NiO/YSZ陶瓷料浆的流变性质研究

本工作详细研究了碳黑粉、固含量、球磨时间、分散剂用量和pH值对NiO/YSZ陶瓷料浆流变性质的影响.结果表明:料浆均表现出剪切变稀行为,且为假塑性流体;确定了最佳实验参数,当pH=9,分散剂用量为2%(体积分数),球磨4h的NiO/YSZ水基料浆稳定性好,适合于成型SOFC的Ni/YSZ阳极材料,并最终制备出体积分数为50%,适合浇注的NiO/YSZ陶瓷料浆.     

氧化铝黑瓷浆料流变性能的研究

通过对氧化铝黑瓷粉料进行预烧技术处理,增大颗粒尺寸、降低粉体比表面能、改善其团聚现象,制备出固相体积分数达55%的氧化铝黑瓷稳定料浆,并研究了分散剂用量、体系固相体积分数、R值(塑性剂/粘结剂)对料浆流变性的影响.结果表明:浆料的粘度随剪切速率增加而下降,呈剪切稀化的流变学特性,随着固相体积分数的增加,浆料的最佳分散剂用量也相应增加;浆料的粘度随着R值的增加而急剧降低,流变性能得到明显改善.     

球磨工艺对Al2O3料浆及瓷体性能的影响

球磨过程是凝浇注成形工艺中制备高性能料浆的一个重要环节。研究了不同球磨方式和不同球磨时间对５５ｖｏｌ％Ａｌ２Ｏ３料浆粘度和流动性的影响，并将料浆用凝浇注工艺成形后烧结，分析球磨工艺对瓷体性能和微观结构的影响。认为延长球磨时间可改善料浆的性能和提高瓷体的质量，但球磨时间过长会因为颗粒细化而使料浆的粘度增大。     

改性甲基丙烯酸共聚物分散剂对陶瓷复合料浆流变性及坯体强度的影响

烯丙基聚氧乙烯醚与甲基丙烯酸和甲基丙烯酸甲酯可通过自由基共聚获得两亲结构的水溶性高分子MPMA , 可作为陶瓷浆料分散剂。研究了MPMA 用量对石英/ 长石/ 粘土复合浆料流变性及坯体强度的影响, 并分析了其原因及分散稳定作用机理。结果表明: MPMA 的加入显著优化了料浆的流变性能并提高了成型后陶瓷的强度。在p H 值为9～10 时, MPMA 的最佳用量为0. 57 wt %(相对绝干浆料) , 料浆的Zeta 电位绝对值由28. 5 mV升高到65. 5 mV , 零剪切黏度由690. 9 mPa·s 降低到81. 6 mPa·s , 触变面积最小, 陶瓷料浆基本呈Newton流动特性, 显示了很好的分散性。与添加无机分散剂的陶瓷坯体相比, 添加MPMA 的陶瓷坯体强度由160 MPa升高到268 MPa 。      

莰烯基碳/碳化硅料浆制备工艺研究

研究了分散剂种类及其用量对莰烯基碳黑料浆分散性的影响,研究了分散剂种类及其用量、固相含量、表面改性对莰烯基碳化硅料浆分散性的影响.通过优化制备参数,制备出炭黑含量为10％(质量分数),固相含量达70％(体积分数),在50s-1剪切速率下表观黏度为0.9Pa·s,满足室温冷凝浇注成型的莰烯基碳粉/碳化硅料浆.     

氧化石墨烯水泥浆体流变性能的定量化研究（英文）

采用流变仪和激光共聚焦显微镜对不同氧化石墨烯(GO)掺量的新拌水泥浆体的流变参数以及浆体微观形态进行了定量化研究,并采用Modified-Bingham(M-B)模型和Herschel-Bulkley(H-B)模型对所测数据进行了拟合处理,提出了GO影响新拌水泥浆体的作用机理。结果表明,GO的掺入可以使新拌浆体中在减水剂作用下分散的水泥颗粒发生再次凝聚,形成重组絮凝结构,且随着GO掺量的增加,重组絮凝结构的数量越多,从而使得浆体流变性发生显著变化。一方面,新拌浆体的塑性粘度、屈服应力以及触变性随GO掺量的提高而显著增加。另一方面,GO的掺入提高了新拌浆体的临界剪切速率,使其在较大剪切速率下的流变行为仍然表现为剪切变稀;降低了浆体的剪切增稠程度,提高了浆体的稳定性。     

氧化锆粉末特性和有机添加剂对流延法制膜的影响

用四种不同粒径的、全稳定的ZrO2粉料进行了燃料电池电解质厚膜的流延实验．结果表明，流延成膜的最佳料浆组成随粉料粒径有很大变化，随着粉料粒径的减少；所需要的分散剂用量相应增加，同时；所需要的粘结剂与塑性剂用量也必须增加，以确保素坯膜有足够的强度与韧性．此外，料浆粘度对成膜的影响也很大，在所研究的料浆系统中，为了得到好的素坯膜，适中的料浆粘度应控制在400～600mpas（剪切速率为350s-1）范围以内．     

