Nanoindentation and SEM/EDX characterization of the geopolymer-to-steel interfacial transition zone for a reactive porcelain enamel coating

Allison, P. G.; Weiss, Charles; Moser, Robert D.; Diaz, Alfredo J.; Rivera, O.G.; Holton, Stacy S.

doi:10.1016/j.compositesb.2015.03.011

Cited by 48 publications

(14 citation statements)

References 26 publications

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“…With the rise of Si/Al, the amount of SiO 2 in the composites decreased gradually. The results of XRD also indicated that the stainless steel mesh and chromium powder were not involved in the reaction with geopolymer matrix [21]. Fig.…”

Section: Characterizationmentioning

confidence: 89%

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The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites

Yuan

Jia

2017

MATEC Web Conf.

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Abstract. In this study, a series stainless steel mesh/Cr p reinforced geopolymer composites with different Si/Al molar ratio (N) were designed and prepared, where N = 1.75, 2 and 2.25, respectively. The effect of Si/Al molar ratio in the geopolymer matrix on mechanical properties and fracture behavior of the geopolymer composites were investigated. The microstructure of geopolymer became more compact when Si/Al increased from 1.75 to 2, which was beneficial to the improvement of geopolymer's mechanical properties. And continuing to rise to 2.25 for Si/Al, the completely curing of geopolymer composites required more time compared with lower Si/Al, which can be attributed to the different microstructure and chemical composition caused by the different Si/Al. The optimum Si/Al molar ratio was about 2 at which the composites samples present the best mechanical properties with the flexure strength of 115.3 MPa and elastic modulus of 11.0 GPa, respectively. The results of fracture behavior suggested that geopolymer composites with N is 2.25 displayed the behavior characteristics of metal materials, which can be attributed to a poor integrated condition in interface between reinforcements and geopolymer matrix.

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Section: Characterizationmentioning

confidence: 89%

“…4 d, a mass of geopolymer matrix flaked away. The surface of stainless steel mesh was still smooth and no corrosion in the alkaline environment [21]. This might result from the weak interfacial strength between stainless steel mesh and geopolymer matrix [25].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites

Yuan

Jia

2017

MATEC Web Conf.

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“…In geopolymer material, sodium aluminosilicate hydrate (N-A-S-H) gel is the main reaction product of low calcium fly ash-based geopolymer material and has similar elastic modulus to low density calcium silicate hydrate (C-S-H) which is the main reaction product in PCC [26][27][28]. In spite of an increasing attention towards the use of geopolymer concrete (GPC) as an alternative cementitious mixture, few studies have investigated the interphase between the geopolymer paste and aggregates [29,30].…”

Section: Introductionmentioning

confidence: 99%

An integrated microstructural-nanomechanical-chemical approach to examine material-specific characteristics of cementitious interphase regions

