统的光路图及聚焦镜焦平面处的光斑尺寸及能量分布图,整机性能指标达到国外进口机的水平。     

射频激光对氧化铝陶瓷基片划片的研究

分析了射频CO2激光陶瓷基板划片的机理及工艺参数选择的原则，通过数值模拟和实验，分析了脉冲频率、脉冲宽度、划片速度、辅助气压大小、离焦量等工艺参数对激光划片质量的影响。     

臭氧发生器用Al2O3陶瓷基板材料的改性研究

研究了掺杂成分MgO,TiO2,Y2O3,MgTiO3,CaTiO3对臭氧发生器用Al2O3陶瓷基板材料的体积密度、介电常数、介质损耗、热导率等性能的影响,实验结果表明,较合适的掺杂配方是Y2O3 0.6wt%,MgTiO3 0.2wt%,CaTiO3 0.2wt%。     

臭氧发生器用Al_2O_3陶瓷基板材料的改性研究

研究了掺杂成分MgO、TiO2 、Y2 O3 、MgTiO3 、CaTiO3 对臭氧发生器用Al2 O3 陶瓷基板材料的体积密度、介电常数、介质损耗、热导率等性能的影响 ,实验结果表明 ,较合适的掺杂配方是Y2 O3 0 .6wt %、MgTiO3 0 .2wt %、CaTiO3 0 .2wt%     

V500型CO＿2激光机及其Al＿2O＿3电子陶瓷基板加工技术

主要介绍了V500型CO2激光机的结构、原理以及加工电子陶瓷基片的相关技术,利用激光加工α-96%Al2O3陶瓷基板,是满足厚膜混合集成电路等产品生产和科研需要的主要方法之一。     

硅橡胶/陶瓷复合膜反应器中CO2合成甲醇(Ⅱ)过程行为分析

以在膜反应器中进行的CO2加氢合成甲醇的复杂反应(平行反应)体系为模型反应建立了等温一维拟均相膜反应器并流模型,运用Runge-Kutta法对膜反应器中的反应过程行为进行模拟,并讨论了Da、α、Φ、pr、q1、T、γ和L1等参数对反应过程行为的影响.     

CO2激光辐照诱变选育纳豆芽孢杆菌高抗菌活性菌株

应用红外CO2激光辐照纳豆芽孢杆菌bacillus subtilis natto S252,经分析测定,结果得到一高抗菌活性突变株F604,对指示菌金黄色葡萄球菌及大肠杆菌试验,发现抗菌活性比出发菌株分别提高1.26和1.43倍（抑菌圈直径）;同时证实F604具有高抗菌活性的继代稳定性,说明CO2激光辐照在菌株诱变方面卓有成效。     

CO2压缩机三段冷却器的思考

换热器是化工企业常见的设备,换热器的运行状况关系整个系统能否长周期稳定运行.气体对于温度的敏感程度更甚,气体冷却降温到指标控制范围,是系统稳定运行的重要保障之一.通过更换三段换热器管束,不仅使换热器出气温度下降到指标范围,同时也降低了3.8 MPa蒸汽消耗,可取得良好的经济效益.     

Ultrafiltration of W/CO2 Microemulsions in Ceramic Membranes

Abstract

Water‐in‐CO₂ (W/CO₂) reverse microemulsions stabilized with 1100 Da poly(ethylene glycol)‐poly(propylene glycol)‐poly(ethylene glycol) block copolymer were recovered using an ultrafiltration ceramic membrane in a custom high‐pressure cross‐flow separation unit. Viscosity‐corrected liquid CO₂ flux (298 K) through the membrane was investigated as a function of time and surfactant concentration to determine the cake layer mass transfer resistance. Rapid CO₂ flux decline was observed with increasing surfactant concentration, denoting cake layer buildup on the membrane surface. For instance, at 0.09 and 0.55 wt% surfactant, the ratio of cake resistance to membrane resistance was 0.4 and 3.8, respectively. Based on our previous work, the reverse‐micelles retain their aqueous core and are not altered during filtration. Ultimately, inorganic membrane separations can reduce energy consumption associated with compression/expansion cycles typically used in CO₂‐based processes.     

