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采用金相显微镜、扫描电镜及能谱、电子探针和X射线衍射对高Cr铸造镍基高温合金K4648等轴晶和定向凝固铸件的合金/陶瓷型芯界面反应进行了系统研究，获得反应时间与反应量关系的界面反应动力学曲线、不同反应时间的反应界面形貌及产物的种类。结果表明：高Cr铸造镍基高温合金K4648与铝基型芯不易发生反应，而与硅基陶瓷型芯发生剧烈的界面反应，反应产生金属瘤状凸起物，造成铸件内腔破坏。此外，白色的硅基型芯内部...
Processing of polysiloxane-derived porous ceramics: a review
Processing polysiloxane-derived porous ceramics a review
2010/10/12
Because of the unique combination of their attractive properties, porous ceramics are considered as candidate materials for several engineering applications. The production of porous ceramics from pol...
注射成形AlN高导热陶瓷蜡基粘结剂
AlN 陶瓷粉末注射成形 粘结剂
2011/1/13
研究并开发了一种适合于AlN陶瓷注射成形的蜡基多聚合物粘结剂.通过理论计算分析了所用粘结剂组元的热力学相容性,利用毛细管流变仪测量了喂料的流变性能,通过热重分析方法研究了粘结剂的热分解行为,有效地指导了脱脂工艺的设计,并通过考察不同温度下的脱脂形貌研究了脱脂工艺的合理性.研究结果表明:当粉末装载量为61%时(体积分数),该粘结剂体系和粉末能够均匀、顺利地混合,喂料的流变因子范围为0.70~0.76...
Trend report on international and Japanese standardization activities for bioceramics and tissue engineered medical products
Trend report international Japanese standardization activities for bioceramics tissue engineered medical products
2010/10/12
Since porous and injectable bioceramics have recently been utilized often as scaffolds for bone regenerative medicine, the need for their standardization has increased. One of the standard proposals i...
Stem cell technology using bioceramics: hard tissue regeneration towards clinical application
Stem cell technology bioceramics hard tissue regeneration towards clinical application
2010/10/12
Mesenchymal stem cells (MSCs) are adult stem cells which show differentiation capabilities toward various cell lineages. We have already used MSCs for treatments of osteoarthritis, bone necrosis and b...
Dielectric spectroscopy study of Ba0.98Na0.02Ti0.98Nb0.02O3 ceramic
Ceramics Phase transitions Ferroelectrics
2010/1/11
The dielectric spectroscopy method was applied to measure frequency and temperature dependence of complex dielectric permittivity, complex admittance, phase angle. The frequency dependence of ac condu...
The influence of the sintering conditions on the properties of the stainless steel reinforced with TiB2 ceramics
AISI 316L stainless steel TiB2 ceramics Sintering
2010/1/11
The paper analyzes the influence of the temperature and pressure on the properties and structure of the austenitic AISI 316L stainless steel reinforced with 1% vol.TiB2 ceramics.
Purpose: Titanium diborides (TiB2) ceramic is particularly interesting because it exhibits high elastic modulus
and hardness as well as high thermal conductivity. The interest in TiB2 ceramic increas...
Solidification analysis of AMMCs with ceramic particles
Composites Casting Solidification analysis Silicon carbide
2009/12/1
Purpose: In the research work the result of the reinforcement displacement and solidification analysis for aluminium
cast composites with ceramic particles have been presented. The results of researc...
面向过程工业的陶瓷膜制备与应用进展
陶瓷膜 材料设计 面向应用
2009/11/25
陶瓷膜具有优异的化学稳定性、机械稳定性及分离性能，在过程工业中获得了成功应用，成为我国膜领域中最有国际竞争力的膜品种之一。本文基于面向应用过程的膜材料设计的理论框架，系统概述了陶瓷膜的定量制备技术、面向应用体系的陶瓷膜选择与设计方法以及膜应用过程中污染控制的研究进展，并对未来我国陶瓷膜领域的发展态势进行了分析和研讨。
机械转动在机械能助渗铝技术中的作用
机械转动 机械能助渗铝；表面活性
2009/11/18
机械能助渗铝技术是通过机械能与热能相结合，可以明显降低渗铝的温度与保温时间的一种先进工艺方法. 研究结果表明：机械能助渗铝在600℃下保温3h可以得到100μm以上的渗铝层；机械能助渗铝过程中由于滚筒持续的机械转动增加了渗铝剂与试样表面之间、渗剂内各组分之间的接触几率. 颗粒与试样之间的摩擦能净化试样表面，增强表面活性，加快铝原子在试样表面的反应形核速率；由颗粒冲击而形成的大量晶体缺陷降低了扩散激...
TiO2含量对微波介质瓷ZrxTi1-xO2致密化、微结构及介电性能的影响
微波介质瓷 钛酸锆 致密化
2009/11/13
制备了一系列ZrxTi1-xO2(x =0.40~0.60)微波介质瓷，对其致密化、微结构及介电性能进行了研究. XRD物相分析样品为单一均相的ZrTiO4. 在相同的烧结温度下，TiO2含量越高，样品越不易致密，相对密度越低，晶粒越易长大. 样品的相对密度越高，其介电常数和品质因数越大. 相对密度高于90%时，对样品介电性能的影响可以忽略，成份起主导作用. 随着TiO2含量增加，样品的介电常数增...
玻璃渗透氧化锆全陶瓷牙科材料的制备和表征
渗透 玻璃 牙科陶瓷 3Y-TZP
2009/11/13
开发了一种适合渗透多孔四方相氧化锆的玻璃，并通过玻璃渗透工艺制备了氧化锆-玻璃全陶瓷牙科材料. 研究表明，该渗透玻璃在渗透温度下(1100~1200℃)具有合适的粘度、良好的渗透性和化学相容性，且热膨胀系数与氧化锆匹配；熔融态玻璃通过毛细管作用力填充预烧后的多孔四方相氧化锆坯体的孔隙，形成氧化锆和玻璃相互交融的致密的三维网络结构，渗透过程中没有发生氧化锆从四方相到单斜相的转变. 该氧化锆-玻璃复合...
玻璃渗透氧化铝全瓷牙科修复材料的颜色性能
牙科陶瓷 氧化铝 玻璃渗透
2009/11/13
以CeO2, Fe2O3, Er2O3为着色剂，制备不同颜色的Al2O3渗透玻璃，并渗透入预烧结的多孔Al2O3坯体，用分光光度计测量渗透后Al2O3-玻璃复合材料的反射光谱和颜色参数，考察了着色剂含量对材料颜色的影响. 结果表明，CeO2能赋予材料黄色品，对降低明度和增加红色品作用较弱；Fe2O3能赋予材料红色品并显著降低明度；Er2O3能增加红色品，对明度和黄色品影响较小. 得到的色度范围为L...