Preparation and Neutron Shielding Properties of Fiberglass Based Thermal Insulating Porous Ceramics

doi:10.11901/1005.3093.2023.294

Chinese Journal of Materials Research

2024, Vol. 38

Issue (6): 471-480 DOI: 10.11901/1005.3093.2023.294

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Preparation and Neutron Shielding Properties of Fiberglass Based Thermal Insulating Porous Ceramics

WU Qianfang¹, HE Qun¹, CHANG Bing¹, QUAN Yuxin¹, HU Jingwen¹, LI Saisai¹(

), CAO Yingnan²

^1.School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China
^2.Sintosteel Luoyang Refractory Research Institute, Luoyang 471039, China

Cite this article:

WU Qianfang, HE Qun, CHANG Bing, QUAN Yuxin, HU Jingwen, LI Saisai, CAO Yingnan. Preparation and Neutron Shielding Properties of Fiberglass Based Thermal Insulating Porous Ceramics. Chinese Journal of Materials Research, 2024, 38(6): 471-480.

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Abstract

Fiberglass based porous ceramics were prepared via foam-gelcasting process using 48.75% (mass fraction) fiberglass and 16.25% (mass fraction) glass particles as main raw materials, 0.25% (mass fraction) Isobam-104 as dispersant, 0.1% (mass fraction) sodium carboxymethyl cellulose as foam stabilizer, 0.6% (mass fraction) sodium dodecyl sulfate as foaming agent, and gadolinium oxide as neutron shielding agent. The effects of heat treatment temperature on the phase composition, microstructure, pore structure, linear shrinkage, flexural strength, compressive strength, thermal conductivity of and porosity of the porous ceramics, and the effect of gadolinium oxide content on the physical properties, microstructure, neutron shielding performance and thermal conductivity of the porous ceramic composites were investigated. The results show that the heat treatment temperature had a great influence on the microstructure and mechanical properties of the porous ceramics. As the temperature increased from 700^oC to 800^oC, the size and the number of pores (open pores and window pores) decreased gradually, the pore walls became thick and dense, the flexural and compressive strength of the porous ceramics increased from 0.3 MPa and 0.75 MPa to 5.1 MPa and 10.7 MPa, respectively, while the thermal conductivity increased from 0.075 W/(m·K) to 0.28 W/(m·K). After being treated at 750^oC, the physical properties of porous ceramics were excellent, namely the flexural strength, compressive strength and porosity were 1.4 MPa, 2.1 MPa, 79.8% (mass fraction) respectively and the thermal conductivity was as low as 0.11 W/(m·K). With the increase of gadolinium oxide content from 0 to 6% (mass fraction), the porosity and mechanical properties of porous ceramic composites decrease, but their neutron shielding properties are significantly improved. When added 6.0% (mass fraction) gadolinium oxide, the neutron shielding rate and the thermal neutron shielding rate of the as-prepared porous ceramics were 50.8% and 82.9% (mass fraction) respectively, but the thermal conductivity was still 0.11 W/(m·K). Compared with traditional shielding materials, the glass fiber based insulating porous ceramic composite prepared in this work has excellent mechanical properties, as well as excellent thermal insulation and neutron shielding properties.

Key words: inorganic non-metallic materials porous ceramics fiberglass gadolinium oxide shielding properties

Received: 15 June 2023

ZTFLH:

TB32

Fund: Natural Science Foundation of Anhui Provincial Education Department(KJ2020A0270);Open Foundation of the State Key Laboratory of Advanced Refractories(SKLAR202102);Open Project Program of Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Anhui University of Technology) Ministry of Education(JKF21-04)

Corresponding Authors: LI Saisai, Tel: 13627290264, E-mail: lisaisai@ahut.edu.cn

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	WU Qianfang
	HE Qun
	CHANG Bing
	QUAN Yuxin
	HU Jingwen
	LI Saisai
	CAO Yingnan

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.294 OR https://www.cjmr.org/EN/Y2024/V38/I6/471

Fig.1 Particle size distribution of glass particles

Table 1 Chemical composition of glass fibers and glass particles (mass fraction, %)

Fig.2 SEM micrographs of the fiberglass and glass particles (a) fiberglass, (b) glass particles

Fig.3 XRD patterns of porous ceramics prepared at different heat treatment temperatures

Fig.4 SEM images of porous ceramics prepared at different heat treatment temperatures (a) 700^oC, (b) 725^oC, (c) 750^oC, (d) 775^oC, (a) 800^oC

Fig.5 Macrostructure, microstructure and pore size distribution of porous ceramics prepared at different heat treatment temperatures (a1~a3) 700^oC, (b1~b3) 725^oC, (c1~c3) 750^oC, (d1~d3) 775^oC; (e1~e3) 800^oC

Fig.6 Linear shrinkage of porous ceramics prepared at different heat treatment temperatures

Fig.7 Porosity, bulk density, flexural and compressive strength of porous ceramics prepared at different heat treatment temperatures (a) porosity and bulk density, (b) flexural strength and compressive strength

Fig.8 Thermal conductivity of porous ceramics prepared at different heat treatment temperatures

Table 2 Thermal conductivity of porous ceramics prepared in this work and their counterparts reported

Fig.9 XRD patterns of porous ceramics prepared with different gadolinium oxide contents

Fig.10 Porosity, bulk density, flexural and compressive strength of composites prepared with different gadolinium oxide contents (a) porosity and bulk density, (b) flexural strength and compressive strength

Fig.11 Microstructure of composites with different gadolinium oxide contents (a) 1%, (b) 2%, (c)3%, (d) 4%, (d) 5%, (e) 6%

Fig.12 Pore structure of composites with different gadolinium oxide contents: (a1, a2) 1%, (b1, b2) 2%, (c1, c2) 3%, (d1, d2)4%; (e1, e2) 5%, (f1, f2) 6%

Fig.13 Neutron and thermal neutron shielding efficiency of composites prepared with different gadolinium oxide contents

Fig.14 Thermal conductivity of composites prepared with different gadolinium oxide contents

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