AOS的制备、性能和应用

本文叙述了在ＡＯＳ制备过程中的一些工艺控制条件和产品的性能及其在化妆品、清洁用品和其他工业中的应用。最后简要地叙述了建设ＡＯＳ、ＬＡＳ、ＡＥＳ生产厂的投资及其成本费用情况。     

基于铝粉为原料制备的三元碳化物Al4SiC4的研究进展

本文综合介绍Al4SiC4的最新研究进展。三元碳化物Al4SiC4属于六方晶体结构，空间群为P63mc,它具有优异的的高温抗氧化性能；优良的热稳定性和良好的室温及高温力学性能等。     

氧化锆纤维的制备、性能和应用

主要介绍了氧化锆纤维的制备方法、性能及应用。氧化锆纤维的主要制备方法有前驱体载体溶液浸渍法、共混纺丝法、熔胶凝胶法和静电纺丝法等。氧化锆纤维最突出的性能是优异的耐高温和隔热性能,作为聚合物基、金属基或陶瓷基复合材料的增强纤维,广泛应用于航空航天和国防军事等领域。     

脂肪酸甲酯磺酸盐的制备、性能及应用研究进展

脂肪酸甲酯磺酸盐是一种生物相容性好、去污力优良和抗硬水能力强的高效、低毒表面活性剂。简要介绍了脂肪酸甲酯磺酸盐的制备方法、物理化学性能及其在洗涤剂中的应用。     

蜂窝陶瓷的制备、性能及其应用

本对蜂窝陶瓷的制备、性能、应用等方面作了详细的论述,指出蜂窝陶瓷在环保领域前景广阔。     

Sialon陶瓷复合材料的制备、性能及其应用

sialon陶瓷复合材料是一种比单相sialon性能更优良的高技术新材料。本文较全面地介绍了它的制备方法,特别是对近年发展起来的制备新技术和目前已制备出的sialon复合材料的性能以及应用,作了详尽的阐述。     

聚酰亚胺气凝胶制备、性能及应用进展

聚酰亚胺气凝胶具有高比表面积、低密度、低热导率等优点,但是存在易吸湿、收缩率大且在制备过程中大量使用有机溶剂以及使用价格昂贵的化学交联剂等问题。本文主要介绍了目前聚酰亚胺气凝胶的制备方法、性能及其应用,重点综述了二酐与二胺缩合反应法、异氰酸酯法、开环易位聚合法。简述了几种方法的制备原理,同时也总结了聚酰亚胺气凝胶在隔热、抗辐射、油水分离、过滤等领域应用的研究进展。最后,对聚酰亚胺气凝胶的制备方法及实际应用进行了总结与评价,提出在今后的研究工作中要以解决易吸湿、收缩率大、探索其他类型交联剂作为重点。并且,立足于目前聚酰亚胺气凝胶及其复合材料的发展趋势,对今后聚酰亚胺气凝胶新的存在形态、新的应用领域进行了展望。     

乙醇胺衍生表面活性剂的制备、性能及应用

乙醇胺是重要的化工原料，在许多工业领域有着广泛的应用，本文重点论述了以乙醇胺为基本原料制备非离子型、阴离子型、阳离子型和两性离子型表面活性剂的合成路线，产品性能和应用领域。     

Combustion synthesis of single-phase Al4SiC4 powder with assistance of induction heating

Ternary aluminum silicon carbide Al₄SiC₄ is a promising material not only in refractory applications, but also in electronics and photocatalysis. However, synthesis of Al₄SiC₄ requires high-temperature heat treatment for several hours. In this work, we describe a new, fast and effective method to synthesize single-phase Al₄SiC₄ powder. Our method is based on combustion synthesis reaction of Al, Si and C initiated under high-frequency induction heating. Heating program was optimized to prevent separation of melted aluminum and provide uniform initiation, propagation and completion of the reaction. As a result, pure-phase Al₄SiC₄ powder was synthesized in few minutes. Temperature profile of a sample measured during heating process showed appearance of two exothermic peaks, thus confirming propagation of a two-step combustion reaction. Induction heating provided capability to finely and readily control external heating rate, which is considered to be one of the key factors to reach high-purity Al₄SiC₄.     