壳寡糖可食性喷墨墨水的流变性

目的对可食性喷墨墨水的流变性进行研究,得到连接料壳寡糖的加入对墨水流变性的影响情况。方法通过剪切速率扫描实验和振幅扫描实验研究壳寡糖可食性喷墨墨水的流变性能,并且研究不同壳寡糖添加量对墨水流变性的影响。结果壳寡糖的质量分数由0变为4.2%时,墨水的剪切应力由3.823 Pa增加为4.837 Pa,剪切粘度由4.47×10-3 Pa·s增加为5.56×10-3 Pa·s,弹性模量由3.99×10-3 Pa减小为3.33×10-3 Pa,粘性模量由0.0199 Pa增加为0.0283 Pa,复数模量由0.0203 Pa增加为0.0285 Pa,应变相位差δ由78.75°增加为83.59°。结论壳寡糖的加入对于墨水剪切应力、剪切粘度、粘性模量、弹性模量和应变相位差δ都有一定的影响。     

影响高固相含量β-TCP浆料流变性因素的研究

为了制备出高固相体积含量、分散性好的β-TCP陶瓷浆料,系统地研究了影响β-TCP浆料流变性的因素如浆料的pH值、分散剂的用量、固相含量、球磨时间等.实验表明,当pH值=9时,加入2vol%左右的分散剂,球磨8h,能够制备出满足凝胶注模成型工艺的高固相含量、低粘度β-TCP/BG陶瓷浆料.     

硫酸钡型耐酸碳酸钙的制备

钡型耐酸碳酸钙在造纸和涂料工业中具有重要的价值。通过研究氯化钡加入量、碳酸钙料浆浓度、搅拌强度和硫酸钠浓度对硫酸钡包覆碳酸钙耐酸性的影响，得出了钡型耐酸碳酸钙的制备工艺：氯化钡加入量为1％，碳酸钙料浆浓度为15％，搅拌速率为150r／min，硫酸钠浓度为10％，制备的硫酸钡包覆型碳酸钙能耐pH为5．5的缓冲溶液的腐蚀。     

Electrokinetic properties of Nd:YAG nanopowder and a high concentration slurry with ammonium poly(acrylic acid) as dispersant

The electrokinetic properties of Nd:YAG nanopowder with particles of about 40 nm in diameter were investigated by measuring the zeta potential of a stable YAG (Y₃Al₅O₁₂) aqueous slurry. Ammonium poly(acrylic acid) polyelectrolyte was used as dispersant to adjust the electrokinetic properties of the Nd:YAG slurry. The effect of the pH of the slurry and of the polyelectrolyte concentration on the stability of the suspension are discussed in this study. The optimal pH value and the amount of dispersant needed to obtain a stable Nd:YAG nanoparticle slurry were determined. Highly consistent Nd:YAG nanoparticle slurries with optimal pH and dispersant concentration were prepared by ball milling. The rheological behavior of Nd:YAG slip with different solid loading (60–70 wt%) has been studied by measuring the viscosity and shear stress as a function of shear rate. Slip with solid loadings of 65 wt% shows near-Newtonian behavior but becomes non-Newtonian with typical shear-thinning behavior above this solid loading value. The density and microstructure of the cast product bears a direct relationship to the state of the slip induced by alternation of the pH and the concentration of the dispersant as well as the solid loading.     

氧化铝悬浮液剪切流变特性的研究

分析了柠檬酸铵(TAC,分散剂)稳定的氧化铝悬浮液的剪切流变行为,研究了TAC加入比例及颗粒大小对流变特性的影响.认为静态时悬浮液中存在由于颗粒布朗运动而形成的热力学颗粒簇,剪切变稀是在剪切作用下热力学颗粒簇分解的结果,而剪切稠化源于剪切作用下水力学颗粒簇的形成.通过悬浮液中颗粒成簇势垒概念的引入,提出悬浮液的低剪粘度和高剪粘度分别取决于氧化铝颗粒表面的ζ电位和Stern电位,通过加入过量的柠檬酸铵可以抑制悬浮液的剪切稠化,推导出了剪切稠化临界剪切速率与颗粒粒径关系的数学表达式.     

ZTA陶瓷注凝成型浆料流变性能的研究

研究了ZTA陶瓷注凝成型浆料流变性能的影响因素.结果表明:单体(AM)在液相中质量百分浓度为10%、交联剂与单体的比(MBAM/AM)较低时,悬浮体粘度较低;浓悬浮体粘度和剪切应力随分散剂掺量增加而减小,拟合的流变模型倾向为Herchel Bulk;ZrO2原料的粒度对浆料流变性有重要影响,较粗ZrO2原料对浆料流变性影响不大,占少量的超细ZrO2决定了ZTA浓悬浮体的性质;试验条件下研磨时间以9h为最佳.     

