SrAl2Si2O8增强BN陶瓷的力学性能及抗热震性能

doi:10.15541/jim20240091

无机材料学报 ›› 2024, Vol. 39 ›› Issue (10): 1182-1188.DOI: 10.15541/jim20240091 CSTR: 32189.14.10.15541/jim20240091

• 研究快报 • 上一篇

SrAl₂Si₂O₈增强BN陶瓷的力学性能及抗热震性能

王博¹^,²(), 蔡德龙¹(), 朱启帅²^,³, 李达鑫², 杨治华², 段小明², 李雅楠⁴, 王轩⁵, 贾德昌²(), 周玉²^,⁶

1.哈尔滨工程大学材料科学与化学工程学院, 黑龙江省先进纳米材料联合实验室, 哈尔滨 150001
2.哈尔滨工业大学材料科学与工程学院, 先进结构功能一体化材料与绿色制造技术工业和信息化部重点实验室, 哈尔滨 150001
3.华润水泥技术研发有限公司, 广州 510000
4.陆军装备部驻北京地区第一军代处, 北京 100072
5.中国航天科工集团第四研究院第四总体设计部, 北京 100048
6.哈尔滨工业大学(深圳) 材料科学与工程学院，深圳 518055

收稿日期:2024-03-03 修回日期:2024-05-09 出版日期:2024-10-20 网络出版日期:2024-05-16
通讯作者: 蔡德龙, 副教授. E-mail: dlcai@hit.edu.cn;
贾德昌, 教授. E-mail: dcjia@hit.edu.cn
作者简介:王博(1996-), 男, 博士研究生. E-mail: bowang6600@126.com

Mechanical Properties and Thermal Shock Resistance of SrAl₂Si₂O₈ Reinforced BN Ceramic Composites

WANG Bo¹^,²(), CAI Delong¹(), ZHU Qishuai²^,³, LI Daxin², YANG Zhihua², DUAN Xiaoming², LI Yanan⁴, WANG Xuan⁵, JIA Dechang²(), ZHOU Yu²^,⁶

1. International Joint Laboratory of Advanced Nanomaterials of Heilongjiang Province, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
2. Key Laboratory of Advanced Structural- Functional Integration Materials, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
3. China Resources Cement Technology R&D Co., Ltd, Guangzhou 510000, China
4. The First Military Representative Office of the Army Equipment Department in Beijing, Beijing 100072, China
5. The Fourth System Design Department, Fourth Academy, China Aerospace Science and Industry Corporation Limited, Beijing 100048, China
6. School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China

Received:2024-03-03 Revised:2024-05-09 Published:2024-10-20 Online:2024-05-16
Contact: CAI Delong, associate professor. E-mail: dlcai@hit.edu.cn;
JIA Dechang, professor. E-mail: dcjia@hit.edu.cn
About author:WANG Bo (1996-), male, PhD candidate. E-mail: bowang6600@126.com
Supported by:
National Natural Science Foundation of China(52072088);National Natural Science Foundation of China(52072089);Natural Science Foundation of Heilongjiang Province(LH2023E061);Scientific and Technological Innovation Leading Talent of Harbin Manufacturing(2022CXRCCG001);Fundamental Research Funds for the Central Universities(3072023CFJ1003)

摘要/Abstract

摘要：

h-BN陶瓷以其良好的热稳定性和优异的介电性能而成为高超声速飞行器防热透波部件的优异材料, 然而h-BN陶瓷烧结致密化相对困难, 且力学性能较差。SrAl₂Si₂O₈ (SAS)具有较低的熔点和较高的强度, 将其引入到h-BN陶瓷中能够起到促进烧结和补强增韧的作用。本研究以h-BN、SrCO₃、Al₂O₃和SiO₂为原料, 采用热压烧结制备了BN-SAS复相陶瓷, 研究了烧结压力对复相陶瓷显微组织结构、力学性能和热学性能的影响规律, 并评价了BN-SAS复相陶瓷的抗热震性能。结果表明,热压烧结制备的BN-SAS复相陶瓷的物相主要为六方氮化硼和六方锶长石。随着烧结压力增大, 复相陶瓷的致密度增加, 力学性能呈现先增大后略有降低的趋势。在20 MPa烧结压力下制备的复相陶瓷的力学性能最优, 其抗弯强度和断裂韧性分别为(138±4) MPa和(1.84±0.05) MPa·m^1/2。10 MPa烧结压力下制备的BN-SAS复相陶瓷具有较低的热膨胀系数, 在200~1200 ℃范围内的平均热膨胀系数为 2.96×10^-6 K^-1。20 MPa烧结压力下制备的复相陶瓷的热导率较高, 室温~1000 ℃时热导率变化范围为12.42~ 28.42 W·m^-1·K^-1。BN-SAS复相陶瓷表现出良好的抗热震性能, 经600~1400 ℃温差的热震实验后, 其残余抗弯强度先增大后迅速降低。复相陶瓷的残余抗弯强度在热震温差为800 ℃时达到最高, 残余强度保持率为101%。随着热震温差逐渐增大, 陶瓷表面的氧化程度逐步加剧, 热应力引起的裂纹逐渐增多。

关键词: BN基复相陶瓷, 热压烧结, 力学性能, 抗热震性, 服役可靠性

Abstract:

Hexagonal boron nitride (h-BN) ceramics have become exceptional materials for heat-resistant components in hypersonic vehicles, owing to their superior thermal stability and excellent dielectric properties. However, their densification during sintering still poses challenges for researchers, and their mechanical properties are rather unsatisfactory. In this study, SrAl₂Si₂O₈ (SAS), with low melting point and high strength, was introduced into the h-BN ceramics to facilitate the sintering and reinforce the strength and toughness. Then, BN-SAS ceramic composites were fabricated via hot press sintering using h-BN, SrCO₃, Al₂O₃, and SiO₂ as raw materials, and effects of sintering pressure on their microstructure, mechanical property, and thermal property were investigated. The thermal shock resistance of BN-SAS ceramic composites was evaluated. Results show that phases of as-preparedBN-SAS ceramic composites are h-BN and h-SrAl₂Si₂O₈. With the increase of sintering pressure, the composites’ densities increase, and the mechanical properties shew a rising trend followed by a slight decline. At a sintering pressure of 20 MPa, their bending strength and fracture toughness are (138±4) MPa and (1.84±0.05) MPa·m^1/2, respectively. Composites sintered at 10 MPa exhibit a low coefficient of thermal expansion, with an average of 2.96×10^-6 K^-1in the temperature range from 200 to 1200 ℃. The BN-SAS ceramic composites prepared at 20 MPa display higher thermal conductivity from 12.42 to 28.42 W·m^-1·K^-1within the temperature range from room temperature to 1000 ℃. Notably, BN-SAS composites exhibit remarkable thermal shock resistance, with residual bending strength peaking and subsequently declining sharply under a thermal shock temperature difference ranging from 600 to 1400 ℃. The maximum residual bending strength is recorded at a temperature difference of 800 ℃, with a residual strength retention rate of 101%. As the thermal shock temperature difference increase, the degree of oxidation on the ceramic surface and cracks due to thermal stress are also increased gradually.

Key words: BN matrix composite, hot-press sintering, mechanical property, thermal shock resistance, service reliability

中图分类号:

TQ174

王博, 蔡德龙, 朱启帅, 李达鑫, 杨治华, 段小明, 李雅楠, 王轩, 贾德昌, 周玉. SrAl₂Si₂O₈增强BN陶瓷的力学性能及抗热震性能[J]. 无机材料学报, 2024, 39(10): 1182-1188.

WANG Bo, CAI Delong, ZHU Qishuai, LI Daxin, YANG Zhihua, DUAN Xiaoming, LI Yanan, WANG Xuan, JIA Dechang, ZHOU Yu. Mechanical Properties and Thermal Shock Resistance of SrAl₂Si₂O₈ Reinforced BN Ceramic Composites[J]. Journal of Inorganic Materials, 2024, 39(10): 1182-1188.

图/表 9

Fig. 1 Flow chart for the preparation of BN-SAS ceramic composites by hot-press sintering

Table 1 Density, bending strength and fracture toughness of BN-SAS ceramic composites

Sintering pressure/ MPa	Density/ (g·cm^-3)	Bending strength/ MPa	Fracture toughness/ (MPa·m^1/2)
10	1.90	87±5	1.33±0.04
20	2.25	138±4	1.84±0.05
30	2.33	136±11	1.50±0.24

Fig. 2 XRD patterns of BN-SAS ceramic composites sintered at different pressures

Fig. 3 HRTEM and TEM characterization of BN-SAS ceramic composites sintered at 10 MPa (a) HRTEM image; (b) Inverse FFT image of area A in figure (a); (c) SAED pattern of h-BN; (d) TEM image of BN-SAS ceramic composites; (e-j) Elemental analysis of the figure (d); (e) B; (f) N; (g) O; (h) Sr; (i) Al; (j) Si

Fig. 4 Fracture microstructures of BN-SAS ceramic composites sintered at different pressures (a) 10 MPa; (b) 20 MPa; (c) 30 MPa

Fig. 5 Thermal properties of BN-SAS ceramic composites sintered at different pressures (a) Thermal expansion rate with inset showing the average CTE (α); (b) Thermal conductivity

Table 2 Properties of the BN-SAS ceramic composites

Sintering pressure/MPa	Bending strength/MPa	Fracture toughness/ (MPa·m^1/2)	Young's modulus/GPa	Average CTE/ (×10⁻⁶, K⁻¹)	λ/( W·m^-1·K^-1, 1000 ℃)	R/℃	R^Ⅳ/μm
10	87±5	1.33±0.04	48.47	2.96	14.70	$609(1-\nu )$	$230/(1-\nu )$
20	138±4	1.84±0.05	67.83	3.33	12.42	$613(1-\nu )$	$177/(1-\nu )$
30	136±11	1.50±0.24	66.94	5.04	5.72	$404(1-\nu )$	$122/(1-\nu )$

Fig. 6 Residual bending strength and residual strength rate of BN-SAS composites sintered at 20 MPa as a function of thermal shock temperature difference

Fig. 7 Micrographs of surfaces and fracture edges of BN-SAS ceramic composites sintered at 20 MPa after thermal shock with different temperature differences (a) 600 ℃; (b) 800 ℃; (c) 1000 ℃; (d) 1200 ℃; (e) 1400 ℃; (f) Fracture edge morphology under thermal shock temperature difference of 1400 ℃

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SrAl₂Si₂O₈增强BN陶瓷的力学性能及抗热震性能

Mechanical Properties and Thermal Shock Resistance of SrAl₂Si₂O₈ Reinforced BN Ceramic Composites

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