镁质耐火材料用结合剂的应用进展

镁质耐火材料被广泛应用于钢铁冶金等领域，其结合剂种类不仅会影响其质量，还会影响其在高温状态下的显微结构和使用性能。综述了镁质耐火材料用结合剂的基本分类，结合剂在镁质不定形耐火材料和镁质耐火材料制品中的应用情况，并对镁质耐火材料结合剂的应用提出了一些建议。     

苯乙烯-异戊二烯-丁二烯三元乳液共聚合反应研究

以去离子水为分散介质、歧化松香酸钾和脂肪酸钠为乳化剂、十二硫醇为链转移剂、磷酸钠为电解质、过硫酸钾为引发剂,在50℃下,通过乳液聚合的方法合成了苯乙烯、异戊二烯、丁二烯三元共聚物(ESIBR)。考察了聚合温度、引发剂、链转移剂、电解质用量对三元乳液共聚合速率的影响,通过红外光谱仪(FTIR)与核磁共振(1H-NMR)对三元共聚物的组成及微观结构进行了分析表征。结果表明,随着聚合温度的升高,聚合速率显著加快,反应诱导期缩短;随着引发剂用量的增加,聚合反应速率增大;在实验范围内,链转移剂与电解质用量对共聚反应速率无明显影响。单体质量配比为S/I/B=28/36/36时,转化率在70%以内,共聚物中结合苯乙烯含量随着转化率的提高而增加,结合苯乙烯质量分数由20%增至26%;结合异戊二烯量随转化率的提高而降低,结合异戊二烯质量分数由47%降至41%;而结合丁二烯量却无明显变化,其质量分数基本都在33%左右。     

结合剂对氧化铝体系长水口内衬材料结构与性能的影响

为改善免预热长水口内衬氧化铝材料的使用性能,以氧化铝空心球、板状刚玉和α-Al_2O_3微粉为主要原料,分别以磷酸二氢铝溶液(磷酸二氢铝与水的质量比为7 3)和木质素磺酸钙溶液(木质素磺酸钙与水的质量比为1 1)-黏土为结合剂制备了长水口内衬Al_2O_3材料,研究了结合剂含量(磷酸二氢铝溶液的外加质量分数分别为2%、4%、6%、8%和10%,黏土的外加质量分数为4%,木质素磺酸钙溶液的外加质量分数分别为2%、4%、6%、8%和10%)和热处理温度(950和1 550℃)对试样结构与性能的影响。结果表明:950℃热处理后,两种结合体系的试样均以α-Al_2O_3相为主,以磷酸二氢铝为结合剂的试样中出现了AlPO_4相;两种结合体系的试样均未发生烧结;以木质素磺酸钙-黏土为结合剂的试样的体积密度、常温抗折强度和热导率随结合剂含量的增加而升高,线膨胀率基本相同;以磷酸二氢铝为结合剂的试样的体积密度、常温抗折强度和热导率随结合剂含量的增加先升高后降低,并且由于石英型AlPO_4相变作用,试样在500～600、700～800℃出现了急剧膨胀现象; 1 550℃热处理后,以磷酸二氢铝为结合剂的试样发生明显的烧结现象,体积密度和强度升高;以木质素磺酸钙-黏土为结合剂的试样由于碳的阻碍作用,强度随结合剂含量增加而下降。综合考虑各项性能,磷酸二氢铝溶液和木质素磺酸钙溶液适合加入量(w)分别为4%和2%。     

新型陶瓷结合剂及陶瓷浇注料

介绍了近年来研究制成的新型陶瓷结合剂和陶瓷浇注料,分析了新型陶瓷浇注料的质量特性,证明了使用高稠度陶瓷结合剂服液生产浇注料不但能提高产品质量,而且可以减少资源消耗,保护环境,是当今陶瓷注料生产中最理想的结合剂。     

陶瓷砖倒角加工用金刚石砂轮的试验研究

研究了适应目前建筑陶瓷对于边角质量有了更高的要求精细倒角、平直光滑,产品经济耐用,连续使用时间长,而且性价比高的树脂结合剂金刚石倒角砂轮。介绍了从三聚氰胺甲醛树脂、酚醛树脂、聚酰亚胺树脂,再到选用新酚复合树脂作结合剂的演化,再从耐磨增强材料铜粉到铝粉的过渡,研发生产出了性价比高的树脂结合剂金刚石倒角砂轮。     

