Al2O3/Steel-epoxy层状复合材料的制备和性能

doi:10.3724/SP.J.1077.2013.12709

摘要/Abstract

摘要：

采用环氧树脂胶黏剂作为粘结剂, 通过一种简单的模压方法, 在5 MPa压力下常温固化, 制备了一系列Al₂O₃/steel-epoxy层状复合陶瓷材料。结果显示, Al₂O₃/epoxy界面和steel/epoxy界面结合紧密。相比于氧化铝薄片, Al₂O₃/steel-epoxy层状复合陶瓷材料强度差别不大, 但具有更高的断裂韧性、冲击韧性和断裂吸收能。裂纹扩展分析认为层状复合材料断裂韧性和能量吸收的提高主要得益于裂纹尖端钝化和捕获、裂纹桥连、层间脱粘和steel-epoxy层的塑性变形等机制。

关键词: 层状复合材料, 氧化铝, 界面, 钢丝-环氧树脂, 机械性能, 韧化机制

Abstract:

A series of Al₂O₃/steel-epoxy laminated composites were prepared by using epoxy resin adhesive as binder via a simple process in a leaky mould at a pressure of 5 MPa. The results indicate that the interfaces of Al₂O₃/epoxy and steel/epoxy are joined tightly, and the laminated composites have much higher fracture toughness, impact toughness and energy consumption than the Al₂O₃monolith, as well as having a close strength to Al₂O₃. The crack propagation behavior indicates that the improvement of toughness and energy consumption attribute to the mechanisms of crack blunting and arresting, crack bridging, interface debonding, ductile deformation of steel-epoxy mesh layer.

Key words: laminated composites, alumina, interfaces, steel-epoxy, mechanical properties, toughening mechanism

中图分类号:

TQ174

李伟信, 白明敏, 陆颖, 饶平根. Al₂O₃/Steel-epoxy层状复合材料的制备和性能[J]. 无机材料学报, 2013, 28(4): 453-459.

LI Wei-Xin, BAI Ming-Min, LU Ying, RAO Ping-Gen. Preparation and Properties of Al₂O₃/Steel-epoxy Laminated Composites[J]. Journal of Inorganic Materials, 2013, 28(4): 453-459.

图/表 9

Fig. 1 Preparation process of laminated composites

Fig. 2 Specimens dimension and loading pattern during fracture toughness test

Fig. 3 SEM images of the laminated composites

Fig. 4 (a) The typical load-displacement curve of Al2O3/steel-epoxy laminated composites; (b) η vs mesh number of steel mesh

Fig. 5 The earlier parts of the load-displacement curves and the energy consumption for A/200, A/150 and A/120

Fig. 6 The optical micrograph showing the corresponding crack propagation

Table 1 Mechanical properties of Al2O3 monolith and various laminated composites

Samples	Density, ρ/(g•cm^-3)	Young modulus, E/GPa	Bending strength, σ/MPa	Fracture toughness, K_Ic/(MPa·m^1/2)	Energy consumption			Impact toughness, α_k/(kJ·m^-2)
Samples	Density, ρ/(g•cm^-3)	Young modulus, E/GPa	Bending strength, σ/MPa	Fracture toughness, K_Ic/(MPa·m^1/2)	W_a*/(J·m^-2)	W/(J·m^-2)		Impact toughness, α_k/(kJ·m^-2)
Al₂O₃	3.74	360	300±44	-	-		0	-
A/A	3.65	188	199±16	10.1±1.2	1500±200		0	4.2±0.5
A/200	3.57	162	303±16	14.5±0.6	3000±300		6087±424	8.5±0.9
A/150	3.52	148	286±28	14.2±0.5	2600±260		5740±335	9.1±0.9
A/120	3.43	129	260±30	14.3±0.6	2334±280		5508±387	10.6±1.0

Fig. 7 Influences of steel mesh on the mechanical properties of laminated composites

Fig. 8 Crack initiation and propagation in notched laminated composite during three-point bending test

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Al₂O₃/Steel-epoxy层状复合材料的制备和性能

Preparation and Properties of Al₂O₃/Steel-epoxy Laminated Composites

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