Characterization of magnetic dispersions: Rheological, mechanical and magnetic properties

The rheological properties of magnetic oxide dispersions have been studied, varying dispersing agent, magnetic oxide, milling time and oxide loading level. Magnetic properties of handcoats as well as mechanical and magnetic properties of free films prepared from these dispersions have also been studied. The results show a good correlation between rheological, magnetic and physical properties. As a result, rheological measurements can be a convenient and powerful tool for evaluating the dispersibility of a magnetic oxide and the efficiencies of formulation components such as dispersing agents. Rheological measurements can also determine optimum oxide loading, optimum dispersant level, and optimum milling time. Results show that for a given oxide, there exists an oxide-binder ratio where mechanical, rheological and magnetic properties are optimized. This optimum suggests the existence of a well-defined oxide-binder structure. Results at oxide loadings lower and higher than the optimum can be explained, respectively, on the basis of individual particles with no long range structure formation and on the basis of possible clustering of particles.     

Suspension characteristics and rheological properties of mullite/zirconia powder in methyl isobutyl ketone

Particle size and its distribution, sedimentation bulk density and rheology of mullite, zirconia, and mullite/zirconia mixed suspensions have been studied in terms of oxide loading (20, 30 vol%), and types of additives (dispersant, dispersant/plasticizer, dispersant/plasticizer/binder). Polyester/polyamine, dibutyl phthalate, poly(vinyl butyral), and methyl isobutyl ketone have been used as the dispersant, plasticizer, binder, and liquid medium, respectively. Sedimentation density significantly increased upon adding dispersant; the effect was more pronounced with zirconia suspension most likely due to the fine and hence high specific surface area of zirconia. With further addition of plasticizer and plasticizer/binder, the sedimentation density decreased. The suspension viscosity generally behaved in an opposite manner to the sedimentation density, i.e., low sedimentation density gave high low-shear viscosity, indicative of high order structure formation in the suspended particles. High shear rate rheology showed a shear thinning and its onset began at lower shear rate with higher solid loading. Mullite/zirconia mixed suspension gave intermediate sedimentation and rheological behavior, implying the two types of particles are non-interacting.     

中间相碳微球悬浮体的流变性及凝胶注模成型工艺的研究

以Tween 80为分散剂,制备了水基中间相碳微球(MCMB)悬浮体.Zeta电位测定 结果表明,当Tween 80的用量为1％(以MCMB质量分数计)时,该悬浮体的Zeta,电位绝对 值可达到55mv(pH=7).进一步研究了分散剂用量和固含量对悬浮体流变学性能的影响,发现 悬浮体最佳分散剂用量为1％,随固含量的增加,其粘度也逐渐增加.在此基础上,制得了固含 量达到62.5wt％(53.1vol％)的悬浮体.研究了凝胶注模成型素坯及烧结体的力学性能及显微结 构,并通过该工艺制备了形状复杂的碳板材料.     

Dispersion and Rheological Properties of Alumina/Zirconia Slurries with Methyl Isobutyl Ketone/Ethanol Solvents

The dispersion and rheological behavior of alumina, zirconia, and alumina/zirconia mixed slurries were investigated using various solvent ratios of methyl isobutyl ketone (MIBK)/ethanol (EtOH), by measuring sedimentation bulk density, particle size distribution, and viscosity. Well-dispersed suspensions were obtained in MIBK-rich solvents with additional dispersant and in EtOH-rich without dispersant. The shear viscosity of the slurries was dependent on both the Al₂O₃/ZrO₂ ratio and MIBK/EtOH ratio. At a constant solvent ratio, however, similar rheological behavior was shown regardless of the relative amounts of the two solids. At low shear rate, a Newtonian plateau was absent in the Al₂O₃/ZrO₂ slurries. With increasing shear rate (>600 s^–1), Al₂O₃ slurries exhibited a Newtonian plateau while ZrO₂ demonstrated continuous shear thinning.     

植物纤维基包装材料中纤维悬浮体流变行为研究

目的 采用可再生的植物纤维机械搅拌制备植物纤维悬浮体系,探究纤维悬浮液的流变性影响因素和体系中纤维的分散与取向,为后续工业化产品的加工和运输设计奠定基础。方法 利用旋转流变仪测试纤维质量分数、长径比（纤维长度）、温度和水溶性高分子等各个因素对体系流变性能的影响。结果 纤维悬浮体系为非牛顿流体,表现剪切变稀现象。溶液的黏度随温度的变化经线性拟合符合Arrhenius方程。纤维质量分数、长径比（纤维长度）的提高均会增加体系表观黏度,促进纤维的分散及网络结构形成,而温度的提高,黏度会呈指数形式减小。加入水溶性高分子PVA和聚丙烯酰胺分散剂均会提高体系黏度,有助于纤维的分散;PVA醇解度越高,亲水基团越多,易与纤维产生更多氢键作用,形成纤维网络结构,有助于后续发泡结构控制,醇解度过高则易凝胶化。阳离子型CPAM有助于改善纤维表面负电荷,破坏纤维静电吸附,使得纤维分散更均匀。结论 纤维质量分数、长径比（纤维长度）、体系温度等因素会影响纤维悬浮液流变特性,水溶性PVA和分散剂聚丙烯酰胺的加入有助于纤维的分散,对工业化纤维浆料配比加工具有参考意义,同时体系的黏流特性有利于生产线浆料输送系统的设备设计...