石墨对金属结合剂金刚石磨具性能的影响

采用正交实验法,通过测定金属结合剂金刚石磨具的磨耗比,结合考虑磨具的力学性能,综合地研究了不同石墨种类、粒度和含量对金属结合剂金刚石磨具性能的影响。实验结果表明：当添加质量分数为3wt%、粒度为80目的鳞片状石墨时,金属结合剂金刚石磨具的磨耗比最大,达到206.62,并且力学性能良好,锋利度高。故其综合性能良好,具有较高的使用价值。     

钢筋混凝土金刚石薄壁钻头用结合剂及金刚石的研究

通过对影响钢筋混凝土金刚石薄壁钻头主要质量因素--结合剂、金刚石浓度、粒度和品级的大量室内试验研究表明,采用高钴结合剂、高品级、中等浓度的金刚石制作钢筋混凝土金刚石薄壁钻头的使用性能较佳.     

LNG冷剂压缩机安装技术与质量管控

结合大型LNG工厂建设实际经验,分别从安装准备、基础验收及处理、机组到货验收、冷剂压缩机安装技术要求和安装质量管控方面,探讨了LNG冷剂压缩机的安装技术与管理思路。     

相同骨架相含量下W基和WC基金属结合剂烧结性能对比分析

设计W基和WC基金属结合剂配方体系并进行相同工艺条件下的烧结实验,对两种结合剂的烧结性能进行了对比分析,对烧结体微观结构进行了表征,并对结合剂基质材料对金刚石的包镶情况进行了讨论。结果表明:相同烧结工艺时WC基金属结合剂的烧结性能相对较好,力学指标略高于W基金属结合剂,但W基金属结合剂对金刚石的包镶能力更好,表现为强度损失率更低。SEM电镜表明,由于烧结温度的影响,W基金属结合剂的烧结质量相对较差,烧结体内空隙较多。另外,烧结体内基质材料对金刚石的把持以机械包镶为主,但由于W是一种强碳化物形成元素,因此该结合剂烧结体内金属基质材料在金刚石颗粒表面有一定的粘覆,从而提高了把持力。     

疏松砂岩油藏挤封技术研究与应用

针对疏松砂岩油藏普通水泥封堵成功率低的问题,进行了高强度封堵剂的研究与应用,解决了常规堵剂易漏、微收缩、易破碎的问题。配套了可取式挤封桥塞封堵工艺技术,实现了堵剂与工具的有机结合,同时强化现场施工质量控制,满足了疏松砂岩挤封需求。     

Molecular dynamics simulation and experimental study of the bonding properties of polymer binders in 3D powder printed hydroxyapatite bioceramic bone scaffolds

Binder properties are a key factor affecting the quality of bone scaffolds produced using 3D powder printing. In this research, molecular dynamics simulation (MD) and experimental methods were applied to study the cohesive energy density, mechanical properties, bonding behavior, and surface morphology of three polymer binders (PVP, PAM, PVA) employed in the 3D fabrication of hydroxyapatite (HA) bone scaffolds. The bonding mechanisms of the three polymer binders were revealed by analyzing the interaction between the binders and the HA surface. The binding energies between the binders and HA are associated with the cohesive energy density and viscosity of each of the binders, which are attributed to functional groups in the binders. The mechanical properties determined experimentally for the bone scaffolds produced using each of the three polymer binders were in a different relative order than the engineering modulus of the binders and the interaction between the binders and HA calculated in simulations. This is a reflection of the mechanical properties of bone scaffolds being a comprehensive reflection of the basic materials and their bonding effect. Finally, SEM imaging indicated additional factors affecting the mechanical properties and degradation rate of the scaffolds. Conclusions from this work can be used to forecast the properties of three commonly used polymer binders and provide a theoretical basis for the choice of binders in the production of 3DP-fabricated bone scaffolds.     

气化型煤的生产

概述了无机黏结剂型煤、有机黏结剂型煤和复合黏结剂型煤生产技术.在型煤生产中,要考虑煤本身的变质程度、弹塑性等特点,合理选用黏结剂和生产工艺是提高型煤质量的保证.最后指出,近年来气流床气化技术取得了较大的发展,但鉴于固定层气化技术固有的特性,今后还有相当的存在空间,为型煤技术的发展造就了美好的前景.     

