溶胶－凝胶法制备莫来石晶须

用正硅酸乙酯、硝酸铝为原料，采用溶胶－凝胶工艺制备了Ａｌ＿２Ｏ＿３－ＳｉＯ＿２干凝胶，通过高温热处理制得了直径为０．５～２．５μｍ，长径比为５～４０的莫来石晶须。采用ＸＲＤ，ＳＥＭ，ＴＥＭ和ＳＡＤＰ等手段研究了莫来石晶须的晶相组成、形貌与生长方向，发现莫来石晶须是沿其ｃ轴方向生长的。用４ｍｏｌ／ＬＮＨ＿３·Ｈ＿２Ｏ催化的Ａｌ＿２Ｏ＿３－ＳｉＯ＿２溶胶的凝胶化时间越短，经高温热处理后莫来石晶须含量越高。     

溶胶—凝胶法制备莫来石晶须

用正硅酸乙酯，硝酸铝为原料，采用溶胶－凝胶工艺制备了Ａｌ２Ｏ３－ＳｉＯ２干凝胶，通过高温热处理制得了直径为０．５－２．５μｍ，长径比为５－４０的莫来石晶须。采用ＸＲＤ，ＳＥＭ，ＴＥＭ和ＳＡＤＰ等手段研究了莫来石晶须的晶相组成，形貌与生长方向，发现莫来石晶须是沿其ｃ轴方向生长的。     

SiCw／涂层／TZP陶瓷复合材料界面化学键的XPS和IR研究

本文用ＸＰＳ和ＩＲ测定了ＳｉＣｗ／（Ａｌ２Ｏ３，莫来石）涂层／ＴＺＰ陶瓷复合材料的界面化学键。结果表明ＳｉＣｗ／Ａｌ２Ｏ３、莫来石、ＴＺＰ界面为化学结合而Ａｌ２Ｏ３、莫来石／ＴＺＰ界面为物理结合。     

新型复相陶瓷刀具材料Jx-2-I协同增韧补强机理的研究

本文研制成功的新型陶瓷刀具材料—ＳｉＣ晶须（ＳｉＣｗ）增韧和ＳｉＣ颗粒弥散增韧Ａｌ２Ｏ３陶瓷刀具Ｊｘ－２－Ｉ,该刀具材料具有高的抗弯强度和断裂韧性等优点;对比Ａ（Ａｌ２Ｏ３）、ＡＰ（Ａｌ２Ｏ３／ＳｉＣｐ）、ＡＷ（Ａｌ２Ｏ３／ＳｉＣｗ）、Ｊｘ－１（Ａｌ２Ｏ３／ＳｉＣｗ）和Ｊｘ－２－１（Ａｌ２Ｏ３／ＳｉＣｐ／ＳｉＣｗ）等陶瓷材料的力学性能可以看出,在Ｊｘ－２－Ｉ材料中具有明显的增韧补强叠加效应;本文在热失配分析和微观结构观察的基础上详细研究了Ｊｘ－２－Ｉ刀具材料的增韧补强机理,系统研究了Ｊｘ－２－Ｉ中各种增韧补强机理之间的协同效应。     

SiCw在Al2O3—C复合耐火材料中的原位生长

通过引入金属Ｓｉ和活性Ｃ对ＳｉＣ晶须在Ａｌ２Ｏ３－Ｃ复合耐火材料中的原位生长进行了实验研究,利用ＳＥＭ结合电子探针（ＥＰＭＡ）研究了ＳｉＣｗ在Ａｌ２Ｏ３－Ｃ复合耐火材料中的原位生长机理,提出了液－固生长机理,并讨论了其热力学和动力学条件．     

SiC—Al2O3基复相陶瓷的N2—HIP研究

通过对热压ＳｉＣ－Ａｌ２Ｏ３复合材料进行了Ｎ２－ＨＩＰ后处理，制备得到Ｓｉ３Ｎ４－ＡｌＮ＝ＳｉＣ－Ａｌ２Ｏ３梯度材料，经Ｎ２－ＨＩＰ处理后，材料抗弯强度提高３５％－９５％，并得到经强度达１０３０ＭＰａ的ＳｉｅＮ４－ＡｌＮ／ＳｉＣｐ－ＳｉＣＷ－Ａｌ２Ｏ３复合材料。     

