脱磷剂对含炭耐火材料的侵蚀机理研究

通过不同脱磷剂对Ａｌ２Ｏ３ＳｉＣＣ 砖、Ａｌ２Ｏ３Ｃ 砖、ＭｇＯＣ 砖的侵蚀试验,对其侵蚀前后的矿物相变化进行了分析,对其侵蚀机理进行了探讨。     

含炭耐火材料高温抗氧化涂料的研究

介绍了一种新型自愈合耐火抗氧化涂料。此涂料由有机和无机复合酸通过与金属、陶瓷细粉、复合盐及施工性能调节剂充分反应制成。结果表明,在中高温范围内,涂料对含炭耐火材料具有良好的保护效果     

含炭耐火材料用硼化物添加剂

综述了近几年国外研究含炭耐火材料防氧化而采用的一些含硼添加剂，介绍了这些添加剂的特性及其防止碳氧化的基本原理。     

含炭耐火材料表面防氧化涂料的试制

对炭复合耐火材料表面氧化过程及防氧化涂料的性能进行了试验。同时探讨了涂料的防氧化机理。实践表明，这种防氧化涂料，可在铝镁炭包村与渣线部位镁炭砖及铝炭浸入式水口和整体塞棒上使用，表面不氧化，提高了使用寿命。     

含炭耐火材料中碳的定量分析方法

通过成立碳分析研究小组对含炭耐火材料中碳的定量分析方法进行了研究及制定，指出无论采取何种方法，都要综合考虑成分、燃烧条件、标定材料、实际仪器操作及技巧等。     

含炭耐火材料添加Al4SiC4的作用

Ａｌ４ＳｉＣ４是一种极好的抗水化化合物，它作为含炭耐火材料的抗氧化剂，对其性能用作用进行了研究，并探讨了相应机理。Ａｌ４ＳｉＣ４添加到含炭耐火材料中，起初与ＣＯ反应，生成Ａｌ２Ｏ３、ＳｉＣ和Ｃｏ反应后，如果温度在－１５６０℃以下，生成的ＳｉＣ和Ａｌ２Ｏｅ将进一步与ＣＯ应生成莫来石（Ａｌ６ＳｉＣ２Ｏ１３）和Ｃｏ。在耐火材料表面进行的上述反应形成了保护层，这就阻止了耐火材料的氧化。为此，Ａｌ４ＳｉＣ４     

SiC质耐火材料的氧化机理

SiC材料是一种性能优良的耐火材料，具有高导热性，高抗热震性，良好的高温强度等优点，但是由于碳化硅在氧化性气体，如O2，CO2，水蒸汽中发生膨胀劣化，严重影响SiC耐火材料的使用湿度和应用范围，本文主要讨论不同结合剂类型的SiC耐火材料的氧化特征，并提出抗氧化的可能途径。     

含炭耐火材料抗氧化涂料的配制及抗氧化原理

含炭耐火材料在高温下易被氧化,从而造成材料性能急剧下降.靠浸渍溶液或在基质中添加抗氧化剂已不能满足工业发展及某些特殊场合的要求.文章通过对多种氧化物及非氧化物原料的特点进行分析,探讨了研制的自愈合系列高温抗氧化涂料(RefractoryAnti-OxidationCoating,RAOC)的抗氧化机理.     

树脂结合陶瓷/炭复合耐火材料的导电机理

通过对不同电压、不同碳含量与不同热处理温度下树脂结合陶瓷／炭复合导电耐火材料的导电性能分析,建立了陶瓷／炭复合导电耐火材料的导电网络模型     

Mn对含炭耐火材料抗渣侵蚀性的影响

以烧结板状刚玉、锆莫来石、天然鳞片状石墨为主原料 ,酚醛树脂为结合剂 ,Al、Si、B4C、Mn粉为添加剂 ,经 1 4 50℃埋炭烧成后 ,制成铝炭和铝锆炭系列试样 ,并对各试样的抗渣侵蚀性能进行了对比研究。结果表明 :在铝锆炭材料中 ,当Mn与Al、Si复合加入且Mn与C的质量比为 1∶4时 ,试样的抗侵蚀性和渗透性均较好 ;在铝炭材料中 ,当Mn与Al、Si、B4C复合加入且Mn与C的质量比为 1∶4时 ,试样的抗渗透性较好     

含碳耐火材料的防氧化方法

结合含碳耐火材料的抗氧化要求,对添加抗氧化剂技术、表面浸渍抑制氧化法与抗氧化涂层技术及其作用机理进行了综合介绍,并在此基础上对含碳耐火材料防氧化技术的研究方向提出了一些见解。     

碳复合材料的Si-SiO2-SiC抗氧化涂层研究

以石墨、白刚玉、矾土熟料、α-Al2O3为主要原料制备了碳复合材料的基体试样,将基体试样置于密闭的匣钵中并用Si颗粒包埋,经1600℃1h烧成。研究发现在高温及缺氧气氛条件下,埋Si基体试样烧后,在基体的表面反应形成了Si-SiO2-SiC涂层,反应过程的体积膨胀效应增加了表面涂层的密实度。在常压、空气中,烧后试样于1300℃分别进行0.4h和5h的氧化试验,结果表明随氧化时间的延长,试样表面的Si不断氧化,形成了连续、密实的SiO2薄膜,堵塞气体侵入的通道,赋予试样优良的抗氧化性能。在涂层与基体的结合部位为富含SiC的过渡连接层,在涂层的外表面为SiO2的表面涂层,涂层为具有良好抗热震性能的功能梯度涂层。     

