Effect of minor alloying additions on the sintering of Ti-2.5Cu alloy

Chin, KwanYew (2010). Effect of minor alloying additions on the sintering of Ti-2.5Cu alloy Honours Thesis, School of Engineering, The University of Queensland.

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Author Chin, KwanYew
Thesis Title Effect of minor alloying additions on the sintering of Ti-2.5Cu alloy
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2010
Thesis type Honours Thesis
Supervisor Ma Qian
Yang Fa Yen
Total pages 80
Language eng
Subjects 0913 Mechanical Engineering
Formatted abstract
Potential applications of Ti-Cu alloys in the medical and dental industry encourage present  research work in developing a more reliable and economical manufacturing process. One of the many ways is to  implement the powder metallurgy manufacturing technique, particularly the conventional press and  sintered process, so as to create a near net shape fabrication technique not requiring additional  post processing. Ti-2.5Cu has great weldability and machinability on top of the advantages of  retaining Titanium mechanical strength. However, generally PM (Powder Metallurgy) processed IMI230  components could not meet the industry standard of having at least 97% of its theoretical density.  Resolving this issue essentially defines the main work of this project.

Among all the powder metallurgy processes, the cold-press-and-sintered approach was selected and  investigated in this project, using addition of Silicon and Boron as the aiding agents. In the  initial experiment, a repeated process of looking for ideal volume percentage was performed on 3  selected aiding agents namely, Silicon, Iron, and Boron with IMI230. All were processed under 1300 ⁰C of 2 hours isothermal vacuum sintering and pre-compaction pressure of 400MPa, which later filtered the  candidates to only Silicon and Boron due to insignificant results from Iron addition. Samples were  prepared, density at different stages was calculated, ready to be analysed. Results show that under  these circumstances, both Silicon and Boron were able to produce samples that have relative density  greater than 95%, compare with pure IMI230 of 93.5% average value. This narrowed the direction of  next stage experiments required. By switching the sintering temperature between 1250, 1300, and 1350⁰C; Boron and Silicon content have been varied to observe the best ratio of the improvement capability. Results revealed that  0.3% of Boron and 1.0% Silicon both could increase relative sintered density to 96%  and 96.5% respectively in the maximum temperature of 1350⁰C. In the following experiments, samples which consist of 0.3B-1.0Si and 0.5B-1.0Si within IMI 230 were prepared and underwent identical sintering processes based on the idea of combining the best ratio of both aiding agents.
Keyword Minor Alloying Additions

Document type: Thesis
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