Effect of ceramic binders on microwave dielectric loss of alumina

Abstract

Several binders have been evaluated to determine their effect on high frequency dielectric loss. Alumina ceramics have been powder pressed with different binder levels, sintered, and then the dielectric loss (tan δ = Q^-1) has been measured at approximately 9·5 GHz. The quality factor Q was determined and significant differences were observed between samples made with different binders. The differences are caused by the different levels of residual porosity left by the different binders. In addition, differences in levels of impurities in the binders may also influence Q. Selected samples were measured for green body strength as a function of binder content.     

粘结剂对碳纳米管电极性能的影响

利用扫描电子显微镜．电极接触角和电极充放电等测试手段．研究了不同种类粘结剂和粘结剂含量对电极的影响．结果表明：采用酚醛树脂作为电极的粘结剂效果最好,当其质量占电极质量的15％时,电极的性能达到最佳。     

A simple mix design method for self-compacting concrete

This paper proposes a new mix design method for self-compacting concrete (SCC). First, the amount of aggregates required is determined, and the paste of binders is then filled into the voids of aggregates to ensure that the concrete thus obtained has flowability, self-compacting ability and other desired SCC properties. The amount of aggregates, binders and mixing water, as well as type and dosage of superplasticizer (SP) to be used are the major factors influencing the properties of SCC. Slump flow, V-funnel, L-flow, U-box and compressive strength tests were carried out to examine the performance of SCC, and the results indicate that the proposed method could produce successfully SCC of high quality. Compared to the method developed by the Japanese Ready-Mixed Concrete Association (JRMCA), this method is simpler, easier for implementation and less time-consuming, requires a smaller amount of binders and saves cost.     

型煤粘结剂研究现状

型煤技术是洁净煤技术之一,而型煤粘结剂是型煤生产的关键技术,对型煤质量、生产成本等起着重要作用。型煤粘结剂的研究对能源发展和环境保护具有重要意义。本文简单介绍了型煤的成型机理,重点介绍了有机、无机及复合型粘结剂的研究现状以及特点,并对粘结剂的发展作出了展望。     

铝碳质耐火材料研究进展及展望

高温烧成铝碳质耐火材料是一种由氧化铝和炭素为基体原料,加入Al、Si、SiC等添加剂,用沥青或树脂等结合剂黏结烧成的耐火材料,被广泛应用于高炉炼铁、铁水预处理、炼钢、连铸等冶金工序中.耐火材料组成是其获得优质性能的基础,整理分析耐火材料中各组分对性能的影响,可以为开发低成本优质耐火材料提供理论支持和研究导向.本文总结了...     

Pelletization of magnetite ore with colemanite added organic binders

A new generation binder consisting of an organic binder and a borate salt was tested as an alternative to bentonite in magnetite ore pelletization. Carboxyl methyl cellulose (CMC), Ciba DPEP06-0007 and corn starch, and calcined colemanite were used as organic binders and the borate salt, respectively. They were added to the pellet feed separately and in different combinations at several addition levels. It was found that the use of organic binders is sufficient in terms of wet pellet quality; however, they fail to render the required compressive strength to pre-heated and fired pellets. Therefore, organic binders and calcined colemanite were used together so that wet pellets, pre-heated and fired pellets would be of the required quality. The results showed that the use of an organic binder together with calcined colemanite indeed yielded pellets with equal or better wet and indurated pellet qualities compared to the pellets produced with bentonite binder alone.     

Binders based on aqueous dispersions of polymers for plastic shaping of ceramic products

Some special features of the deformation behavior of plastic corundum mixtures and semifinished products with temporary technological binders based on aqueous dispersions of polyvinyl acetate and polymethyl acrylate are considered. As compared to conventional binders, the new binders widen the range of the plastic state of the mixtures with preservation of a high level of molding properties and make it possible to increase the strength of molded preforms. It is shown that the binders are applicable for shaping articles from narrow-fractionated powders.     

生物基胶黏剂在玻璃纤维湿法薄毡中的应用与发展

介绍了玻璃纤维用传统型胶黏剂存在的缺陷与不足,阐述了生物基胶黏剂的发展情况及其在玻璃纤维行业领域里的应用,重点介绍了新型生物基胶黏剂在玻璃纤维湿法薄毡领域中的应用情况,并展望了生物基胶黏剂的发展前景。