为了改善以木炭为造孔剂的多孔莫来石陶瓷的性能，以烧结莫来石（0．25～0．3 mm）、SiO2微粉、Al2 O3微粉、滑石粉、球黏土、膨润土、甲基纤维素、木炭粉（≤0．044 mm）为原料，研究了不同量的木炭粉（外加质量分数分别为0、2％、4％、6％、8％、10％、12％）对多孔莫来石坯体的成型外观、烘干后的常温耐压强度及1400℃保温3h热处理后的显气孔率和常温耐压强度的影响，并对不同木炭添加量的多孔莫来石试样进行了显微结构分析。结果表明：外加质量分数≤8％的木炭，制成的多孔莫来石坯体可较好成型；外加质量分数2％～8％木炭的莫来石坯体与不添加木炭的相比，烘干后试样的常温耐压强度明显提高；多孔莫来石热处理后的显气孔率随着木炭添加量的增加而增加，常温耐压强度随之降低。综合考虑多孔莫来石陶瓷各项性能，木炭外加质量分数不宜超过8％。
Sintered mullite(0.25 -0.3 mm),SiO2 micropowder,Al2 O3 micropowder,talc powder,ball clay, amargosite,methylcellulose and charcoal powder(≤0.044 mm)were used as main starting materials to im-prove the properties of porous mullite ceramics with charcoal powder as the pore former.The influences of charcoal powder addition (extra-added 0,2%,4%,6%,8%,10%and 12%,respectively,in mass,the same hereinafter)on moldability of green bodies,CCS of dried specimens,CCS and AP of specimens treated at 1 400 ℃for 3 h were studied,and the microstructure of porous mullite specimens was analyzed.The results show that:the mullite green bodies with ≤8% charcoal powder has good moldability;compared with the specimens without charcoal powder,CCS of the dried specimens with 2%-8%charcoal powder improves obviously;with the charcoal powder increasing,the AP of the heat-treated specimens increases and CCS decreases.Thus,the appropriate charcoal addition in porous mullite ceramics shall not be more than 8%.
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