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排序方式: 共有265条查询结果,搜索用时 31 毫秒
1.
《Journal of the European Ceramic Society》2020,40(14):4792-4798
The multilayer ceramic composites (MLC) consist of two ceramic materials insoluble in each other and sequentially piled in a symmetric manner whereas they can be divided into two groups: multilayer composites with weak interfaces and composites with strong interfaces. The graphene added multilayer ceramic sandwich (GMCS) composite was developed. The multilayer stack of Si3N4 with 5 and 30 wt% graphene addition were stratified in sandwich structure. So formed multilayer stacks with 5 and 7 layers were sintered by hot issostatic pressing (HIP). The homogenity of graphene addition, the effect of layered structures and the position of layers with lower and higher graphene content on the final properties were studied. 相似文献
2.
涡轮叶轮用铸造高温合金的热等静压处理研究 总被引:1,自引:0,他引:1
对涡轮叶轮用铸造高温合金进行热等静压处理。结果表明,通过热等静压处理,铸造高温合金的疏松缺陷减少,显微组织均匀细化,合金致密度提高,而且力学性能得到了改善。 相似文献
3.
粉末冶金/热等静压(PMHIP)零件的生产工艺与设计准则 总被引:1,自引:0,他引:1
热等静压(HIP)经过几十年发展,现已成为一种用各种金属和/或陶瓷制造形状复杂的、高性能零件的,竞争性制造技术。这些零件现已用于许多对环境要求高的产业部门,例如:航空航天、近海油与气田、能源及医疗等。这篇评述主要讲述关于在金属包套中压制金属粉末的HIP工艺过程,即所谓的PM HIP零件的生产工艺、设计准则及其应用。 相似文献
4.
5.
《Fusion Engineering and Design》2014,89(2):137-141
An oxide dispersion strengthened ferritic steel with a nominal composition of Fe–14Cr–2W–0.3Ti–0.3Y2O3 (in wt.%) was consolidated by hot isostatic pressing at 1150 °C under various pressures in the range of 185–300 MPa for 3 h. The microstructure, microhardness and high temperature tensile properties of the steel were investigated. With increasing compaction pressure the density of specimens also increased, however OM and SEM observations revealed residual porosity in all tested specimens and similar ferritic microstructure with bimodal-like grains and numerous of large oxide particles, located at the grain boundaries. Mechanical testing revealed that compaction pressure has negligible influence on the hardness and tensile strength of the ODS steel, however improves the material ductility. 相似文献
6.
AbstractOrdered B2-NiAl intermetallic compound powder was successfully synthesised by mechanical alloying after 20 h in an attritor mill, starting from elemental Ni and Al powders and without subsequent heat treatment. NiAl powder obtained was homogenous and had a nanocrystalline microstructure. It was consolidated by field assisted hot pressing (FAHP), in a novel configuration with a Gleeble 3800 thermomechanical simulator. The powder was also processed by hot isostatic pressing (HIP) in order to compare both methods. The consolidation was successful by both methods obtaining above 98% of NiAl theoretical density (5·86 g cm?3). The results showed that the consolidation process by FAHP technique is effective and uniform throughout the sample as indicated by homogenous hardness values, obtaining microstructure and properties similar to those obtained with HIP technique, with certain advantages over it. The achieved room temperature yield strength of 850 MPa and fracture strain 26–28% corresponds to the bulk values of NiAl intermetallic. 相似文献
7.
采用热等静压法制备了纯钒样品,测试了纯钒在700~1100 ℃下的高温力学性能,分析了高温拉伸样品的断口形貌、金相组织。结果表明,随温度的升高,纯钒的强度及韧性均呈下降趋势。700~800 ℃,纯钒具有较好的高温强度及韧性,断口为韧性特征;900~1100 ℃,纯钒的力学性能急剧恶化,断口上出现了大量的解理面及一定的由高温蠕变导致的韧性沿晶,呈现出韧脆断共存的微观形貌;温度升高,解理面有长大趋势。 相似文献
8.
Processing of polymers depends on corrosion‐ and wear resistant tool materials being in direct contact with the feedstock material. Plastic mold steels, a special group of tool steels, are successfully applied here, offering both a good wear and corrosion resistance. The lifetime of tools used for plastic processing not only depends on wear and corrosion resistance but also on the mechanical properties of the tool material for example, its flexural strength. In this work, mechanical tests of a commercial plastic mold steel were performed and related to the heat treatment. A close correlation of the amount of retained austenite and carbides and the mechanical properties was encountered. The paper discusses strategies to optimize the mechanical properties by an adequate heat treatment with regard to the resulting corrosion and wear resistance. 相似文献
9.
《Ceramics International》2015,41(8):9622-9627
In this work, Zr-doped Y2O3 transparent ceramics were fabricated by vacuum pre-sintering at various temperatures ranging from 1650 to 1800 °C combined with a post-hot-isostatic pressing (HIP) treatment. The pre-sintered samples all show black opaqueness mainly due to the formation of oxygen vacancies, which can be removed by post-annealing in air. The HIP treatment can also eliminate the blackness as well as residual pores, giving rise to optical transparency. The in-line transmittance of the samples after HIP was found to depend strongly on the microstructure of the as-sintered samples. The optimal microstructure of these types of samples before the HIP treatment should be fine grained with only intergranular pores, which can easily be removed by HIP. Annealing before HIP was shown to be necessary to enhance the transmittance of the samples. The effects of the pre-sintering heating rate on the optical transmittance of the HIP-treated samples were also studied. 相似文献
10.
在汽轮机的制造过程中,为了确保产品(如高中压外缸)能安全运行,通常需要使用水压试验的方法对主要承压产品进行检测。水压试验的要求高于产品设计要求,其结果将作为承压产品是否合格的重要依据。 相似文献