Si在硅线石结合SiC窑具材料中的行为

本文就金属Ｓｉ对硅线石结合碳化硅材料的基质结构以及对材料性能的影响进行了研究，结果表明，金属Ｓｉ可显著提高该种材料的强度、密度以及抗热震性能。     

钢液对连铸用含碳耐火材料的侵蚀作用研究

采用中频炉的实验室模拟试验(试验条件:钢液温度1600℃,浸入时间30min,气氛分别为空气和真空)和通过对用后耐火材料的显微结构分析,研究了钢液对3种连铸用含碳耐火材料(Al2O3-C、MgO-C和ZrO2-C)的侵蚀作用。结果表明,脱碳层的形成及钢液中夹杂物与脱碳层中耐火氧化物的反应是材料蚀损的主要原因。因此,在含碳耐火材料接触钢液的表面形成致密耐火层,能有效抑制钢液对连铸用含碳耐火材料的侵蚀。     

The microstructure evolution and mechanical properties of MgO-C refractories with recycling Si/SiC solid waste from photovoltaic industry

In the present work, the recycling of Si/SiC solid waste from photovoltaic industry for MgO-C refractories preparation has been introduced. The influence of solid waste powders as antioxidant additive on microstructure evolution, mechanical properties and thermal shock resistance of MgO-C refractories has been investigated systematically. With 4?wt% Si/SiC rich solid waste addition, the MgO-C refractories exhibited the highest strength (4.39?MPa) and residual Young's modulus (7.86?GPa) after firing at 1400?°C, compared to only Si or SiC-addition. The presence of iron in the solid waste also promoted the formation of MgO and Mg₂SiO₄ whiskers via catalyst-assisted method. Moreover, a dissolution-saturation-precipitation growth mechanism was used to explain the formation process of the whiskers. The improvements in strength as well as thermal shock resistance can be attributed to the microstructural evolution.     

电站锅炉用SiC质耐火材料抗渣性的研究

以SiC粉和Al2O3粉为主要原料,分别添加5%(质量分数,下同)的ZrO2粉或锆英石粉和5%、10%的Cr2O3粉以及4%的羧甲基纤维素(CMC),按照配料组成配料后,以成型压力为20 MPa制成40 mm×40 mm×30 mm的试样.试样经120℃干燥8 h后,置于硅钼棒炉中.于1 420 ℃保温5 h烧成后,分别采用经900℃保温2 h处理后的粉煤灰在1 400和1 450 ℃下进行抗侵蚀试验.结果表明:SiC质材料随着温度的升高,抵抗灰渣侵蚀能力不断下降,在1 400 ℃时的抗渣性明显优于1 450 ℃时的;在SiC质材料中分别加入5%的ZrO2或锆英石,前者的抗渣性能强于后者;含Cr2O3为10%的SiC质材料比含5%Cr2O3的具有更好的抗渣性.     

Electrical characterizations of Neutron-irradiated SiC Schottky diodes

Neutrons with an average energy of 9.8±0.8 MeV were irradiated onto silicon carbide Schottky diodes. After bombardment at a fluency of 2.75×10¹¹ neutron/cm², the Schottky barrier height, ideality factor, and the leakage currents remained unchanged. The electrical properties began to deteriorate after bombardment at a fluency of 5.5×10¹¹ neutron/cm². In this study, we demonstrate that SiC SBD is robust under neutron irradiations and is well suited for space operations up to bombardments at a fluency of 2.75×10¹¹ neutron/cm². This article is dedicated to Professor Chul Soo Lee in commemoration of his retirement from Department of Chemical and Biological Engineering of Korea University.     

Fabrication of novel AlN-SiC-C refractories by nitrogen gas-pressure sintering of Al4SiC4

Novel AlN-SiC-C refractories were fabricated by nitrogen gas-pressure sintering using single Al₄SiC₄ as raw-material. The high nitrogen pressure is essential and effective for the nitridation because it contributes to the diffusion of the nitrogen atoms into the interior matrix of Al₄SiC₄ specimen. Different from traditional carbon-containing refractories and ceramic bonded carbon materials (CBCs), the resulted products possess a honeycomb microstructure consisting of interlocked structure of worm-like SiC and C particles with a AlN ceramic boundary. AlN-SiC nanoparticles and aluminum carbonitride particles (Al-C-Ns) were formed at the interface between AlN-rich and C/SiC-rich area, which acted as transition phases that make these two areas combined tightly. The as-prepared AlN-SiC-C refractories at 1700 ℃ by a 20 atm pressure showed a relative density of 75.8%, combining a bulk density of 2.20 g/cm³ with a flexural strength of 120.9 MPa. Furthermore, the potential reaction mechanism responsible for fabrication of AlN-SiC-C refractories was revealed.     

反应烧结用碳化硅/酚醛树脂混合物成型特性研究

反应烧结是制备碳化硅材料的廉价工艺。结合热固性塑料成型技术，本文对加入酚醛树脂作为粘接剂和碳源的碳化硅粉体的成型性能进行了研究，并阐明了影响成型性能的因素。     

Oxidation protection of SiC in porcelain tile ceramics by adding Si powder

Polishing porcelain tile residues (PPR) have accumulated to millions of tons and increases every year. It has become important to recycle the PPR due to the economic gains and environmental sustainability of doing so. However, its direct recycling in the production of porcelain tile has been limited by the fact that SiC particles oxidise during sintering which prevents the processing of dense ceramics. In this study, Si powder was introduced into the porcelain ceramics matrix containing SiC. The effect of Si powder additive on inhibiting the oxidation of SiC was evaluated using the relative density and the microstructure of the sintered samples. Results showed that the porcelain body containing SiC could be fully densitified when the suitable content of Si powder addition is introduced. These results indicate that it is a promising method to effectively protect the oxidation of SiC particles in the porcelain ceramics matrix during sintering.