Injection molding and debinding of micro gears fabricated by micro powder injection molding
来源期刊：International Journal of Minerals Metallurgy and Materials2013年第1期
论文作者：Xin-lei Ni Hai-qing Yin Lin Liu Shan-jie Yi Xuan-hui Qu
文章页码：82 - 87
摘 要：Micro powder injection molding （μPIM） was investigated for possible mass production of micro-components at relatively low cost. However, scaling down to such a level produces challenges in injection molding and debinding. Micro gears were fabricated by μPIM from in-house feedstock. The effect of injection speed and injection pressure on the replication of the micro gear cavity was investigated. Solvent debinding and thermal debinding processes were discussed. The results show that micro gears can be successfully fabricated under the injection pressure of 70 MPa and the 60% injection speed. Either too low or too high injection speed can cause incomplete filling of micro gears. The same is the case with too low injection pressure. Too high injection pressure can bring cracks. Solvent debinding of micro gears was performed in a mixture of petroleum ether and ethanol. Subsequently, micro gears were successfully debound by a multistep heating schedule.
Xin-lei Ni1，Hai-qing Yin1，Lin Liu2，Shan-jie Yi1，Xuan-hui Qu1
1. School of Materials Science and Engineering, University of Science and Technology Beijing2. School of Mechanical and Electrical Engineering, China University of Mining and Technology (Beijing)
摘 要：Micro powder injection molding （μPIM） was investigated for possible mass production of micro-components at relatively low cost. However, scaling down to such a level produces challenges in injection molding and debinding. Micro gears were fabricated by μPIM from in-house feedstock. The effect of injection speed and injection pressure on the replication of the micro gear cavity was investigated. Solvent debinding and thermal debinding processes were discussed. The results show that micro gears can be successfully fabricated under the injection pressure of 70 MPa and the 60% injection speed. Either too low or too high injection speed can cause incomplete filling of micro gears. The same is the case with too low injection pressure. Too high injection pressure can bring cracks. Solvent debinding of micro gears was performed in a mixture of petroleum ether and ethanol. Subsequently, micro gears were successfully debound by a multistep heating schedule.
关键词：
