耐火材料
耐火材料
내화재료
REFRACTORIES
2014年
3期
170-173
,共4页
镁碳砖%热处理温度%显微结构%抗折强度%抗热震性%还原气氛
鎂碳磚%熱處理溫度%顯微結構%抗摺彊度%抗熱震性%還原氣氛
미탄전%열처리온도%현미결구%항절강도%항열진성%환원기분
magnesia carbon brick%heat treatment temperature%microstructure%modulus of rupture%thermal shock resistance%reduction atmosphere
按电熔镁砂、天然鳞片石墨、沥青、Al粉、Si 粉的质量分数分别为85.5%、8%、0.5%、4%、2%,外加质量分数4%热固性酚醛树脂为结合剂进行配料,经搅拌均匀后成型,分别在1000、1200和1400℃保温3 h埋焦炭还原气氛下热处理,研究了热处理温度对试样物相组成、显微结构及强度的影响。结果表明:热处理温度为1000℃时,试样中有长条状Al4 C3和呈八面体状的MgAl2 O4生成;1200℃热处理后试样中有纤维状Al4 C3、呈八面体状的MgAl2 O4及呈片层板状的SiC生成;1400℃热处理后试样中有针状AlN、纤维状Al4 C3、呈八面体状的MgAl2 O4及大量的SiC晶须生成,形成了良好的非氧化物结合,使试样具有更高的抗折强度和优异的抗热震性能。
按電鎔鎂砂、天然鱗片石墨、瀝青、Al粉、Si 粉的質量分數分彆為85.5%、8%、0.5%、4%、2%,外加質量分數4%熱固性酚醛樹脂為結閤劑進行配料,經攪拌均勻後成型,分彆在1000、1200和1400℃保溫3 h埋焦炭還原氣氛下熱處理,研究瞭熱處理溫度對試樣物相組成、顯微結構及彊度的影響。結果錶明:熱處理溫度為1000℃時,試樣中有長條狀Al4 C3和呈八麵體狀的MgAl2 O4生成;1200℃熱處理後試樣中有纖維狀Al4 C3、呈八麵體狀的MgAl2 O4及呈片層闆狀的SiC生成;1400℃熱處理後試樣中有針狀AlN、纖維狀Al4 C3、呈八麵體狀的MgAl2 O4及大量的SiC晶鬚生成,形成瞭良好的非氧化物結閤,使試樣具有更高的抗摺彊度和優異的抗熱震性能。
안전용미사、천연린편석묵、력청、Al분、Si 분적질량분수분별위85.5%、8%、0.5%、4%、2%,외가질량분수4%열고성분철수지위결합제진행배료,경교반균균후성형,분별재1000、1200화1400℃보온3 h매초탄환원기분하열처리,연구료열처리온도대시양물상조성、현미결구급강도적영향。결과표명:열처리온도위1000℃시,시양중유장조상Al4 C3화정팔면체상적MgAl2 O4생성;1200℃열처리후시양중유섬유상Al4 C3、정팔면체상적MgAl2 O4급정편층판상적SiC생성;1400℃열처리후시양중유침상AlN、섬유상Al4 C3、정팔면체상적MgAl2 O4급대량적SiC정수생성,형성료량호적비양화물결합,사시양구유경고적항절강도화우이적항열진성능。
MgO-C refractory specimens were prepared using 85.5%(in mass,the same hereinafter)fused magnesia,8% natural flake graphite,0.5% pitch,4% metallic Al powder,2% Si powder,extra adding 4%phenolic resin as binder,batching,stirring,shaping,and carbon embedded firing at 1 000 ℃,1 200 ℃, 1 400 ℃ for 3 h,respectively.The influence of heat treatment temperature on phase compositions,micro-structure and mechanical strength of the MgO-C specimens were studied.The results show that:after heat treatment at 1 000 ℃,strip-like Al4C3 and octahedral MgAl2O4 form;after heat treatment at 1 200 ℃,fibrous Al4C3,octahedral MgAl2O4,and plate-like SiC form;after heat treatment at 1 400 ℃,needle-like AlN,fibrous Al4C3,octahedral MgAl2O4 and a large amount of SiC whiskers form,forming good non-oxides bonding, thus endowing the specimens with high MOR and good thermal shock resistance.