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Design and development of advanced castable refractory materials.

机译：先进可铸造耐火材料的设计和开发。

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摘要

New formulations of castable refractory composite materials were studied. This technology is used to produce low cost composite concrete structures designed for high temperature stability, superior wear resistance and improved strength.; An in situ fired, castable cement installation is a heterogeneous structure divided into three zones according to the temperature history and microstructure. The properties of each zone depend on the predominant bonding mode between constituents. Each zone has a characteristic microstructure that influences the integrity of the monolith. The hot side may have a highly dense and developed network of ceramic bonds between constituent particles while the cold side may never reach temperatures sufficient to drive off free water. The thermal, structural and tribological properties depend on the microstructure and the type of bonding that holds the monolith together.; The phase distributions are defined by sets of metastable phase conditions driven by the local hydrated chemistry, nearest neighbor oxide compounds, impurities and sintering temperature. Equilibrium phase diagrams were used to select optimum compositions based on higher melting point phases. The phase diagrams were also used to target high temperature phase fields that are stable over wide temperature and stoichiometric ranges.; Materials selection of candidate hydraulic clinkers, high temperature oxides, and reinforcement phases were based on requirements for high temperature stability. The calcium aluminate (CaO-Al2O3) and calcium dialuminate (CaO-(Al2O3)2) are common refractory clinkers used in castable refractory cements. The thermodynamics and kinetics of cement hydrate formation are well studied and suited to become the building block of a design for a superior refractory castable cement. The inert oxides mixed with the calcium aluminate clinkers are magnesia (MgO), alumina (Al 2O3), spinel (MgAl2O4) and chromic (Cr2O3). The bulk of the experiments concentrated in the Al2O3–MgO–CaO ternary system.; Materials selection criteria for reinforcement materials was based on improved high temperature stability, increased strength, reduced thermal expansion mismatch, low thermal conductivity and increasing wear resistance. The reinforcement phases selected for this investigation are zircon (ZrSiO4), zirconia (ZrO2), spinel (MgAl2O4) and dead burnt magnesia (MgO).; Batches of the formulations were tested for thermal conductivity, wear resistance and mechanical strength. Relative rankings of the formulations against commercial products indicate improved or similar performance with increased maximum temperature limits and improved thermal insulating power. The new cement formulations proved to exhibit superior high temperature stability with an increasing volume fraction of high temperature oxides. The addition of reinforcement aggregates and powder sizing to offset the loss of strength. The room temperature compression strength and wear resistance of the optimized formulations exceeded the properties of conventional refractory, brick and castable cement tested concurrently.
机译：研究了可浇注耐火复合材料的新配方。该技术用于生产低成本复合混凝土结构，以实现高温稳定性，优异的耐磨性和提高的强度。现场浇注的可浇注水泥装置是一种异质结构，根据温度历史和微观结构分为三个区域。每个区域的属性取决于成分之间的主要键合模式。每个区域都有一个特征性的微观结构，会影响整体结构的完整性。热侧在组成颗粒之间可能具有高度致密且发达的陶瓷结合网络，而冷侧可能永远无法达到足以驱除自由水的温度。热，结构和摩擦学性能取决于将整体材料保持在一起的微观结构和键合类型。由局部水合化学，最邻近的氧化物化合物，杂质和烧结温度驱动的亚稳态相条件组定义了相分布。平衡相图用于根据较高的熔点相选择最佳组成。相图还用于确定在宽温度和化学计量范围内稳定的高温相场。候选液压熟料，高温氧化物和增强相的材料选择基于高温稳定性的要求。铝酸钙（CaO-Al 2 O 3 ）和钙铝酸钙（CaO-（Al 2 O 3 ） 2 ）是可浇铸耐火水泥中常用的耐火熟料。水泥水合物形成的热力学和动力学已得到充分研究，适合成为优质耐火浇注水泥设计的基础。与铝酸钙熟料混合的惰性氧化物是氧化镁（MgO），氧化铝（Al 2 O 3 ），尖晶石（MgAl 2 O < sub> 4 ）和铬（Cr 2 O 3 ）。实验的大部分集中在Al 2 O 3 –MgO–CaO三元体系中。增强材料的材料选择标准是基于改善的高温稳定性，增加的强度，减少的热膨胀失配，低的导热性和增加的耐磨性。选择用于研究的增强相是锆石（ZrSiO 4 ），氧化锆（ZrO 2 ），尖晶石（MgAl 2 O 4 ）和烧死的氧化镁（MgO）。测试批次的制剂的导热率，耐磨性和机械强度。制剂相对于商业产品的相对排名表明，随着最大温度极限的提高和绝热能力的提高，性能得到改善或相似。事实证明，随着水泥氧化物体积分数的增加，新的水泥配方表现出优异的高温稳定性。添加补强骨料和上浆以弥补强度损失。优化配方的室温压缩强度和耐磨性超过了同时测试的常规耐火材料，砖和可浇注水泥的性能。

著录项

  • 作者

    Davis, Robert Bruce.;

  • 作者单位

    OGI School of Science & Engineering.;

  • 授予单位 OGI School of Science & Engineering.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 419 p.
  • 总页数 419
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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