激光粒度分析仪测定特种陶瓷坯料粒度

根据多年实践研究与应用，分析了如何应用激光粒度分析仪提高特种陶瓷产品的质量问题，提出了一组较优化的粒度及其分布情况的控制指标，确定了较为合理的原料研磨时间。     

不同加工工艺对硅酸锆粉料粒度分布的影响

本文采用了3种不同工艺对锆英石砂进行粉碎，并用激光粒度分析仪对所得粉料进行了测试，实验表明：研磨时间和研磨工艺对硅酸锆粉料粒度大小及分布有较大的影响。     

激光光散射法测定粒度在陶瓷行业中的应用

本文介绍了激光光散射法测量粒度的原理,以及激光粒度分析仪的特点,并探讨了激光光散射法测量粒度在陶瓷生产中的应用。     

低温快烧熔块釉粒度分布对铬锡红系列色料发色的影响

研究了低温快烧透明熔块釉的粒度分布对铬锡红系列色料发色的影响。考察了适合铬锡红系列色料发色的粒度范围，研究了影响铬锡红系列色料在低温快烧熔块釉中发色的因素。     

超细硅酸锆粒度及纯度及对陶瓷釉乳浊性能的影响

通过选择国内外具有代表性的硅酸锆产品，分析其粒度和纯度对陶瓷釉乳浊性能的和影响，使其对国内为满足高档建筑卫生陶瓷需要超细硅酸锆的生产起到一定的借鉴作用。     

粉体粒度与研磨技术

本文概括了介绍了最常见的几种粉 粒度的测试方法。初探讨了在超细粉碎过程中的逆研磨问题以研 条件对研磨效率的影响。     

硅质材料的粒度与粒度分布对过滤器孔特性的影响

多孔陶瓷的孔特性(包括气孔率、孔径及分布、孔结构 )是影响其性能和功能的重要参数, 而在添加造孔剂法制备多孔陶瓷中, 各工艺因素都会影响到制品的孔特性.因此, 系统研究各工艺因素对多孔陶瓷的孔特性的影响, 将有助于找出解决办法, 精确控制多孔陶瓷孔特性, 从而制备出性能优良的多孔陶瓷.通过实验研究了硅质材料的粒度及粒度分布对多孔陶瓷过虑器孔特性的影响, 并提出了一些控制多孔陶瓷孔特性的有效措施.研究表明, 随着骨料粒径的减少, 过滤器的吸水率和气孔率增大, 随着骨料粒度分布范围变宽, 过滤器的吸水率和气孔率下降, 减少骨料粒度分布范围, 将形成较均匀的气孔结构.     

激光粒度仪测定碳酸钙粉体粒度的研究

以蒸馏水为分散介质,加入焦磷酸钠为分散剂,采用百特激光粒度仪测定研磨后的固体碳酸钙粉体的粒度分布,分别从仪器调试,样品处理和测试条件选择等几方面,以测定结果的D50值为参考,探讨引起测试结果误差的可能因素,从而优化了实验操作条件,提高了测定结果的准确度和精密度。     

样品粒度对差热分析影响的研究

研究了差热定量分析面积法的准确性和不同物料样品粒度对定性差热分析的影响。研究结果表明：对不同样品，粒度在20－250目范围时，昨用差热分析作定性分析，样品粒度对分析结果基本无影响，但用差热分析作定量分析时，要控制合理的样品粒度。     

关于控制水泥粒度分布的问题

以硅酸盐水泥为代表的水泥粒度组成,一般在0.3～90μm之间。在一定的矿物组成时,水泥的强度和硬化速度取决于粒度分布。但水泥的粒度分布则受粉磨工艺装备及作业控制的影响。现就水泥粉磨中控制水泥粒度分布的问题作简要论述。 1 微粉凝聚结团 球磨机是粉磨中的主要设备,在进行粉体加工时,粉磨能是由衬板传递给研磨体对物料进行冲击研磨的。因此,研磨体的尺寸及其级配非常重要。当磨机直径为2.0m,熟料的平均粒径为10mm时,利用邦德(Bond)     

