Abstract
A novel sintered cutting stainless steel fiber felt with internal channels (SCSSFFC) composed of a stainless-steel fiber skeleton, three-dimensional interconnected porous structure and multiple circular microchannels is developed. SCSSFFC has a jagged and rough surface morphology and possesses a high specific surface area, which is approximately 2.4 times larger than that of the sintered bundle-drawing stainless steel fiber felt with internal channels (SBDSSFFC) and is expected to enhance adhesive strength. The sol-gel and wet impregnation methods are adopted to prepare SCSSFFC with an Al2O3 coating (SCSSFFC/Al2O3). The adhesive strength of SCSSFFC/Al2O3 is investigated using ultrasonic vibration and thermal shock tests. The experimental results indicate that the weight loss rate of the Al2O3 coating has a 4.2% and 8.42% reduction compared with those of SBDSSFFCs based on ultrasonic vibration and thermal shock tests. In addition, the permeability of SCSSFFC/Al2O3 is investigated based on forced liquid flow tests. The experimental results show that the permeability and inertial coefficients of SCSSFFC/Al2O3 are mainly affected by the coating rate, porosity and open ratio; however, the internal microchannel diameter has little influence. It is also found that SCSSFFC/Al2O3 yields superior permeability, as well as inertial coefficients compared with those of other porous materials reported in the literature.
Highlights
Volatile organic compounds (VOCs) emitted from petrochemical and chemical industries, printing presses and transport vehicles have been a major source of air pollution [1,2]
It is found that SCSSFFC/Al2 O3 yields superior permeability, as well as inertial coefficients compared with those of other porous materials reported in the literature
In ultrasonic ultrasonic vibration vibration and shock tests, the weight loss rate of a sample is used to evaluate the adhesive strength of the Al2O3 coating to SCSSFFC which is defined by φ= (m1 − m2)/m1 (4)
Summary
Volatile organic compounds (VOCs) emitted from petrochemical and chemical industries, printing presses and transport vehicles have been a major source of air pollution [1,2]. Substantial attention has been paid to metallic supports, especially those made of stainless steel, because of their good corrosion resistance, privileged mechanical strength, high thermal conductivity and low manufacturing cost [10,11]. Many other attempts have been tried, such as the wet oxidation process [18,19], chemical vapor deposition [20], anodic oxidation [21,22], thermal oxidation [2] and wet etching [23] These treatment methods are time consuming and not cost effective, which restricts their practical applications. It is of urgency to develop an effective and promising preparation technology to increase the adhesive strength of Al2 O3 coatings by improving the superficial roughness of metallic supports. A sintered cutting stainless steel fiber felt with internal channels (SCSSFFC) is developed based on the bifurcating chip cutting method. The influences of the Al2 O3 coating rate and the structural parameters of the SCSSFFC on the permeability and inertial coefficient of SCSSFFC/Al2 O3 are investigated experimentally and the modified correlations are put forward to predict the permeability and inertial coefficient of SCSSFFC/Al2 O3
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