钙硅比以及不同含铝材料对水合陶瓷体系抗高温性能的影响

doi:10.11896/cldb.25020044

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Abstract The CaO-SiO₂-Al₂O₃ hydroceramic system has broad application prospects in well cementing for deep and ultra-deep wells. However, the Ca/Si ratio and the use of different aluminum-containing materials significantly influence the high-temperature resistance of the hydroceramic system. This study investigated the effects of α-Al₂O₃, nano-activated alumina, and two different compositions of calcium aluminate powder on the mechanical properties, pore structure, and mineral composition of hydroceramic systems with different Ca/Si ratios (The density was 1.65 g/cm³) after high-temperature curing (cured under 240 ℃/50 MPa for 2, 30, and 90 days). The results indicated that when the Ca/Si ratio was 0.5, the addition of α-Al₂O₃ decreased the system's high-temperature stability. The simultaneous addition of α-Al₂O₃ and nano-activated alumina significantly decreased the system's early porosity (at 2 days), but it also led to a rapid increase in porosity and a decline in long-term strength in later stages. Replacing alumina with calcium aluminate significantly decreased the system's mechanical properties. When the Ca/Si ratio was 1, the addition of α-Al₂O₃ somewhat enhanced the early mechanical properties of the system. The simultaneous addition of α-Al₂O₃ and nano-activated alumina further enhanced the system's mechanical properties. However, the long-term strength of these two systems significantly decreased at 90 days. Replacing alumina with calcium aluminate noticeably decreased the pore size of the system and further enhanced mechanical properties (the maximum compressive strength reaching up to 22.9 MPa) and long-term stability. The composition of calcium aluminate had a certain impact on the performance of the hydroceramic system, with calcium aluminate powder containing more CaO·Al₂O₃ and 2CaO·Al₂O₃·SiO₂ showing better optimization effects on the high-temperature resistance of the hydroceramic system.

Key words： hydroceramic system aluminum-containing material mechanical property pore structure mineral composition

Published: 10 October 2025 Online: 2025-09-24

CLC number:

TE256

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	Articles by authors
	PANG Xueyu
	WANG Chuangchuang
	SUN Lijun
	HUANG Xianbin
	LYU Kaihe
	SUN Jinsheng

Cite this article:

PANG Xueyu,WANG Chuangchuang,SUN Lijun, et al. Effect of the Ca/Si Ratio and Different Aluminum-containing Materials on the High-temperature Resistance of the Hydroceramic System[J]. Materials Reports, 2025, 39(19): 25020044-8.

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https://www.mater-rep.com/EN/10.11896/cldb.25020044 OR https://www.mater-rep.com/EN/Y2025/V39/I19/25020044

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