Al2O3和SiC对混杂al基复合材料烧结及力学性能影响的研究

IF 0.6 4区 材料科学 Q3 MATERIALS SCIENCE, CERAMICS
Yogendra Sharma, Alok Bhadauria, Ashutosh Sahu, Ram Sajeevan Maurya
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引用次数: 0

摘要

在550℃、50 MPa、保温15 min的条件下,通过机械合金化和火花等离子烧结制备了Al-SiC (8 wt.%) -Al2O3 (2 wt.%)和Al-SiC (6 wt.%) -Al2O3 (4 wt.%)体块复合材料。在固结后,与粉末样品相比,散装样品没有出现任何新的峰,从XRD图中可以看出。用维氏显微硬度计分析了烧结试样在1 N下保持20 s的硬度,并通过微动磨损试验研究了试样在20和30 N载荷下的耐磨性。烧结10 min后,固结样品的维氏显微硬度分别为1.5±0.5 GPa和1.4±0.35 GPa。保温时间延长至15 min后,硬度值分别降至1.35±±0.45 GPa和1.34±0.25 GPa。与20 N载荷相比,30 N载荷下的磨损体积损失更高,这是由于试样的变形和粗糙表面的形成,导致试样破裂。两种成分烧结10 min后的试样抗压强度分别为492和476 MPa。当烧结时间延长至15 min时,强度分别降至482 MPa和467 MPa。硬度和抗压强度值的降低可归因于在较长的保温时间下晶粒尺寸的增大。断口在Al基体和增强相中表现为韧性断裂和脆性断裂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Study of Al2O3 and SiC Effect on Sintering and Mechanical Properties of Hybrid Al-Based Composites

Study of Al2O3 and SiC Effect on Sintering and Mechanical Properties of Hybrid Al-Based Composites

In this research work, Al–SiC (8 wt.%)–Al2O3 (2 wt.%) and Al–SiC (6 wt.%)–Al2O3 (4 wt.%) bulk composites were synthesized via mechanical alloying and spark plasma sintering at 550°C and 50 MPa for and 15 min hold. After consolidation, bulk samples did not exhibit any new peaks compared to powder samples, as indicated by XRD patterns. The hardness of the sintered samples was analyzed by a Vickers microhardness tester at 1 N for 20 s hold, and the wear resistance of the samples was studied by fretting wear test at 20 and 30 N loads. The consolidated samples exhibited Vickers microhardness of 1.5 ± 0.5 GPa and 1.4 ± 0.35 GPa for the two compositions sintered for 10 min hold. When the holding time increased to 15 min, the hardness values decreased to 1.35 ± ± 0.45 GPa and 1.34 ± 0.25 GPa, respectively. The wear volume losses were higher at 30 N load compared to 20 N load due to higher deformation and formation of a rough surface in the sample, leading to the sample's breaking. The bulk samples of the two compositions sintered for 10 min hold exhibited compression strengths of 492 and 476 MPa, respectively. The strength decreased to 482 and 467 MPa, respectively, when the sintering time was increased to 15 min. The decrease in hardness and compressive strength values can be attributed to increased grain size at a higher holding time. The fracture surface exhibited ductile and brittle fracture modes in the Al matrix and reinforcement phases.

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来源期刊
Powder Metallurgy and Metal Ceramics
Powder Metallurgy and Metal Ceramics 工程技术-材料科学:硅酸盐
CiteScore
1.90
自引率
20.00%
发文量
43
审稿时长
6-12 weeks
期刊介绍: Powder Metallurgy and Metal Ceramics covers topics of the theory, manufacturing technology, and properties of powder; technology of forming processes; the technology of sintering, heat treatment, and thermo-chemical treatment; properties of sintered materials; and testing methods.
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