共查询到19条相似文献,搜索用时 140 毫秒
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玻璃溢流下拉法成型工艺中玻璃组分与溢流砖的匹配性至关重要。通过静态侵蚀实验和界面分析,研究不同组分锂铝硅玻璃对锆英石溢流砖的侵蚀性。实验结果表明:锂铝硅玻璃组成中氧化钠含量对锆英石溢流砖的侵蚀影响显著,氧化钠含量越高,锆英石分解温度越低;相同的玻璃组成,实验温度越高,玻璃对溢流砖的侵蚀越严重。 相似文献
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《高科技纤维与应用》2018,(6)
以玄武岩纤维生产炉窑顶部加料口上部的刚玉莫来石砖和侧壁内衬高铬砖作为研究对象,采用XRD、XRF、SEM和EDX等分析方法,研究了玄武岩熔体对炉窑耐火材料的侵蚀行为,结果表明炉窑顶部的刚玉莫来石砖以50 mm/a侵蚀速率被侵蚀,刚玉莫来石砖内部的刚玉和莫来石晶粒与玄武岩反应生成低熔点的钙长石、橄榄石、铁尖晶石等物质,同时受到挥发分气流的物理性冲刷,导致刚玉莫来石砖耐侵蚀性能差;而炉窑内侧壁高铬砖耐侵蚀性较好,腐蚀速率为2. 5 mm/a,高铬砖与熔体接触区以化学反应结合物理磨损侵蚀方式为主,同时,Fe元素在高铬砖侵蚀过程中起着固溶-传质的作用,加速炉衬材料侵蚀。 相似文献
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为深入了解玄武岩高温熔体对耐火材料的侵蚀行为,参照ASTM C621—1984(2001)分别对致密氧化铬砖、致密锆英石砖和熔铸锆刚玉砖(AZS-33)进行了1 500℃72 h的玄武岩熔液侵蚀试验,并对侵蚀后试样进行了显微结构对比分析。侵蚀试验结果表明,致密氧化铬砖的抗熔融玄武岩侵蚀性最好,其次是致密锆英石砖,最差的是熔铸AZS-33砖,其在液面线处出现严重剥落现象。显微结构分析表明:致密氧化铬砖结构均匀,与玄武岩熔液反应性小,同时与玄武岩渣中的成分形成尖晶石致密层阻止了渣的进一步渗透;致密锆英石砖表面与玄武岩熔液反应产生很薄的脱锆层和玻璃相,并且其致密均匀的结构也阻止了渣的进一步渗透;熔铸锆刚玉砖的显气孔率虽然很低,对玄武岩熔液有较好的抗渗透性,但其液相量较多,因此抗侵蚀性相对较差。 相似文献
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用静态浸泡法对电熔石英砖、天然白泡石、烧结纯刚玉砖、锆刚玉砖和锆英石砖五种耐火材料在玻璃液中的侵蚀情况进行了试验,从而确认刚玉砖适合于在耐辐照电绝缘玻璃纤维的生产中用作炉衬耐火材料. 相似文献
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The microstructure of high chrome bricks made at dif-ferent sintering temperature are analyzed by SEM. The re-sults indicate that the sintering temperature of high chromebricks has an optimum range, it is not the higher, the ber-ter. The high chrome. bricks made at this sintering temper-ature have the moderate crystal size in the matrix and ofdense structure. The closed bonding structure could be ob-tained between grains and matrix and no crackle occurred.The high chrome bricks with this microstructure have thebest dynamic properties. 相似文献
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通过对使用后的耐火砖残砖取样分析,了解高铬砖显微结构和成分变化,找出气化炉内不同高铬砖受熔渣侵蚀损毁的机理。结果表明:对于结构相同的耐火砖,熔渣成分、温度和耐火砖的内部致密程度及杂质含量是影响耐火砖渣蚀速率的主要因素。 相似文献
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水煤浆加压气化炉用高铬耐火材料的显微结构及损毁机理 总被引:3,自引:0,他引:3
采用扫描电镜和能谱分析方法 ,分析了水煤浆加压气化炉用高铬砖渣蚀前后的显微结构和相组成 ,探讨了主要损毁机理。结果表明 :煤熔渣与砖反应和渗透引起砖组成的改变 ,从而导致砖的结构剥落和强度弱化是砖损毁的主要原因 ;LIRR -HK90砖的显微结构呈网络状镶嵌结构 ,直接结合程度高 ,与渣反应可生成 (Mg ,Fe) (Al,Cr,Fe) 2 O4 复合尖晶石致密带 ,阻止了渣的进一步渗透 ,减缓渣蚀速度和结构剥落 ,其使用效果优于进口的同类产品 相似文献
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Nejat Y. Sari 《Polymer Composites》2009,30(10):1442-1449
The influence of erodent particle types on solid particle erosion of randomly oriented short glass fiber and mineral particle reinforced polyphenylene sulphide (PPS) was investigated. The solid particle erosion studies were carried out using low speed solid particle erosion test rig with 150 to 212‐μm brown fused aluminum oxide (Al2O3), 150 to 200‐μm silica sand and 150 to 250‐μm glass bead. Glass bead eroding particles appear spherical in shape whereas aluminum oxide and silica sand eroding particles have sharp and angular edges. The erosion tests were conducted at six different contact angles of 15, 30, 45, 60, 75, and 90°, respectively. The results showed a strong