热压烧结Al2O3/Al-steel Mesh-Al 层状复合材料的制备和性能

doi:10.15541/jim20140410

摘要/Abstract

摘要：

在580℃和1.5 MPa的条件下用热压烧结的方法制备出了一系列Al₂O₃/Al-steel mesh-Al层状复合材料, 该复合材料是由两层铝箔和一层丝网构成的“sandwich”结构, Al-steel mesh-Al为中间夹层。结果显示, Al₂O₃/Al的界面粘结紧密并且没有反应发生。在Al/steel的界面处出现了金属间化合物, 该化合物改善了Al与丝网之间的结合性能。相比于纯Al₂O₃, Al₂O₃/Al-steel mesh-Al层状复合材料强度差别不大, 但具有更高的断裂韧性和断裂功。裂纹扩展分析认为层状复合材料断裂韧性和断裂功的提高得益于裂纹钝化和捕获, 界面分离, 裂纹桥接和Al-steel mesh-Al的塑性变形等机制。落锤冲击结果表明, Al₂O₃/Al-steel mesh-Al层状复合材料具有较好的抗冲击性能。

关键词: 氧化铝, Al-丝网, 热压烧结, 层状复合材料, 力学性能, 落锤冲击

Abstract:

Al₂O₃/Al-steel mesh-Al laminated composites with “sandwich” Al-steel mesh-Al layer as interlayer, which was consisted of two Al foils and one steel mesh, were prepared by vacuum hot pressing at 580℃ and 1.5 MPa. The results indicate that the interface of Al₂O₃/Al is bonded tightly and no reaction is observed. Intermetallic compound (IMC) is detected in Al/steel interface which improves the connection conditions between the steel and Al. The laminated composites have much higher fracture toughness, work-of-fracture than that of the Al₂O₃ monolith, as well as having a close strength to Al₂O₃. Crack blunting and arresting, crack bridging, interface debonding, and ductile deformation of “sandwich” Al-steel mesh-Al layer are the main reasons for improving the toughness and work-of-fracture of laminated composites. Low-velocity impact results suggest that the Al₂O₃/Al-steel mesh-Al laminated composites have good impact resistance.

Key words: alumina, Al-steel, hot pressing, laminated composites, mechanical properties, low-velocity impact

中图分类号:

TQ174

白明敏, 李伟信, 李艳辉, 赵威, 饶平根. 热压烧结Al₂O₃/Al-steel Mesh-Al 层状复合材料的制备和性能[J]. 无机材料学报, 2014, 29(12): 1339-1344.

BAI Ming-Min, LI Wei-Xin, LI Yan-Hui, ZHAO Wei, RAO Ping-Gen. Preparation and Properties of Hot-pressed Al₂O₃/Al-steel Mesh-Al Laminated Composites[J]. Journal of Inorganic Materials, 2014, 29(12): 1339-1344.

图/表 10

Table 1 Properties of steel meshes and Al foil

Samples	Thickness/µm	Diameter of steel wire/µm	Tensile strength/MPa	Melting temperature/℃
60# steel mesh	222	146	78.8±4.2	1500-1600
200#steel mesh	122	85	116.2±9.2
400#steel mesh	103	59	107.0±4.1
Al foil	100	-	59.7±5.5	660

Fig. 1 Schematic illustration of the laminated composites

Fig. 2 Optical micrograph and SEM images of the laminated composites (a) Optical micrograph image; (b) Mesoscale image; (c) Interface of Al2O3/Al; (d) Interface of Al/steel

Fig. 3 EDS surface analysis of metal interlayer

Table 2 Mechanical properties of laminated composites

Samples	Bending strength σ/MPa	Fracture toughness K_Ic/(MPa·m^1/2)	Work-of-fracture γ/(J·m^-2)	Bond strength BS/MPa
Al₂O₃	300±24	-	13±3	-
A/Al-60-Al	241.3±6.6	14.1±1.1	3066.5±395.5	22.3±1.9
A/Al-200-Al	254.2±10.7	15.5±1.4	3844.4±406.2	43.9±1.5
A/Al-400-Al	255.4±9.1	12.8±1.3	2959.2±224.3	22.9±1.2

Fig. 4 Load-displacement curves in 3-point bend test of A/Al-60-Al, A/Al-200-Al and A/Al-400-Al

Fig. 5 Single macroscopic crack propagating in notched lamin-ated composite during three-point bending test

Table 3 Impact parameters for impacted specimens

Samples	Impact energy/J	Peak load, P_i/kN	Time to peak load, T_i/ms	Deflection at peak load, D_i/mm	Absorbed energy at peak load, E_i/J	Absorbed energy, E/J	Damage situation
A/Al-60-Al	15	6.23	0.22	0.44	1.41	13.5	Penetrated
A/Al-200-Al	15	6.47	1.77	2.58	12.20	15.0	Not penetrated
A/Al-400-Al	15	7.07	0.31	0.62	1.88	15.0	Not penetrated

Fig. 6 Photos of the top, bottom surface and optical micrographs of cross-section of samples impacted at 15 J (a) A/Al-60-Al (b) A/Al-200-Al

Fig. 7 Load vs time and energy vs time for A/Al-60-Al and A/Al-200-Al specimens impacted at 15 J

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热压烧结Al₂O₃/Al-steel Mesh-Al 层状复合材料的制备和性能

Preparation and Properties of Hot-pressed Al₂O₃/Al-steel Mesh-Al Laminated Composites

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