Rapid carbonization process of graphite parts formed by micro-thermocompression moulding
In order to address the problem of cracking in graphite parts during carbonization,based on the principle of multi material assembly technology,a method was proposed to construct an ablative two-dimensional organic network during the micro-thermocompression moulding process of graphite powder to form an exhaust channel and avoid cracking.The influence of carbonization rate,radial size of graphite parts,as well as the structure and distribution mode of the network on the forming quality and mechanical properties of the graphite parts was studied.The results show that a faster carbonization rate will intensify the pyrolysis of organic matter,resulting in more obvious cracking phenomenon,and the graphite parts with larger radial sizes present the greater gas escape resistance.Increasing the density of organic matter networks can help improve exhaust efficiency,but it has a negative effect on the mechanical properties of the graphite parts.In the arrangement of the organic network along the forming height direction,there are no cracks in the graphite parts when the spacing is 10 mm.The graphite parts prepared by the optimized process have a complete structure,and after impregnation reinforcement,its compressive strength reaches 15.8 MPa,and the Z-axis thermal conductivity is only 1.894 W/(m·K).Its comprehensive performance is comparable to that of water-glass sands,showing a wide range of application prospects in the casting industry.
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