1汇报安排
题 目：参加第六届陶瓷国际大会总结报告会
时 间：2016年9月8日19:00-19:40
地 点：交大兴庆校区快速成型工程中心会议室
报告人：博1601班-陈义、博1334班-苗恺
2参加国际会议信息
会议名称：6th International Congress on ceramics(ICC6)
会议日期：21-25 August, 2016
会议地点：Dresden, Germany
会议简介：The International Congress on Ceramics (ICC) is hosted every two years by the International Ceramic Federation (ICF) in cooperation with the ICF member societies. The congress is intended to serve as a platform enabling an exchange of information on ideas and visions of the future for ceramics and inorganic materials.
会议交流工作:
Presentation：The mid-temperature strength of gelcast Al2O3 ceramic parts（汇报人：苗恺）
Presentation：The rapid fabrication of ceramc molds for double wall turbine blades（汇报人：陈义）
3参会论文信息
Title:The mid-temperature strength of gelcast Al2O3 ceramic parts
Author:Kai Miao, Zhongliang Lu, Yi Chen and Dichen Li
Abstract:Gelcasting is a well-established colloidal forming technique to enable near-net shaping of ceramic parts. However, being restricted to the mold opening process, fabrication of ceramic parts with complex internal structures cannot be easily realized by gelcasting. Based on the sterelithography (SL) technology, the integral fabrication technique (IFT) was put forward, allowing the fabrication of such ceramic parts by gelcasting. However, during pre-sintering of the IFT process, the strength degrades significantly between 400-600 °C (mid-temperature). The integrity of ceramic parts can be maintained only by the particle packing effects. In order to improve the mid-temperature strength, an AM/MBAM/silica sol gel system was put forward and polydimethylsiloxane (PDMS) were also introduced as mid-temperature
strengthen binder.
The results found both the compound gel system and PDMS had positive effects on the mid-temperature strength. The strength at 500 °C increased from almost zero to 0.6 MPa when 20 wt% silica sol and 15 wt% organic gel added. Meanwhile, after only adding 4 wt% PDMS, the bending strength at 500 °C was greatly improved from almost 0 to 1.037 MPa. After combine the two methods mentioned above, the strength further increased to 3.93 MPa. The distinct networks formed by PDMS and silica sol were responsible for the improvement in strength. The validity of this method was testified after fabricating a bulk ceramic mold for hollow turbine blade successfully.
Title:The rapid fabrication of ceramc molds for double wall turbine blades
Author:Yi Chen, Zhongliang Lu, Kai Miao and Dichen Li
Abstract:The double wall turbine blade (DWTB) contains multiple small cooling channels and fine film cooling holes. The complexity of its internal structures makes it difficult to be manufactured by the traditional nvesting casting. Based on stereolithgraphy (SL) and gelcasting technologies, the integral fabrication technique of ceramic mold for DWTB was put forward. However the tiny structures in the DWTB were ard to be filled by gelcasting. During debinding, the mid-temperature strength of ceramic and the debinding technic have direct influence on the integrity the mold. Meanwhile the high temperature strength should be guaranteed to prevent the crack of mould and fracture of core when casting metal.
In order to prepare ceramic slurry with low viscosity and high solid contents, the most compactly piling theory was applied to optimize the particle multilevel gradation of ceramic slurry, and the optimum volume fraction ratio of particles was obtained. The middle temperature performance of the ceramic mold was improved, after the ceramic mold was immersed by Al (H2PO4)3solution. The flexural strength of ceramic mold could increase from nearly 0 separately to 6.7MPa,3.8MPa and 0.8MPa under the temperature of 200℃,300℃and 500℃. The strength of the ceramic mold (at the temperature of 1500℃) was improved to 20MPa after adding Kyanite in the ceramic slurry.Finally, a double wall blade was fabricated successfully after casting, and all details inside were maintained.
欢迎各位感兴趣的同学届时前来交流。