Khedmati

Kim

Turner

et al. 2018

Materials Characterization

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Abstract:Effective properties and structural performance of cementitious mixtures are substantially governed by the quality of the interphase region because it acts as a bridge transferring forces between aggregates and a binding matrix and is generally susceptible to damage. As alternative binding agents like alkali-activated precursors have obtained substantial attention in recent years, there is a growing need for fundamental knowledge to uncover interphase formation ACCEPTED MANUSCRIPTA C C E P T E D M A N U S C R I P T mechanisms. In this paper, two different types of binding materials, i.e., fly ash-based geopolymer and ordinary portland cement, were mixed with limestone aggregate to examine and compare the microstructures and nanomechanical properties of interphase region. To this end, microstructural characteristics using scanning microscopies, nanomechanical properties by nanoindentation tests, and spatial mapping of chemical contents based on the energy dispersive spectroscopy were integrated to identify and investigate the interphase region formed by the case-specific interactions between the matrix materials and limestone. The integrated microstructural-nanomechanicalchemical approach was effective to better understand links between material-specific properties of cementing phases. More specifically, the fly ash-based geopolymer paste was usually well bonded to the aggregate surface with a rich formation of N-A-S-H gel, while interfacial debonding was often observed between aggregate surface and paste in ordinary portland cement concrete. However, when a good bonding between aggregate and paste is formed, interphase region in PCC didn't show any considerable difference in nanomechanical properties compared to the bulk paste. ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T An Integrated Microstructural-Nanomechanical-Chemical Approach to Examine MaterialSpecific Characteristics of Cementitious Interphase Regions Abstract:Effective properties and structural performance of cementitious mixtures are substantially governed by the quality of the interphase region because it acts as a bridge transferring forces between aggregates and a binding matrix and is generally susceptible to damage. As alternative binding agents like alkali-activated precursors have obtained substantial attention in recent years, there is a growing need for fundamental knowledge to uncover interphase formation mechanisms. In this paper, two different types of binding materials, i.e., fly ash-based geopolymer and ordinary portland cement, were mixed with limestone aggregate to examine and compare the microstructures and nanomechanical properties of interphase region. To this end, microstructural characteristics using scanning microscopies, nanomechanical properties by nanoindentation tests, and spatial mapping of chemical contents based on the energy dispersive spectroscopy were integrated to identify and investigate the interphase region formed by the case-specific interactions between the matrix materials and limestone. The...

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“…, the coating maintained the high concentrations of Ti, C, and N, and the substrate had the constant W and Ti without N. There was a compositionally graded layer between the coating‐substrate, showing the gradual decreases of Ti, C, and N and the corresponding increases of W in the direction of the coating‐substrate. This graded layer was formed, probably because a small amount of N 2 gas remained even after the gas flow stopped . The free C was relatively concentrated in the coating, because N 2 gas tended to remove free C, as explained the aforementioned analyses.…”

Section: Analysis and Discussion Of Resultsmentioning

confidence: 99%

Surface‐interface microstructures and binding strength of cathodic arc ion plated TiCN coatings on YT14 cutting tools

Sun

Dejun

Liu

2016

Surface & Interface Analysis

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A titanium carbonitride (TiCN) coating was deposited on YT14 cutting tool by using a CAIP (cathodic arc ion plating). The surfaceinterface morphologies, chemical compositions, and phases of TiCN coatings were observed by using a FESEM (field emission scanning electron microscopy), EDS (energy dispersive spectroscopy), XRD (X-ray diffraction), respectively, and the bonding energy, surface roughness, and bonding strength were characterized with an XPS (X-ray photoelectron spectroscopy), AFM (atomic force microscope), and scratch test, respectively. The results show that the phases of the TiCN coating are primarily composed of TiN, TiC, and amorphous C, of which the TiC and TiN increases the coating hardness, and the amorphous C atom improves friction and lubrication properties of the coating. The effect of CAIP on the topography of the TiCN coating is at nano-scale, the Ti and N atoms are enriched in the coating at the bonding interface, and the part of chemical elements are diffused in the gradual transformation layer. The bonding form of the TiCN coating interface is primarily composed of mechanical combination, accompanying with slight metallurgical combination, and the bonding strength is characterized with 60.85 N by scratch test.

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Nanoindentation and SEM/EDX characterization of the geopolymer-to-steel interfacial transition zone for a reactive porcelain enamel coating

Cited by 48 publications

References 26 publications

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites

An integrated microstructural-nanomechanical-chemical approach to examine material-specific characteristics of cementitious interphase regions

Surface‐interface microstructures and binding strength of cathodic arc ion plated TiCN coatings on YT14 cutting tools

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Nanoindentation and SEM/EDX characterization of the geopolymer-to-steel interfacial transition zone for a reactive porcelain enamel coating

Cited by 48 publications

References 26 publications

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/CrpReinforced Geopolymer Composites

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/CrpReinforced Geopolymer Composites

An integrated microstructural-nanomechanical-chemical approach to examine material-specific characteristics of cementitious interphase regions

Surface‐interface microstructures and binding strength of cathodic arc ion plated TiCN coatings on YT14 cutting tools

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The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites