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The scanning electron microscopy (SEM) diagrams of cross-sections of WSPC parts and after-treatment parts with different ingredient proportions: (a) WSPC parts (22% walnut shell powder); (b) WSPC parts (40% walnut shell powder); (c) WSPC wax-permeated parts (22% walnut shell powder); (d) WSPC wax-permeated parts (40% walnut shell powder); (e) WSPC resin-permeated parts (22%walnut shell powder); and (f) WSPC resin-permeated parts (40% walnut shell powder).