Fabrication of New Porous Metal-Bonded Grinding Wheels by Hip Method and Machining Electronic Ceramics

Grinding wheels with different abrasive grains and different bonding materials were fabricated using hot isostatic press (HIP) sintering. Poly-crystal diamond powder of #1000 mesh size, single-crystal diamond powder of #1000 mesh size, and synthetic single-crystal diamond abrasive grains of #325 mesh size were used as abrasive grains. Cast-iron, and two different particle sizes of iron powders were used for the bonding material. The grinding capacity of these grinding wheels as well as conventional grinding wheels was evaluated by constant-pressure-grinding method to grind Al₂O₃-TiC component ceramics, which are typical electronic ceramics used for magnetic memory devices. The hardness of the bonding materials, the adhesion strength between abrasive diamond grains and the bonding materials, and the porosity of sintered body strongly relate to the grinding capacity. The porous bonded grinding wheels showed higher grinding capacity than the conventional wheels. The HIP method enables to fabricate excellent porous metal-bonded grinding wheels.     

卫生陶瓷坯料粉磨工艺的改进

介绍了卫生陶瓷坯料粉磨工艺的一项技术改进。生产表明,将碳酸盐类熔剂材料如石灰石、白云石、菱镁矿等原料与其它陶瓷原料的一次共同粉磨改为将碳酸盐类熔剂材料单独细磨筛分后再与其共同粉磨,收到良好的效果。用改进后的粉磨工艺制备的坯料泥浆注模、烧成,在降低烧成温度的条件下,获得了釉面外观质量佳的卫生陶瓷。     

A hot isostatic process for fabricating porous materials

Hot isostatic processing (HIP) is the latest method to produce open porous materials, such as ceramics or metals. In this review paper, features and applications of HIPed porous materials are described. Sintering behavior under high pressure gas is also discussed in order to understand how porous materials are obtained by this method. HIPed porous materials have higher open porosity, higher mechanical strength, narrower pore size distribution and higher fluid permeability than conventionally sintered ones. These excellent properties of HIPed porous materials are due to the enhanced surface diffusion caused by the high gas pressure. By applying these excellent properties of HIPed porous materials, filters, grinding wheels, and porous electrodes for electrochemical analysis can be produced with better properties than products made by conventional sintering.     

磁性生物活性陶瓷的制备

采用溶胶-凝胶法制备前驱体,经高温烧结制备出磁性生物活性陶瓷。利用体外实验方法,结合X射线衍射、扫描电子显微镜和红外光谱分析了材料结构、晶相和生物活性。结果显示,溶胶-凝胶法可制备出微细的非晶态前驱体粉末,经1 050℃烧结的玻璃陶瓷主晶相为β-硅灰石和铁酸钴、磷硅灰石。陶瓷粉末平均粒径为300 nm。烧结的材料在模拟人体血浆浓度的模拟体液中浸泡7 d,在材料表面可生成大量磷灰石,显示出较好的生物活性。     

Effect of zirconia content and particle size on the properties of 3D-printed alumina-based ceramic cores

Alumina-based ceramic cores are used to manufacture the internal structures of hollow alloy blades, requiring both high precision and moderate properties. In this work, zirconia is regarded as a promoter to improve the mechanical properties of sintered ceramic. The effect of zirconia content and particle size on the microstructure and mechanical properties of ceramics was evaluated. The results indicate that the flexural strength of sintered ceramics reached the maximum of 14.5 ± 0.5 MPa when 20 wt% micron-sized (10 μm) zirconia (agglomerate size, consistent with the alumina particle size) was added, and 26.5±2.5 MPa when 15 wt% 0.3 μm zirconia was added. Zirconia with submicron-sized (0.3 μm) particles effectively filled the pores between alumina particles, thus leading to the maximum flexural strength with a relatively low content. The corresponding sintered ceramics had a bulk density of 2.0 g/cm³ and open porosity of 59.6%.     

