AlON-TiN复相材料的合成及工艺优化

在对Ti—Al-O-N体系热力学分析的基础上合成了AlON—TiN复相材料，XRD，TEM分析与观测结果证实了热力学分析的可靠性。运用人工神经元网络(artificial neural networks，ANN)对合成AlON—TiN的工艺参数进行了训练，训练结果良好，神经网络的预测值和实测值一致；遗传算法(genetic algorithm，GA)寻优得到最佳工艺参数：烧结温度为1830℃，保温2．45h，TiN的含量为15％(质量分数)。对遗传算法寻优结果进行了单因素分析，随着TiN含量的增加，强度增加，而随烧结温度和保温时间的增加，强度先增加后减小。     

热压合成AlON-VN复合材料的性能与结构

对V-Al-O-N体系进行了热力学分析,并证实了添加TiN还可以抑制AlON的分解,扩大了阿隆复合材料的使用范围.在此基础上,热压合成了阿隆-氮化钒(AlON-VN)复合材料.对该材料的力学性能和显微结构进行了分析.结果表明VN均匀分布于AlON基体中形成交织状结构,有利于增韧补强,因此AlON-VN复合材料的力学性能优于纯AlON材料.     

Effect of B2O3 on the Structure and Viscous Behavior of Ti-Bearing Blast Furnace Slags

This study provided a fundamental analysis of the viscous behavior and structure of Ti-bearing blast furnace slags modified by different B₂O₃ additions with a basicity (CaO/SiO₂) range of 0.5–0.9. The viscosity of slag melts was measured by rotating cylinder method, and the results showed that both slag viscosity and apparent activation energy for viscous flow remarkably decreased with B₂O₃ addition. To connect the viscosity variation of slags to the melt structure, Fourier transformation infrared spectroscopy analysis was performed. The results indicated that B₂O₃ acted as a typical network forming oxide, which was introduced into the network and existed dominantly as a two-dimensional structure, BO₃ triangular. With the increase of B₂O₃ content, the stretching vibration of BO₃ triangular gradually became more pronounced, which resulted in a simpler and less complex structure and caused the decrease of slag viscosity.     

Investigation of the Viscosity and Structural Properties of CaO-SiO2-TiO2 Slags

The viscosity of CaO-SiO₂-TiO₂ slags was measured via the rotating cylinder method to reveal the effect of TiO₂ on viscous flow of the slags. Furthermore, the structure of the ternary slags and the role of Ti⁴⁺ were investigated by Fourier transform infrared and Raman spectroscopy techniques. The results are beneficial for a better understanding of the behaviors of Ti-bearing silicate slags. The TiO₂ additions lowered the viscosity and apparent activation energy of the slags. However, the degree of polymerization (DOP) of silicate network was found to be enhanced with increasing the TiO₂ content, which is suggested by the increase in mole fraction of Q ³ ([SiO₄]-tetrahedra with three bridging oxygens) and the decrease in Q ⁰. The Eq. [2] Q ² ? Q ¹ + Q ³ was appropriate to express the relationship of different Q ⁿ species. The introduction of Ti⁴⁺ into the silicate network as network formers increased the DOP but weakened the strength of slag structure at the same time. Besides, a large proportion of Ti⁴⁺ exists in the slag in the form of \( TiO_{4}^{4 - } \) monomers, resulting in a decrease of viscosity with increasing TiO₂ content.     

Structural Investigation of Phosphorus in CaO-SiO2-P2O5 Ternary Glass

Metallurgical and Materials Transactions B - The system of CaO-SiO2-P2O5 ternary glass is not only among the major constituents of steelmaking slags in iron and steel industry, but also play a...     

The Effect of P2O5 on the Crystallization Behaviors of Ti-Bearing Blast Furnace Slags Using Single Hot Thermocouple Technique

The present paper investigates how the P₂O₅ addition influences the crystallization behaviors of Ti-bearing blast furnace (Ti-BF) slags with different basicity using Single Hot Thermocouple Technique. It was found that the basicity showed a significant effect on the crystallization behaviors of the Ti-BF slags, and the trend of formation of the rod-shape crystal decreased while the trend of formation of dendrite crystal increased with increasing basicity. The addition of P₂O₅ was found to promote the formation of rod-shape crystal. The basicity and crystallization temperature that the rod-shape crystal could be formed increased, while the incubation time of formation of the rod-shape crystal decreased with increasing P₂O₅ content. Scanning electron microscope equipped with energy-dispersive X-ray spectroscope and X-ray diffraction were employed to observe the morphology and determine the crystalline phase of the Ti-enriched crystals. The results indicated that the rod-shape crystal was rutile. The kinetics of the formation of rutile was studied, and the mechanism of crystallization and growth was further discussed. The results indicated that the crystallization of rutile was one-dimensional interface-controlled growth, and the nucleation rate varied with the holding time.     

4632号酯型难燃液压油的工业应用

概述了国内外不同类型的抗燃液压油性能及其发展趋势,介绍了符合环保要求的4632号酯型难燃液压油在钢铁、机械等行业的工业应用。     

活性粉末混凝土的研究与工程应用进展

活性粉末混凝土(RPC)由于其高强度、高韧性、低孔隙率和极低渗透性引起了国内外研究人员的重视。首先讨论了RPC的设计原理;对比了RPC与其他混凝土结构的力学和耐久性等性能,指出RPC具有突出的优异性能;详细介绍了RPC在预制结构、预应力结构等领域的工程应用,分析了RPC目前所面临的问题。在未来的几十年中,RPC将作为高性能的混凝土广泛应用于各种建筑工程中。     

The Influence of SiO2 on the Extraction of Ti Element from Ti‐bearing Blast Furnace Slag

The present paper investigated the crystallization behavior of Ti‐concentrating phases in titanium‐bearing blast furnace slags influenced by the silica content. The objective was to recycle the titanium from titanium‐bearing blast furnace slags by enriching Ti element in anosovite. The effect of SiO₂ on the formation of anosovite in the titanium‐bearing blast furnace slags was studied under C/CO equilibrated atmospheres using a combination of X‐ray Diffraction (XRD) and Energy Dispersive X‐ray Spectroscopy (EDX). It was found that, under the C/CO equilibrated atmospheres, the formed primary phases transformed from perovskite to anosovite by adding SiO₂ up to 35 wt% in the slags. The related mechanism was investigated according to the theory of molten slags structure and the principle of thermodynamics.     

AlON及其复相材料的新进展和展望

从氮氧化铝(AlON)的研究现状来看，研究AlON材料的物理化学性能、可行的合成方法是两个关键技术，这对该材料在众多领域的应用将起重要的作用。针对限制AlON应用的弱点，结合近几年国内外的研究，综述了AlON材料在合成工艺-纳米AlON粉的制备方法、物理性能-引入第二相形成复相材料、化学性能-稳定性能、抗氧化、抗侵蚀性能等方面的最新进展，为AlON的广泛应用打下了理论基础。并展望了AlON及其复相材料的发展前景。