玻璃渗透氧化锆全瓷牙科材料制备工艺的研究
文献类型：学位论文
| 作者 | 靳彤安 |
| 学位类别 | 硕士 |
| 答辩日期 | 2008-05-23 |
| 授予单位 | 中国科学院过程工程研究所 |
| 授予地点 | 过程工程研究所 |
| 导师 | 朱庆山 |
| 关键词 | 渗透 氧化锆 玻璃 牙科材料 |
| 其他题名 | Study on Fabrication of Glass-Infiltrated Zirconia All-Ceramic Dental Composite |
| 学位专业 | 化学工程 |
| 中文摘要 | 最近十几年在牙科固定修复领域中，全陶瓷材料已经大量使用于临床，逐渐替代传统的金属烤瓷材料。全瓷牙科修复材料以其优良的美观性和生物相容性受到广泛的青睐。陶瓷材料固有的脆性断裂和加工成型比较困难的特点一直是全瓷材料应用中研究者致力于解决的问题。 在本课题组前期的研究中，开发了氧化锆—玻璃复合材料，选用具有良好的强度和断裂韧性的钇稳定四方相氧化锆（3Y-TZP），玻璃渗透技术可以满足尺寸小、形状复杂的牙科修复体的成型要求。但现有的玻璃渗透技术在氧化锆陶瓷的应用中存在坯体预烧温度过高，渗透所需时间较长的缺点。本论文的研究内容从氧化锆粉体成型，到坯体预烧和玻璃渗透，直接针对材料的实际加工条件，降低氧化锆多孔坯体的预烧结温度，提高渗透速率，探索和改进整套加工工艺。 在渗透用多孔坯体成型工艺的研究中，选择不同的3Y-TZP粉体，使用干压和注浆法成型两种方法成型。开发了适用于3Y-TZP粉体的水性调配液，浆料可以达到75%质量分数的固相含量，注浆法成型后，预烧结温度降低至1200℃，坯体预烧结过程中坯体的线收缩率小于0.5%，达到“净成型”要求。研究了不同的成型方法和不同的预烧结温度对于坯体孔结构的影响，相同预烧结温度下，注浆法成型坯体平均孔径较干压法大，颗粒大的粉体成型预烧后气孔尺寸显著增大。使用不同工艺制备的多孔预烧坯体孔隙率在30-40%，氧化锆晶体基本全部为四方相，适于渗透加工。 研究了熔融玻璃和多孔坯体各种因素对渗透过程的影响。玻璃成分决定了玻璃的高温粘度，表面张力以及与3Y-TZP的润湿性，对于渗透过程影响最大，多孔坯体的孔径也直接影响到了熔体渗入的速率。通过对玻璃成分的微调，玻璃的热膨胀系数达到10.8×10-6 K-1与3Y-TZP匹配良好，减少了渗透过程中的弯曲变形情况，同时改善了玻璃渗透温度下与3Y-TZP发生反应的现象。研究了多孔坯体孔尺寸对于渗透速率的影响，基本满足渗透距离的平方与渗透时间成正比的Washburn关系式。在坯体制备过程中，可以通过对坯体孔径的控制来优化渗透速率。经过优化的多孔坯体可以在15min中，渗透3mm的厚度，比原有材料有了大幅度提高。 最后总结了两种制备工艺和材料性能。压制法高温预烧的粉体可以制备预烧结瓷块，切削加工后用于渗透，弯曲强度达到400MPa。注浆法可以直接使用粉体在石膏模型上成型，预烧和渗透过程基本无体积变化，满足“净成型”要求，预烧和渗透温度不超过1200℃，渗透时间短，只需15min之内就可以完成渗透，设备成本低，加工周期短，材料的弯曲强度为285MPa。 |
| 英文摘要 | In the last few decades, All-ceramic dental restorations have been widely used in clinical and gradually replace traditional metal ceramic materials. Dental ceramics in restorations provide excellent chemical durability, wear resistance, biocompatibility and esthetics. The processing difficulties and brittle behavior of all-ceramic materials was the issue most researchers focused on. A new zirconia-glass dental composite prepared by glass melt infiltration was developed in former work of our group. A 3% yttria stabilized zirconia (3Y-TZP) was adopted with a glass-infiltration method. High pre-sintered temperature of 3Y-TZP matrix and long infiltration time limited the application of this material. The objective of present study was to optimize the fabrication process, including modification of powder property, control of pre-sinter condition and improvement of infiltration process. Forming method of ceramic powder and pre-sinter process was investigated. Dry pressing and slip casting was used to form 3Y-TZP powder. With slip casting method, the slurry of 3Y-TZP reached about 75wt% solid content. Green bodies shaping by slip casting could pre-sintered at a lower temperature about 1200℃ with a nearly free shrinkage (<0.5%). Slip casting obtained larger pore size in the same pre-sinter condition. Porous green bodies of tetragonal zirconia were fabricated with porosity 30-40%, suitable for infiltration. In melt infiltration process, the viscosity, surface tension, and wetting behavior of infiltration glass influenced chemical capability and infiltration rate. The reaction between glass and 3Y-TZP was minimized by modification of glass ingredient. The coefficient of thermal expansion of glass reached a high of 10.8×10-6 K-1 which matched the ceramic better. The in filtration rate and pore diameter of the porous green bodies followed the Washburn equation. The infiltration rate could be improved by structure optimization of porous green bodies. A 3mm infiltration distance was achieved in 15min by the optimized porous matrix and glass. Tow fabrication methods of zirconia-glass dental composite were used to prepare the materials. Dry pressing method could be used to manufacture pre-sintered ceramic blocks, infiltrated after machine shaping, which with strength of 400MPa. Slip casting method could be used to forming restoration materials directly by plaster mold. The pre-sinter and infiltration temperature of slip casting method was below 1200℃, and the infiltration could be completed in 15 minutes. Strength of material prepared by this method is about 285MPa. |
| 语种 | 中文 |
| 公开日期 | 2013-09-13 |
| 页码 | 66 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1212]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 靳彤安. 玻璃渗透氧化锆全瓷牙科材料制备工艺的研究[D]. 过程工程研究所. 中国科学院过程工程研究所. 2008. |
入库方式： OAI收割
来源：过程工程研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。