Si－C－O－N系统相稳定性及反应烧结制备原位SiC（p）复合ZAS材料

给制了Ｓｉ－Ｃ－Ｏ－Ｎ系统平衡状态下相稳定性与Ｎ２分压和Ｏ２分压以及相稳定性与Ｎ２分压和ＳｉＯ分压的关系图；以此为指导，将原位复合引入到反应烧结锆莫来石（ＺＡＳ）材料中，制备了含原位（ｉｎ－ｓｉｔｕ）ＳｉＣ（ｐ）的ＺｒＯ２ＳｉＣ（ｐ）、ＺｒＯ２－３Ａｌ２Ｏ３·ＺＳｉＯ２－ＳｉＣ（ｐ）－ＳｉＣ（ｐ）复合材料。研究了烧结温度、时间、碳添加量、成型压力等工艺因素对烧结ＺｒＳｉＯ４－Ｃ体系中原位ＳｉＣ生成量的影响，并观察了试样的显微结构。     

陶瓷基纤维复合材料制备新工艺—化学气相渗积

本文简要介绍了化学气相渗积新工艺及几种典型装置的特点，列举了ｆＳｉＣ／Ｓｉ３Ｎ４、ｆＡｌ２Ｏ３／Ａｌ２Ｏ３、ｆＡｌ２Ｏ３／ＭｏＳｉ２等六种陶瓷基纤维复合材料的制备实例。     

Na2O—Al2O3—B2O3—SiO2系统溶胶,凝胶涂层的振动光谱研究

本文用振动光谱分析了Ｎａ２Ｏ－Ａｌ２Ｏ３－Ｂ２Ｏ３－ＳｉＯ２系统溶胶中的化学反应和用浸渍法制备的凝胶涂层结构。结果表明：部分硼、铝在溶胶陈化初期就与Ｓｉ（ＯＣ２Ｈ５）４的水解或缩聚产物反应形成线性聚合物，宜于浸涂。热处理时涂层中继续形成Ｓｉ－Ｏ－Ｓｉ、Ｓｉ－Ｏ－Ａｌ和Ｓｉ－Ｏ－Ｂ键；基本结构单元为［ＳｉＯ４］、［ＢＯ４］、［ＢＯ３］和［ＡｌＯ４］。     

新型复相陶瓷刀具材料JX—2—Ⅰ协同增韧补强机理的研究

本文研制成功了一种新型陶瓷刀具材料－ＳｉＣ晶须增韧和ＳｉＣ颗粒弥散增韧Ａｌ２Ｏ３陶瓷刀具ＪＸ－２－Ⅰ，     

自生晶须强韧化莫来石材料的研究

采用溶胶－凝胶法制备Al2O3-SiO粉料，并通过二步加热处理工艺制备自生晶须莫来石材料。研究结果表明，凝胶胶化时间、干凝胶预烧温度和粉料粒度以及生坯密度对自生晶须有重要影响，自生晶须对莫来石材料有明显的强韧化作用。     

Al2O3-SiO2体系制备莫来石纤维的研究

本文主要研究了在Al2O3-SiO2体系中,加入MgO、B2O3等组分,采用熔融拉丝工艺制备出了莫来石纤维。通过XRD、DTA、SEM等测试方法对莫来石纤维的微观结构及其组成进行了研究,结果表明：制备得到的纤维主晶相为莫来石,其组织形态为针状或棒状,具有优良的耐腐蚀性和耐火性。     

镁质强化瓷的研制

本工作以MgO-Al2O3-SiO2和K2O－Al2O3-SiO2三元系统相图为理论依据，较深入系统地研究了滑石等主要原料、工艺条件对提高瓷胎机械强度的影响，确定了工艺、性能理想的坯料和与之相匹配的高强度釉的配方组成。研制的镁质强化瓷产品规整，瓷质细腻，色调柔和，各项性能指标均达到当前国际上流行的同类产品水平。研究认为：胎体中较多的原顽火辉石和少量的堇青石弥散在较少的玻璃相中，及较多交织成网的针状莫来石和极少的气孔是镁质强化瓷强度高的主要原因。     

Industrial waste silica-alumina gel recycling: Low-temperature synthesis of mullite whiskers for mass production

