Abstract
A novel approach is used for fabricating steel slag foam ceramics based on the particle‐stabilized foaming method. In this work, steel slag was used as the raw material and propyl gallate (PG) was used as the surface modifier. For the first time, steel slag ceramic foams were successfully fabricated based on particle‐stabilized foams. The results show that the stability of the ceramic foams was closely related to the pH value and PG concentration. The porosity and compressive strength could be controlled by changing the solid loading of steel slag and sintering temperature. The porosity of steel slag foam ceramics ranged from 85.6% to 62.53%, and the compressive strength was from 1.74 MPa to 10.42 MPa. The thermal conductivity of steel slag foam ceramics was only 0.067 W (m·K)−1, which shows that it could be used as a thermal insulation material.
Highlights
Foam ceramics play an important role in high-technology fields and cellular structures composed of three-dimensional networks. e physical and chemical properties of foam ceramics can be adjusted by changing phase composition, the proportion of gas-solid phase, and the sintering temperature
Similar to most oxide ceramic powders, they generate hydroxyl groups on the surface of particles; steel slag particles allow the formation of hydroxyl groups due to the unsaturated bonds of oxygen atoms exposed on the surface of steel slag particles, providing a large number of anchoring groups for the adsorption of propyl gallate (PG)
Shortchain amphiphile PG is attached around the steel slag particles; the steel slag particles are closely aggregated at the air/liquid interfaces closely and form the dense particle layers around the bubbles to obtain stable wet foams. e foam loses water at normal temperature and pressure and eventually develops into dry foams
Summary
Foam ceramics play an important role in high-technology fields and cellular structures composed of three-dimensional networks. e physical and chemical properties of foam ceramics can be adjusted by changing phase composition, the proportion of gas-solid phase, and the sintering temperature. Foam ceramics play an important role in high-technology fields and cellular structures composed of three-dimensional networks. Foam ceramics display low bulk density, excellent thermal conductive and acoustic insulation, high specific area, and excellent resistance [1]. Based on these properties, foam ceramics can be extensively applied in different fields, such as catalysis carriers, filtration material, biomaterials, thermal insulators, thermal barrier coatings, and soundproof materials [2,3,4,5,6]. Rainer et al [11] reported the application of in situ foaming technique for the preparation of foam ceramics
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