成型压力对原位生成氮化物结合MgO-C材料的性能影响

来源 :第十八届全国高技术陶瓷学术年会 | 被引量 : 0次 | 上传用户:wri666
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
以电熔镁砂、金属硅粉和鳞片石墨为主要原料,木质磺酸钙溶液为结合剂,高温原位氮化制备氮化物结合MgO-C材料.主要研究了成型压力对氮化物结合MgO-C材料物相组成、氮化物显微形貌以及材料物理性能的影响.XRD测试获得的物相组成结果表明,高温氮化后不同压力下成型的试样内部原位氮化主要生成α-Si3N4、β-Si3N4以及少量的SiC,500MPa压力下还生成少量MgSiN2物相.SEM分析结果显示,原位生成的α-Si3N4和MgSiN2晶体均呈现颗粒状形貌,β-Si3N4晶体呈现圆柱状形貌.随着成型压力从200MPa增加到400MPa,β-Si3N4晶体尺寸不断增加;当成型压力增加到500MPa,由于MgSiN2的生成,抑制了3-Si3N4晶体的生长,β-Si3N4晶体尺寸下降.β-Si3N4晶体尺寸对材料物理性能影响较大,晶体尺寸越大,材料强度越高.当成型压力为400MPa时,原位生成的氮化物结合MgO-C材料强度最高.
其他文献
This study was designed to investigate the effect of grape pomace powder,monensin and mangosteen peel powder on feed intake,nutrient digestibility and rumen fermentation characteristic in dairy steers
Chicken egg yolk immunoglobulin,referred to as immunoglobulin Y (IgY) presents a promising alternative to antibiotics for passive immunization trials against intestinal infections.IgY has been shown t
Ensiling is a moist forage preservation method based on natural lactic acid fermentation,wherein lactic acid bacteria (LAB) anaerobically convert water-soluble carbohydrates into organic acids,which d
Pakistan is the worlds fourth largest milk producer yielding 46.44 billion liters of milk annually.The current situation of Pakistans dairy industry is becoming worse day by day due to the presence of
This experiment was conducted to evaluate the effect of creep feeding duration on sow and piglet based on growth,feed consumption and gut development.A total of 40 multiparous sows and their litters w
The effects of supplementation of different selenium (Se) sources on Se content,antioxidant capacity,lipid peroxidation,thyroid hormones,and mRNA expressions of hepatic glutathione peroxidase 4 (GPX-
The objective of this study was to determine the effect of using two types of rations (whole crop barley mixed with Italian ryegrass silage versus tall fescue hay) which had different forage:concentra
制备了不同含量Ce改性的La2Zr2O7粉末,采用化学成分分析、扫描电镜、X射线衍射、透射电镜等方法测试了粉末成分、相结构、纳米晶粒度、高分辨相、晶格常数等.采用热膨胀系数测试仪测试了粉末压成条状后的热膨胀系数,测试了材料的高温热导率.对粉末进行不同温度的热处理,研究了粉末的高温相结构稳定性.结果表明:随着Ce含量的增加,铈锆酸镧稳定的相结构由烧绿石转变为萤石结构,品格常数增加.随着Ce的添加,热
会议
以电熔白刚玉、金属硅粉和石墨为主要原料,在氮气气氛下1550℃保温4h制备原位反应的Sialon结合氧化铝-碳材料,采用静态坩埚法研究精炼钢渣对该Sialon结合氧化铝-碳材料的侵蚀反应机理.试样在1500℃、1550℃和1600℃下分别保温1h、2h、3h时,进行渣侵蚀实验,采用SEM和EDS对渣侵蚀后试样的显微结构和微区成分分别进行分析,获得了Sialon结合氧化铝-碳材料的渣侵蚀机理.结果表
会议
以粒度3-1mm、1-0mm和≤0.088mm的高铝矾土为主要原料,不同配比的硼酸和氧化硼为复合结合剂,手工捣打成型.将成型、烘干后的试样分别在1400℃和1500℃下保温3h烧成,测量烧后试样的线变化率、显气孔率、体积密度和耐压强度,并采用XRD分析试样的物相组成,SEM观察试样的显微结构.
会议