残余应力对涂覆Al2O3涂层的ZrO2陶瓷的强度和裂纹扩展阻力的影响

doi:10.15541/jim20210412

无机材料学报 ›› 2022, Vol. 37 ›› Issue (4): 467-472.DOI: 10.15541/jim20210412

• 研究快报 • 上一篇

残余应力对涂覆Al₂O₃涂层的ZrO₂陶瓷的强度和裂纹扩展阻力的影响

李海燕¹^,²(), 郝鸿渐¹^,², 田远¹^,², 汪长安³, 包亦望¹^,²(), 万德田¹^,²()

1.中国建材检验认证集团股份有限公司, 北京 100024
2.中国建筑材料科学研究总院, 绿色建材国家重点实验室, 北京 100024
3.清华大学材料学院, 新型陶瓷与精细工艺国家重点实验室, 北京 100084

收稿日期:2021-07-01 修回日期:2021-07-30 出版日期:2021-07-31 网络出版日期:2021-07-20
通讯作者: 包亦望, 教授. E-mail: ywbao@ctc.ac.cn;
万德田, 教授. E-mail: dtwan@ctc.ac.cn
作者简介:李海燕(1989–), 女, 博士. E-mail: lihaiyan@ctc.ac.cn

Effects of Residual Stresses on Strength and Crack Resistance in ZrO₂ Ceramics with Alumina Coating

LI Haiyan¹^,²(), HAO Hongjian¹^,², TIAN Yuan¹^,², WANG Changan³, BAO Yiwang¹^,²(), WAN Detian¹^,²()

1. China Building Material Test & Certification Group Co., Ltd, Beijing 100024, China
2. State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China
3. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Received:2021-07-01 Revised:2021-07-30 Published:2021-07-31 Online:2021-07-20
Contact: BAO Yiwang, professor. E-mail: ywbao@ctc.ac.cn;
WAN Detian, professor. E-mail: dtwan@ctc.ac.cn
About author:LI Haiyan(1989–), PhD. E-mail: lihaiyan@ctc.ac.cn
Supported by:
National Natural Science Foundation of China(52032011);State Key Laboratory of New Ceramic and Fine Processing Tsinghua University(KF 202007);Youth Fund of China Building Materials Academy(ZD-16)

摘要/Abstract

摘要：

本研究在ZrO₂基体表面涂覆一薄层Al₂O₃涂层, 利用基体与涂层之间热膨胀系数不匹配, 在Al₂O₃-ZrO₂预应力陶瓷(简称A_CZ_S预应力陶瓷)表层引入压应力。采用维氏压痕法评价残余应力对A_CZ_S预应力陶瓷的表层和基体中裂纹扩展阻力的影响。理论分析结合实验结果表明: 表层的压应力使得A_CZ_S预应力陶瓷的裂纹扩展阻力增大, 最终导致强度和损伤容限提高; 且A_CZ_S预应力陶瓷表层的压应力和裂纹扩展阻力随着基体截面积与涂层截面积比值的增加而增大。当ZrO₂基体表层的Al₂O₃涂层厚度为40 μm时, 表层压应力使A_CZ_S预应力陶瓷的弯曲强度达到(1207±20) MPa, 相比于同种工艺下制备的ZrO₂陶瓷强度提高了32%, 同时也是Al₂O₃强度的3倍。此外, A_CZ_S预应力陶瓷也表现出很好的抗热震性能。

关键词: Al₂O₃-ZrO₂预应力陶瓷, 压应力, 弯曲强度, 损伤容限

Abstract:

By covering a thin Al₂O₃ coating on ZrO₂ substrate, compressive stress caused by the mismatch of thermal expansion coefficients between the coating and substrate was introduced in the surface layer of Al₂O₃-ZrO₂ pre-stressed ceramics (marked as A_CZ_S pre-stressed ceramics). Vickers indentation test was carried out to check the crack resistance in the surface layer and substrate influenced by the residual stresses. The enhancement of the crack resistance in surface layer results in a high flexural strength and excellent damage tolerance. Both theoretical analysis and experimental results show that the compressive stress and crack resistance in the surface layer increase with the increasing ratio of the cross-sectional area of ZrO₂ substrate to Al₂O₃ coating. Due to the residual compressive stress existing in Al₂O₃ coating, a high flexural strength of (1207±20) MPa was measured for ZrO₂ specimens coated with 40 μm Al₂O₃. The flexural strength is 32% higher than that of monolithic ZrO₂, and about triple of the value of Al₂O₃. Meanwhile, compared to ZrO₂, the A_CZ_S pre-stressed ceramics exhibit superior thermal shock resistance.

Key words: Al₂O₃-ZrO₂ pre-stressed ceramics, compressive stress, flexural strength, damage tolerance

中图分类号:

TQ174

李海燕, 郝鸿渐, 田远, 汪长安, 包亦望, 万德田. 残余应力对涂覆Al₂O₃涂层的ZrO₂陶瓷的强度和裂纹扩展阻力的影响[J]. 无机材料学报, 2022, 37(4): 467-472.

LI Haiyan, HAO Hongjian, TIAN Yuan, WANG Changan, BAO Yiwang, WAN Detian. Effects of Residual Stresses on Strength and Crack Resistance in ZrO₂ Ceramics with Alumina Coating[J]. Journal of Inorganic Materials, 2022, 37(4): 467-472.

图/表 8

Fig. 1 (a) Schematic diagram of the ACZS pre-stressed ceramics; (b) SEM image of interface between ZrO2 substrate and Al2O3 coating

Fig. 2 (a) Typical Vickers indentation of ZrO2 ceramics; (b) Optical photograph of the indentation morphology for ZrO2 ceramics without residual stress

Fig. 3 Optical photographs of the indentation morphologies for ACZS pre-stressed ceramics with different ratios of the cross-sectional areas, showing the effects of the compressive stresses in the coating and tensile stresses in the substrate

Table 1 Parameters used in formulas and the results of the experiment and simulation

		Elasticity modulus, E/GPa	p/N	a/μm	c/μm	H_V/GPa	K_I,_IFR/(MPa·m^1/2)
ZrO₂	ZrO₂	220	19.62	26.80	35.20	12.66	9.10
A_CZ_S with 40 μm coating	Al₂O₃-40	350	4.91	11.25	47.50	17.98	1.52
A_CZ_S with 40 μm coating	ZrO₂-40	220	19.62	26.16	36.88	13.28	8.33
A_CZ_S with 30 μm coating	Al₂O₃-30	350	4.91	11.09	44.38	18.49	1.67
A_CZ_S with 30 μm coating	ZrO₂-30	220	19.62	26.08	36.05	13.37	8.59
A_CZ_S with 20 μm coating	Al₂O₃-20	350	4.91	10.94	25.00	19.02	3.89
A_CZ_S with 20 μm coating	ZrO₂-20	220	19.62	26.01	35.87	13.44	8.64

Fig. 4 Stress state and Vickers indentation of ACZS pre-stressed ceramics hs and hc: the thicknesses of substrate and coating

Fig. 5 Calculated residual stress in the Al2O3 coating and ZrO2 substrate of ACZS pre-stressed ceramics, as the function of the ratio of cross-sectional area of ZrO2 substrate to Al2O3 coating

Fig. 6 SEM images of the fracture surfaces for monolithic ZrO2 ceramics (a, b) and ZrO2 substrate of ACZS pre-stressed ceramics (c, d) fabricated by the hot-pressing sintering method

Fig. 7 Residual strength of ACZS pre-stressed ceramics and ZrO2 ceramics, after quenching at different thermal shock temperatures

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残余应力对涂覆Al₂O₃涂层的ZrO₂陶瓷的强度和裂纹扩展阻力的影响

Effects of Residual Stresses on Strength and Crack Resistance in ZrO₂ Ceramics with Alumina Coating

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