共查询到19条相似文献,搜索用时 78 毫秒
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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。 相似文献
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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。 相似文献
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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。 相似文献
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乙醇胺衍生表面活性剂的制备、性能及应用 总被引:6,自引:0,他引:6
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。 相似文献
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Anna V. Gubarevich Tsubasa Watanabe Toshiyuki Nishimura Katsumi Yoshida 《Journal of the American Ceramic Society》2020,103(2):744-749
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. 相似文献
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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。 相似文献
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《Ceramics International》2022,48(17):24592-24598
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 m1/2. 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. 相似文献
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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。 相似文献
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《Journal of the European Ceramic Society》2020,40(15):5172-5179
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. 相似文献
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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. 相似文献