以ω(Al_2O_3)＞99.1%的电熔致密刚玉,粒度＜0.074 mm、ω(SiC)＞97%的碳化硅等为主要原料,SiO_2微粉、沥青和Alphabond为添加物,研究了纳米SiC加入量(质量分数,下同)分别为0, 0.5%, 1%, 1.5%和2%时对Alpha-bond结合的Al_2O_3-SiC-C质浇注料的流动值、常规物理性能、高温抗折强度和抗渣性的影响.采用XRD衍射仪和SEM对实验后的试样进行了物相和显微结构分析.结果表明:采用细粉预混法引入纳米SiC,使Al_2O_3-SiC-C质浇注料更为致密;在保持浇注料流动性相当的条件下,纳米SiC加入量增加到2%,浇注料加水量从3.83%增加到4.67%,增幅为22%,说明纳米SiC的引入对浇注料的流动性影响较大;纳米SiC的加入,对浇注料的常温抗折强度和耐压强度影响不大,高温抗折强度在纳米SiC加入量为0.5%时最高,提高幅度为4%;物相分析表明,添加1.0%纳米SiC后的试样中生成的莫来石比不加纳米SiC试样中生成的少,刚玉的量跟不加纳米SiC试样中的相当,SiC的量比不加纳米SiC试样中剩余的多;静态坩埚抗渣实验表明,含纳米SiC的浇注料,在加入1.0%纳米Al_2O_3时,抗渣渗透性得到显著改善,而抗渣侵蚀性变化不明显.
Using dense fused alumina and SiC as main Starting materials, nano SiC, pitch ball and Alphabond as additives, effects of nano SiC addition of 0, 0.5%, 1%, 1.5% and 2% on the flowability, physical properties hot modulus of rupture (MOR) and slay resistance were investigated for the Al pha-bond Al_2O_3-SiC-C castables. Phases and microstructure of samples after experiments were analyzed by XRD and SEM. Results show that introduction of nano SiC to the castables by premixing with fines makes the castables denser; under the certain condition of flow ability, content of nano SiC addition increases to 2%, the water addition increases from 3.83% to 4.67%, by 22%, indicating that introduction of nano SiC has great effect on the flow ability, while it does not influence the cold MOR and hot MOR obviously, and hot MOR is the highest with 0.5% nano SiC addition, increased by 4%, phase composition analysis shows that the mullite form 1.0% nano SiC addition, while SiC residual content is more that that of samples without nano-SiC. Static crubcible slay resistance tests show for the nano-SiC castables with 1.0% nano Al_2O_3, the slag resistance penetration is improved significantly, but slag resistance corrosion changes lightly.
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