采用低品位石灰石烧制水泥熟料的研究

以低品位的石灰石为原料,通过合理的配料方案,成功制备了性能优异的水泥熟料。通过岩相观察和XRD分析结果表明,实验所用生料易烧性较好,并随温度提高而明显改善,所制备的水泥熟料的主晶相是C3S和C2S。     

放电等离子烧结制备Ti3SiC2材料的研究

本文报道分别以Ti/Si/C,Ti/SiC/C为原料，采用放电等离子烧结工艺制备Ti3SiC材料的研究结果，以元素单质粉为原料，掺加适量Al作助剂能加速Ti3SiC2的反应合成并提高材料的纯度，在1200－1250℃的温度下能制备出经XRD，SME和EDS表征不含TiC和SiC等杂质相的纯净Ti3SiC2材料，而以Ti/SiC/C为原料时，有无Al作助剂都难以制备出纯净的Ti3SiC2，其反应合成温度明显高于以元素单质粉为原料的。     

新标准条件下立窑厂的配料与生产

以两水泥厂的实施情况为例论述了立窑水泥厂采用高KH、高SM、高SM方案生产优质硅酸盐水泥的方法。并介绍了采用此种配料方案改善生料易烧性的途径。     

熔融盐在蓄热混凝土中传热过程的数值模拟

用数值模拟的方法对熔融盐与蓄热混凝土组合式换热模型进行了研究．该组合模型以混凝土为蓄热介质,熔融盐（Hitec）为传热介质,分析混凝土的导热系数、流体管道长度、热流体进口温度与进口流速等因素对蓄热单元储热规律及其特性的影响。计算结果表明：当混凝土的导热系数在2．0～3．0W/（m·K）左右、管长为0．5—2m、热流体进口温度为420℃、进口流速为O．15～0．25m／s时,蓄热单元可获得较高的储热效率。     

采用磷渣为原料烧制水泥熟料的研究

采用磷渣为原料,通过合理的配料方案,成功制备了性能优异的水泥熟料。通过岩相观察和XRD分析结果表明,实验所用生料易烧性较好,并随温度提高而明显改善,所制备的水泥熟料的主晶相是C3S和C2S。     

铜基复合材料的研究

综述了7种制备铜基复合材料的工艺机理、特点,以及Cu/Al2O3,Cu/WC,Cu/TiB2,Cu/Ti3SiC2 4种复合材料的研究进展.内氧化法主要用于制备Cu/Al2O3复合材料,其氧含量控制困难,成本昂贵;机械合金化法可制备超细颗粒强化的铜基复合材料,具有工艺简单,成本相对较低的特点,缺点是耗能大,易混入杂质;溶胶-凝胶法可制备超细氧化铝强化的铜基复合材料,工艺过程易控制;液相反应法可用来制备性能优良的Cu/5%TiB2复合材料,基体中颗料的含量、尺寸和分布易控制;固相反应生成法产品纯度高,易获得复杂相和亚稳定相,但产品致密度不高;反应喷射沉积法制得的产品晶粒细小,无宏观偏析,颗粒分布均匀,生产工艺简单,生产效率高.最后还分析了铜基复合材料研究中存在的问题.     

CaF2掺杂与二次烧结对Ca3Co4O9结构的影响

采用CaF2掺杂固相烧结法制备了Ca3Co4O9热电材料,通过与纯样对比,讨论了掺杂与二次烧结工艺对其显微结构的影响,实验结果表明：掺杂CaF2有利于Ca3Co4O9片状晶体组织的生长,进行二次烧结,对Ca3Co4O9材料矿物的形成更为有利。     

Cu/Ti3SiC2新型受电弓滑板材料的研究

选用具有高导电、高导热性的新型陶瓷Ti3SiC2作为弥散强化相,通过与Cu的混合,采用热压和无压烧结后制备成Cu/Ti3SiC2复合材料.该材料是一种具有优良性能的新型受电弓滑板材料.实验中分析了掺杂含量、保温时间及烧结制度等因素对复合材料基本性能的影响.     

Effect of Modified Vermiculite on the Interface of a Capric Acid-expanded Vermiculite Composite Phase Change Material with Phase Transition Kinetics

A new type of capric acid(CA)-acid expanded vermiculite(AEV) composite phase change material(PCM) with improved adsorption ability and interface adhesive strength was developed. Through the analysis of non-isothermal phase transition kinetics, modified vermiculite was observed to change and affect the phase transformation mechanism of the composite. AEV was treated with hydrochloric acid to improve the specific surface area and micro-pore structure. The surface area measured by BET increased from 81.94 m~2/g for expanded vermiculite(EV) to 544.13 m~2/g for AEV. CA-EV and CA-AEV composite PCMs were prepared by direct impregnation. The non-isothermal phase transition isotherms of CA-EV and CA-AEV were recorded by DSC at different heating rates(1, 5, 10, 15, and 20 ℃/min), which indicated that the phase transition rate increased with the heating rate and the phase transition process changed. Kinetics parameters were analyzed by a double extrapolation method. The activation energy(E) under the original state(E_(α→0)) of CA-AEV and CA-EV was 1 117 kJ/mol and 937 kJ/mol, respectively, and 1 205 kJ/mol and 1 016 kJ/mol under the thermal equilibrium state(E_(β→0)). The most probabilistic mechanism function of CA-AEV satisfied G(α)=α~(2/3), which followed the Mample special rule, and the function of CA-EV satisfied G(α)=[(1+α)~(1/3)-1]~2, which followed the anti-Jander function.     

Fabrication of Al<Subscript>2</Subscript>O<Subscript>3</Subscript>-NaCl composite heat storage materials by one-step synthesis method

Thermal energy storage is an attractive option for effectiveness since it gives flexibility and reduces energy consumption and costs. New composite materials for storage and transformation of heat of NaCl-Al₂O₃ composite materials were synthesized by one-step synthesis method. The chemical composition, morphology, structure, and thermal properties were investigated by XRD, EDS, SEM, and DSC. The results show that NaCl can be absorbed by Al₂O₃ particle from 800 to 900 °C for Al₂O₃ particle surface is rich active structure. The results also indicate that the leakage of NaCl when the phase change can be prevented by Al₂O₃ particles and the enthalpy of phase change of NaCl-Al₂O₃ material is 362 J/g. The composites have an excellent heat storage capacity. Therefore, this study contributes to one new thought and method to prepare high temperature heat storage material and this material can be applied in future thermal engineering.