The increasing demand for mullite whisker-reinforced, toughened ceramic materials and mullite raw materials that meet industrial requirements has prompted the search for new and alternative sources, as well as effective technologies to obtain the target products. In this work, mullite whiskers of high purity were synthesized by a vapor-liquid–solid (V-L-S) process using industrial waste silica-alumina gel and Al₂(SO₄)₃·18H₂O as raw materials, with AlF₃·3H₂O and Na₂SO₄ as additives. The effects of sintering temperatures on the mullitization reactions and mullite morphology were investigated by XRD, TG-DTA, SEM and so forth. The results suggest that the introduction of AlF₃·3H₂O and Na₂SO₄ alters the mullitization reaction path, which leads to an initial mullitization reaction temperature of 720 °C. The SEM results demonstrate that mullite whiskers transformed from secondary growth to anisotropic growth when the sintering temperature was increased from 720 °C to 825 °C. By analyzing the experimental results, the mechanism of AlF₃·3H₂O-assisted growth of mullite whiskers with Na₂SO₄ as the liquid phase template is proposed based on the “dissolution-precipitation” process. Herein, a novel and feasible solution for the recycling of silica-rich industrial waste is proposed, which offers new and simple insights into the high value-added recycling of industrial waste, which provides new ideas for the actual mass production of mullite whiskers.     

莫来石结合Al2O3-SiC浇注料的显微结构特征

借助SEM和EDAX研究了莫来石结合Al2O3 -SiC浇注料的显微结构特征。结果表明 :在莫来石结合Al2 O3 -SiC浇注料中 ,莫来石相与填充在其间隙的玻璃相形成连续基质 ;刚玉颗粒与基质中SiO2 反应生成的二次莫来石与基质中的原生莫来石交错存在 ,构成网状结构 ;SiC颗粒表面高温氧化生成的SiO2 膜 ,改善了SiC颗粒与基质的润湿性 ,是其与基质直接结合的媒介。     

Preparation of self-reinforcement of porous mullite ceramics through in situ synthesis of mullite whisker in flyash body

Self-reinforced porous mullite ceramics were fabricated by a starch consolidation method with flyash, different aluminium sources (Al(OH)₃ and Al₂O₃) and the additive AlF₃ as raw materials. The reinforcement mechanism of needle-like mullite whiskers through in situ synthesis in ceramic body was investigated. The bulk density, apparent porosity and bending strength of the samples were tested. Phase compositions and microstructures of the sintered samples were measured by XRD and SEM, respectively. It showed that AlF₃ as additive was helpful to the formation of mullite whiskers at a low temperature. As the aluminium sources, Al(OH)₃ was more suitable for the preparation of mullite whiskers than Al₂O₃. The in situ synthesized mullite whiskers formed an interlocking structure, which enhanced the mechanical strength of the porous mullite ceramics. Porous mullite ceramics with bending strength of about 100 MPa and apparent porosity of about 55% were made at 1550 °C.     

粉煤灰合成莫来石晶须过程中的相变特征

采用循环流化床(CFB)高铝粉煤灰和煤粉炉(OF)高铝粉煤灰为原料,以AlF_3·3H_2O为导向剂,V_2O_5为催化剂,通过固相反应制备莫来石晶须。利用XRD和SEM等手段,分析了产物的物相,对产物的形貌进行了表征。探讨了原料结晶程度、合成温度及保温时间、导向剂含量等工艺条件对产物的影响,优选出合理的制备工艺参数,分析了莫来石晶须的合成反应机制。     

金属基表面Al2O3-SiO2涂层耐腐蚀性能的研究

由溶胶完全混合后再制备的Al2O3-SiO2复合涂层在碱性、酸性介质中都表现出更好的耐腐蚀性.     

Al2O3对ZTM陶瓷结构与性能的影响

本文研究了氧化铝对ZTM陶瓷结构和性能的影响.发现在烧结过程中,氧化铝可固溶于莫来石颗粒形成富铝型柱状莫来石,产生的体积膨胀增强了基质对氧化锆颗粒的约束,使材料中的四方氧化锆相对含量增加,其强韧化效果进一步发挥,明显改善了材料的力学性能.     

Intermediate Phases in Mullite Synthesis Via Aluminum- and Alumina-Filled Polymethylsiloxane

Active filler pyrolysis of polymethylsiloxane/aluminum (PMS/Al) mixtures leads to the formation of mullite at 1400°C, and by 1700°C mullite is the only crystalline phase in an amorphous matrix. These mixtures show a complex series of oxidation and reduction reactions prior to the formation of mullite. Initial oxidation of PMS at low temperatures results in the formation of an amorphous product before any significant oxidation of the Al. After melting of the Al phase, redox reactions lead to the formation of elemental Si and SiC as intermediate crystalline phases along with Al₂O₃ both as the crystalline α-phase and dissolved in the amorphous matrix. Mullite formation occurs by precipitation from the matrix at temperatures above 1400°C. In contrast, PMS/Al₂O₃ mixtures did not show mullite formation until heat treatment at 1700°C. In this case no significant intermediate crystalline phases occur, except for some limited cristobalite crystallization from the matrix.