SiC／Al复合材料的组织与力学性能研究

采用无压浸渗法制备了SiC／Al复合材料．研究不同颗粒大小的复合材料的抗弯强度、金相组织和断裂机理。结果表明：颗粒尺寸为20um的SiC／Al复合材料抗弯强度最高：小颗粒复合材料的断裂以沿晶断裂为主，局部有韧性撕裂的特征，而大颗粒还伴有穿晶解理特征。     

Preparation,microstructure and ion-irradiation damage behavior of Al4SiC4-added SiC ceramics

Single-phase Al₄SiC₄ powder with a low neutron absorption cross section was synthesized and mixed with SiC powder to fabricate highly densified SiC ceramics by hot pressing. The densification of SiC ceramics was greatly improved by the decomposition of Al₄SiC₄ and the formation of aluminosilicate liquid phase during the sintering process. The resulting SiC ceramics were composed of fine equiaxed grains with an average grain size of 2.0 μm and exhibited excellent mechanical properties in terms of a high flexure strength of 593 ± 55 MPa and a fracture toughness of 6.9 ± 0.2 MPa m^1/2. Furthermore, the ion-irradiation damage in SiC ceramics was investigated by irradiating with 1.2 MeV Si⁵⁺ ions at 650 °C using a fluence of 1.1 × 10¹⁶ ions/cm², which corresponds to 6.3 displacements per atom (dpa). The evolution of the microstructure was investigated by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The breaking of Si–C bonds and the segregation of C elements on the irradiated surface was revealed by XPS, whereas the formation of Si–Si and C–C homonuclear bonds within the Si–C network of SiC grains was detected by Raman spectroscopy.     

Al2O3/SiC纳米复合陶瓷的制备及性能

在Al2O3陶瓷基体中引入第2相纳米SiC颗粒,可以改善力学性能、耐磨损性能,是陶瓷领域研究的热点之一。纳米颗粒的均匀分散和适当的成型烧结决定了其性能。本文就目前存在的Al2O3/SiC纳米复合陶瓷粉体制备方法与烧结工艺进行了详细阐述。     

铝对高岭石熟料合成Al_4SiC_4-Al_4O_4C复合材料的影响

将高岭石熟料粉、炭黑粉和金属铝粉按n(A l2O3):n(C):n(A l)=1:6.5:2.6配料作为基料,保持高岭石熟料粉和炭黑的量不变,改变金属铝粉的量,使n(A l)从2.6分别增加到3.9、5.5、7.0、8.6和10.4,以酚醛树脂为结合剂,无水酒精为分散剂,混匀后压制成型,坯体试样干燥后,在刚玉质管式炉内,氩气气氛下,于1 700℃保温2 h制备了A l4SiC4-A l4O4C复合材料。利用DTA-TG、XRD和SEM等测试技术,研究了铝粉加入量对该材料相组成和显微结构的影响。结果表明:在一定范围内随着金属A l粉加入量的增加,A l4SiC4产物的含量也会相应的增加。试样中生成的A l4SiC4有片状和块状两种形貌,粒径分别在5~15和10~20μm之间。金属A l粉添加量的增加,对A l4SiC4晶粒形状和粒径影响不大;合成的A l4O4C粒径一般在1μm以下,主要分布在A l4SiC4晶粒表面,形状无规则,部分还粘结在一起。     

High-strength SiC joints with a novel in-situ formed SiC/Al4SiC4 joining filler

The in-situ formed SiC/Al₄SiC₄ joining layer was used to join monolithic SiC using an electric field-assisted sintering technique. A multiphase powder of Al₄C₃/SiC/Al₄SiC₄ was used as the initial joining material to obtain the in-situ reaction layer of SiC/Al₄SiC₄ via the appropriate interface reactions. The bending strength as high as 240.5 ± 6.6 MPa was obtained for the sample joined at 1800 °C, which was higher than the strength of the un-joined SiC matrix. Sound joints were obtained when Al₄C₃ was completely transformed to Al₄SiC₄, and a fully dense SiC/Al₄SiC₄ joining layer was consolidated. The integration of the joining layer with the SiC matrix was improved by a high amount of liquid phase formed at the interface. The proposed SiC/Al₄SiC₄ joining layer, with good thermal matching with SiC matrix, shows a great potential to be applied as a joining material for SiC-based ceramic matrix composites.     

Microstructure,wear and corrosion characteristics of multiple-reinforced (SiC–B4C–Al2O3) Al matrix composites produced by liquid metal infiltration

In this study, AA7075 aluminum matrix composites reinforced with the combination of SiC, Al₂O₃, and B₄C particles were fabricated by the liquid metal infiltration method. The effects of the relative ratio of B₄C and Al₂O₃ particles on the microstructural, wear, and corrosion features of the composite samples were analyzed using XRD, light metal microscopy, SEM, EDS, Brinell hardness, ball-on-disc type tribometer, and potentiodynamic polarization devices. It was determined that infiltration occurred more successfully, and homogenously distributed particles with reduced porosity were obtained as the amount of Al₂O₃ increased. Worn surface studies revealed that the specimens were predominantly worn by abrasion and adhesion. The increase in B₄C/Al₂O₃ ratio caused a decrease in the hardness and wear strength, whereas it increased the corrosion resistance.     

氮化硅结合碳化硅材料的生产与应用

阐述了氮化硅结合碳化硅窑具材料的生产技术、生产工艺流程及使用情况。指出作为现代窑具的替代产品,它具有较好的市场前景