# Low temperature synthesis of boron carbide using a polymer precursor powder route

Murray, Paul (2013). Low temperature synthesis of boron carbide using a polymer precursor powder route. University of Birmingham. M.Res.

 Preview
Murray13MRes_(2).pdf
PDF - Accepted Version

## Abstract

Boron carbide has a leading role in high performance applications due to its excellent mechanical properties. This work assesses the possibility of using polyvinylalcohol (PVA) and boric acid (H$$_3$$B0$$_3$$) to synthesise boron carbide powder (B$$_4$$C) with a small amount of free carbon. The process steps involve:
• Mixing PVA and H$$_3$$B0$$_3$$ in a dehydration condensation reaction to synthesise polyvinylborate (PVBO).
• PVBO is pyrolysed to carbonise the PVA and remove water from the boric acid to leave carbon and boron oxide.
• Pyrolysed sample is heat treated to synthesise boron carbide.

A combination ofFTIR, TGA, XRD, Raman Spectroscopy and SEM has been used to characterise the PVBO, pyrolysed product and final heat treated product. The optimum processing conditions found were to use a composition of 3.7 g PVA arid 1 g H$$_3$$B0$$_3$$, and to pyrolyse at 600$$^o$$ c for 2 hours at a heating rate of 10$$^o$$ c min-$$^1$$. The pyrolysed sample wassubsequently heat treated at 1400$$^o$$ c for 5 hours at a heating rate of 10$$^o$$ c min - $$^1$$. This produced (B$$_4$$C) powder with a small amount of residual carbon. The results offer a potential low temperature and low cost alternative to the commercially produced (B$$_4$$C).

Type of Work: Thesis (Masters by Research > M.Res.)
Award Type: Masters by Research > M.Res.
Supervisor(s):
Supervisor(s)EmailORCID
Chang, I. T. H.UNSPECIFIEDUNSPECIFIED
Licence:
College/Faculty: Colleges (2008 onwards) > College of Engineering & Physical Sciences
School or Department: School of Metallurgy and Materials
Funders: None/not applicable
Subjects: T Technology > TN Mining engineering. Metallurgy
URI: http://etheses.bham.ac.uk/id/eprint/3976

### Actions

 Request a Correction View Item