dependence of the eroding particle types on the erosive wear behavior of PPS composite. The peak erosion rate occurred at 45° contact angle for silica sand eroding particles while the peak erosion rate occurred at 30° contact angle for aluminum oxide and glass bead particles. The morphologies of eroded surfaces were characterized by the scanning electron microscopy. In case of aluminum oxide and silica sand, the erosive wear mechanism occurs firstly by the erosion of matrix, followed by the fracture of un‐supported fibers and their detachment; however, the erosive wear mechanism occurs different for glass bead particles. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers 相似文献
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《中国耐火材料》2020,(2)
Aiming at prolonging the service life of refractories for direct reduction of laterite nickel ores in rotary kilns, the slag resistance of ten materials(corundum bricks, chrome corundum bricks, silicon nitride bonded silicon carbide bricks, high alumina silicon carbide bricks, high alumina bricks, magnesia chrome bricks, magnesium aluminate spinel bricks, spinel chrome corundum bricks, chrome corundum castables and magnesia alumina chrome composite spinel bricks) was evaluated by rotary slag tests, which simulate the service conditions in rotary kilns. The corroded residual bricks were analyzed by SEM and EDS. The results show that the magnesia alumina chrome composite spinel brick possesses the advantages of magnesium aluminate spinel bricks and chrome corundum bricks; MgO-rich spinel can absorb the penetrated ferric oxide, and forms a dense zeylanite layer, which prevents the penetration of the molten laterite nickel ores; therefore, it is an ideal lining of rotary kilns for direct reduction of laterite nickel ores. 相似文献
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对使用后的耐火砖残砖进行取样分析,以了解高铬砖显微结构和成分变化,找出水煤浆气化炉向火面高铬砖受熔渣侵蚀损毁的机理。结果表明:对于结构相同的耐火砖,在高温熔渣侵蚀耐火砖的过程中,主要影响因素是熔渣的成分、工作温度、耐火砖的致密度和杂质含量,熔渣中的SiO2含量是造成渣蚀的直接原因,而耐火砖的工作温度、致密度和杂质含量决定了渣蚀的速率。 相似文献
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《中国耐火材料》2012,(2)
The magnesia composite materials were prepared using fused magnesia,used magnesia chrome bricks, magnesium aluminate spinel, alumina powder and chrome oxide powder as starting materials. In order to improve the performance of magnesia composite material,the influence of chrome oxide concentrate powder on the properties of magnesia composite material was researched. The apparent porosity,bulk density,cold crushing strength,linear expansion and thermal shock resistance of the specimens were determined. The results show that adding chrome oxide concentrate promotes the formation of the composite phases of three kinds of spinel,which is beneficial to the thermal shock resistance. The magnesia chrome spinel can not be formed at high temperatures theoretically,but can dissolve in the magnesia composite material. Comprehensively,the optimal addition of chrome oxide concentrate is 10. 0 mass% for the magnesia composite materials. 相似文献