| Summary: | 碩士 === 大同大學 === 材料工程學系(所) === 94 === The purpose of this research is to fabricate porous silicon carbide
from bamboo , and then to infiltrate 2024 aluminum alloy and copper to
form ceramic / metal composites . The bamboo was first transformed into
porous charcoal by carbonization in argon atmosphere . Proper proportion
of Si was then reacted with porous charcoal to form porous SiC ceramic .
Finally , under high temperature and inert atmosphere, melting metal
( Al-alloy and Cu ) were infiltrated into porous SiC by capillary force .
In the case of infiltrating Al alloy for 4 hr , Al alloy was found inside
the sample only when infiltrating temperatures were ≧900℃ . However ,
Al4C3 was formed if temperatures was 1050℃ . So 900℃ appeared to be
a suitable temperature to infiltrate Al alloy . The amount of infiltrated
Al-alloy increased as infiltration time increased . After infiltration at
900℃ for 8 hr , the bulk density of the sample reached 2.0 g/cm3 , and the
open porosity was 13% . The average of micro-hardness reached 87.3
kg / mm2 .
In the case of infiltrating Cu for 4hr , significant amount of Cu was
infiltrated in the sample at 1100℃ . The amount of infiltrated Cu
increased as infiltration time increased . After infiltration at 1300℃ for 4
hr , the bulk density of the sample reached 4.9 g/cm3 , and the open
porosity was 2% . The average of micro-hardness reached 114.5
kg / mm2 . After infiltration at 1300℃ for 4 hr , the compression strength
of the sample greatly increase due to the load bearing of Cu .
|
|---|
