کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1603240 | 1515977 | 2014 | 6 صفحه PDF | دانلود رایگان |
• Sodium alginate, a natural innoxious polymer, was employed for gel-casting process.
• The gel was loaded by high density tungsten carbide powder.
• Drying the slurry led to microporous foam with 50–60% porosity.
• The dried green bodies exhibit homogenous pore distribution.
• Pre-sintered bodies show microporous foams with average pore size of 0.75 μm.
In this study, nontoxic sodium alginate was utilized in gel-casting process to fabricate tungsten carbide (WC) micro-porous foam. Suspensions containing 20 and 25 vol.% WC and 1 wt.% sodium alginate were used. Calcium phosphate and sodium hexa-metaphoshphate were employed as solidifier agent and chelator, respectively. The green bodies were dried at room temperature for 36 h and pre-sintered at 1450 °C for 4 h. The influence of chelator and calcium salt on strength of dried green body was evaluated. Tungsten carbide foams with 50–60% porosity were successfully produced. SEM micrographs of tungsten carbide foams show a uniform porous microstructure, with average size of 0.75 μm.
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Journal: International Journal of Refractory Metals and Hard Materials - Volume 43, March 2014, Pages 115–120