School;
of;
Materials;
Science;
and;
Engineering,;
Lanzhou;
University;
of;
Technology,;
Lanzhou;
730050,;
China;
School;
of;
Materials;
Science;
and;
Engineering,;
Lanzhou;
University;
of;
Technology,;
Lanzhou;
730050,;
China;
School;
of;
Materials;
Science;
and;
Engineering,;
Lanzhou;
University;
of;
Technology,;
Lanzhou;
730050,;
China;
School;
of;
Materials;
Science;
and;
Engineering,;
Lanzhou;
University;
of;
Technology,;
Lanzhou;
730050,;
China;
graphite; particle; vacuum; infiltration; casting; surface; composite; preform;