3D打印氧化硅陶瓷的制备及性能研究

随着陶瓷3D打印技术的发展,3D打印高性能陶瓷越来越受关注,在航空航天领域得到快速应用.通过研究分散剂、浆料pH、氧化硅粉体粒径和固相含量对浆料粘度和流动性的影响,可制备出粘度低、固相含量高、流动性好的陶瓷浆料.测试了不同固相含量对SiO2陶瓷的弯曲强度、烧成收缩率、气孔率和致密度的影响.结果表明:在68vol%的固相含量条件下,烧结后SiO2陶瓷的致密度达到74.32%,烧成收缩率为0.95%.     

陶瓷表面的水介质研磨

本文在工程陶瓷研磨试验的基础上，引入水合反就概念，讨论陶瓷表面的水介质研磨机理和工艺过程，比较水介质研磨和氧化铝磨砺 料研磨条件下的研磨表面质量和三在效率，以确定以水为介质研磨陶瓷的可行性。     

电子陶瓷和器件的低温共烧技术

较系统地介绍了电子器件用低温共烧陶瓷(low temperature cofired ceramics,LTCCs)材料,探讨了其工艺中的若干问题。电子器件用低温共烧陶瓷材料包括:玻璃/陶瓷复合材料、结晶化玻璃、晶化玻璃/陶瓷复合材料以及液相烧结陶瓷,其中典型的和最为常用的LTCCs为玻璃/陶瓷(特别是氧化铝)复合材料。正在研究的一些陶瓷介质材料中,Bi基介质材料引起了人们的关注。玻璃/陶瓷复合材料的制备工艺中,应当着重关注和加深了解玻璃的流动性和结晶性、玻璃的起泡、玻璃和陶瓷颗粒间的反应、共烧材料的匹配等问题,从优选材料配方和优化工艺着手,从而获得优质可靠的材质和器件。     

Recycling bagasse and rice hulls ash as a pore-forming agent in the fabrication of cordierite–spinel porous ceramics

Bagasse and rice hulls ash are both waste materials. In recent years, in order to meet environmental protection, these materials have been recycled in the production of porous ceramics. A solid-state reaction mechanism of calcined alumina and talc was used to prepare cordierite–spinel porous ceramics. Talc was added from 30 to 60 wt.% at the expense of alumina and sintered at 1400°C for 2 h. The effect of bagasse and rice hulls ash (as a pore forming agent) on the densification parameters, cold crushing strength (CCS), and pore size distribution was also studied. The phase composition (X-ray diffraction) and microstructure (scanning electron microscopy) of sintered samples were investigated. The results showed that the main phases present in the samples are cordierite, corundum, spinel, and sapphirine. In the sample with a higher amount of talc additions (60 wt.%), only the formation of the cordierite and spinel phases was observed. The bulk density of the samples and the apparent porosity ranged from 1.77 to 2.26 g/cm³ and from 28.6% to 48.21%, respectively. The CCS of the samples ranges from 13.9 to 36.3 MPa. The microstructures of the sintered samples were observed for the formation of cordierite phase, alumina phase, and spinel phase in an excellent crystallization and phase arrangement.     

Modeling of elastic properties and conductivity of partially sintered ceramics with duplex microstructure and different grain size ratio

The elastic constants and conductivity of partially sintered single-phase and two-phase ceramics (exemplified by alumina ceramics and alumina-zirconia composites, respectively) with different grain size ratio (from 1:1 to 1:4) are investigated by numerical modeling. The relative elastic moduli of partially sintered two-phase ceramics are shown to be relatively similar to those of single-phase ceramics, whereas the relative conductivity is significantly lower, because of the higher phase contrast. The more the grain size ratio deviates from unity, the higher is the initial packing fraction, and the lower are the relative elastic moduli and conductivity of the partially sintered ceramics. The porosity dependence of the Poisson ratio shows a decreasing trend which is only very weakly affected by the grain size ratio. Correlations between relative Young’s modulus and relative conductivity lie between upper and lower cross-property bounds. For single-phase materials the correlation lies below, for two-phase materials above, the Pabst-Gregorová cross-property relation.