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Abstract
Thermal debinding of injection moulded SiC parts is usually performed in an inert atmosphere or vacuum, which increases the production cycle and costs. The present study examines the thermal debinding of SiC green parts in air atmosphere. No obvious defects were found for debound parts under 500°C. Binders were easier to remove in air because of the continuous oxygen supply. Subsequent pre‐sintering was performed at different temperatures (550, 650, 750, 850, 950°C). Cracking was only found in samples pre‐sintered at 950°C, which is a result of the volume expansion induced by oxidation. The oxidation decreases the pores and enhances the contact area of SiC powders. Sufficient strength for transport could be obtained by pre‐sintering samples in air atmosphere at low temperature. So, thermal debinding in air atmosphere at a suitable temperature could reduce the requirement of debinding for heating equipment, decrease production costs and increase the efficiency of debinding for SiC parts.
Financial support from the ‘Fundamental Research Funds for the Central Universities’ (Grant No. HIT.NSRIF.2009034)’, ‘Opening Funding of Key Laboratory of Micro‐system and Micro‐structures Manufacturing (Harbin Institute of Technology), Ministry of Education (HIT..KLOF.2009004)’ and ‘Opening Funding of State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology’ is gratefully acknowledged.