激光粒度测定法检测陶瓷粉体的粒度

以真空致密氧化铝陶瓷和镁橄榄石陶瓷研磨烧块为例，分析了其粒度检测结果，确定了这些粉体的粒度组成特点。指出，由激光辐射衍射法测定的平均粒子体积尺寸可以作为表示研磨烧块粒度的标准。     

添加剂对多孔陶瓷载体氧化铝涂层的影响

在以SB粉为原料,HNO3为解胶剂制得的稳定AlOOH溶胶中加入添加剂(PEG、PVA),对多孔陶瓷载体进行了表面涂层.考察了添加剂对AlOOH溶胶粘度的影响;BET法测定了AlOOH溶胶中加入添加剂后多孔陶瓷载体氧化铝涂层比表面积的变化;由SEM照片观察多孔陶瓷载体涂层前后表面和断面的形貌;超声波振荡检测了氧化铝涂层的附着牢固度.结果表明,在AlOOH溶胶中加入一定量的添加剂可以使溶胶的粘度增加,提高溶胶在载体表面的附着力;制备的多孔陶瓷载体氧化铝涂层均匀、牢固且比表面积增大.但加入过量的添加剂,会导致AlOOH溶胶胶凝化.     

Corrosion Resistance of Ceramic Coating on Steel Substrate

Fe/Al2O3 ceramic coating was made by spraying and sol-gel. The corrosion resistance between Fe/Al2O3 ceramic coating and steel 45# was studied. By microscope and X-ray diffraction, the binding and the composition of the interface were also analyzed. The results showed that Fe/Al2O3 ceramic coating had dense struc- ture, less porosity and better binding with the substrate which was effective to prevent erosive liquor immersing into the inside of ceramic coating. Some substances that distributed homogeneously in Fe/Al2O3 ceramic coating, such as α-Al2O3, FeAlO3 and Fe3Al, could improve the corrosion resistance of this material.     

Ceramic Supported PDMS and PEGDA Composite Membranes for CO2 Separation

Composite membranes have attracted increasing attentions owing to their potential applications for CO2 separation. In this work, ceramic supported polydimethylsiloxane （PDMS） and poly （ethylene glycol） diacrylate （PEGDA） composite membranes were prepared. The microstructure and physicochemical properties of the compos- ite membranes were characterized. Preparation conditions were systematically optimized. The gas separation performance of the as-prepared membranes was studied by pure gas and binary gas permeation measurement of CO〉 N2 and H〉 Experiments showed that PDMS, as silicone rubber, exhibited larger permeance and lower separation factors. Conversely, PEGDA composite membrane presented smaller gas permeance but higher ideal selectivity for CO2/N2. Compared to the performance of those membranes using polymeric supports or freestanding membranes, the two kinds of ceramic supported composite membranes exhibited higher gas permeance and acceptable selectivity. Therefore, the ceramic supported composite membrane can be expected as a candidate for CO2 separation from light gases.     

制备电子陶瓷基片用的流延成型工艺

流延成型是目前生产电子陶瓷薄片常用的方法之一.本文简要介绍了流延成型工艺过程,综述了流延成型技术中的浆料组成、厚度控制、干燥工艺、脱脂工艺等关键工艺的研究现状,并分别对影响各工艺的因素进行了分析.     

Diode-Pumped Tm:YAG Ceramic Laser

Highly transparent Tm:YAG ceramic was fabricated by a solid-state reaction and vacuum sintering. The optical properties, the microstructure, and the laser performance of the Tm:YAG ceramic were investigated. A Tm:YAG ceramic with an average grain size of ∼10 μm was obtained by sintering at 1750°C for 10 h. The in-line transmittance was 84.0% at 2015 nm. The absorption coefficients at 681 and 785 nm were 8.23 and 3.27 cm⁻¹, respectively. The grain boundaries were clean and no secondary phase was observed. The 6 at.% Tm:YAG ceramic slab (1.2 mm × 5 mm × 6 mm) was end-pumped by a laser diode at 792 nm, and the maximum output power of 4.5 W was obtained with a slope efficiency of 20.5% at 2015 nm.