Effect of SiC-mullite coatings on oxidation resistance of graphite

Aliakbarpour, S.; Zakeri, M.; Rahimipour, Mohammad Reza; Irankhah, Reza

doi:10.1179/1743676114y.0000000173

Cited by 14 publications

(2 citation statements)

References 18 publications

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“…Graphite is an attractive material for HT application and has been widely used as structural material due to the excellent HT mechanical properties [42,43]. And SiC is being considered as a protective coating to protect the graphite from oxidation [44,45] due to its excellent and superior properties of melting point, thermal shock resistance, and chemical inertness [46].…”

Section: Materials and Experimental Processmentioning

confidence: 99%

Evaluating high temperature elastic modulus of ceramic coatings by relative method

et al. 2017

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Abstract:The accurate evaluation of the elastic modulus of ceramic coatings at high temperature (HT) is of high significance for industrial application, yet it is not easy to get the practical modulus at HT due to the difficulty of the deformation measurement and coating separation from the composite samples. This work presented a simple approach in which relative method was used twice to solve this problem indirectly. Given a single-face or double-face coated beam sample, the relative method was firstly used to determine the real mid-span deflection of the three-point bending piece at HT, and secondly to derive the analytical relation among the HT moduli of the coating, the coated and uncoated samples. Thus the HT modulus of the coatings on beam samples is determined uniquely via the measured HT moduli of the samples with and without coatings. For a ring sample (from tube with outer-side, inner-side, and double-side coating), the relative method was used firstly to determine the real compression deformation of a split ring sample at HT, secondly to derive the relationship among the slope of load-deformation curve of the coated ring, the HT modulus of the coating and substrate. Thus, the HT modulus of ceramic coatings can be evaluated by the substrate modulus and the load-deformation data of coated rings. Mathematic expressions of those calculations were derived for the beam and ring samples. CVD-SiC coatings on graphite substrate were selected as the testing samples, of which the measured modulus ranging from room temperature to 2100 ℃ demonstrated the validity and convenience of the relative method.

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Section: Materials and Experimental Processmentioning

confidence: 99%

Evaluating high temperature elastic modulus of ceramic coatings by relative method

et al. 2017

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“…Zirconia is a biomaterial that has a bright future because of its high mechanical strength and fracture toughness. Zirconia containing ceramics have exceptionally high fracture toughness compared with other structural ceramics [6,7,8,9]. Application areas vary from conventional/traditional like refractory and glass to the more advanced fields like ball-bearing, automobile appliances, turbine blades, grinding media, etc.…”

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confidence: 99%

Effect of Zirconia Addition on Pre Formed Magnesium Aluminate Spinel

Kumar¹,

Sinha²

2015

IJERT

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Zirconia containing ceramics have exceptionally high fracture toughness compared with other structural ceramics. Application areas vary widely from traditional uses like refractory and glass to the more advanced fields like ballbearing, automobile appliances, turbine blades, grinding media, cutting tools, space shuttles to bio-implantations. It has the potential to toughen and / or strengthen ceramic matrix utilizing the stress-induced tetragonal to monoclinic phase transformation of ZrO2 .In the present work monoclinic zirconia (0.5-10wt %) doped preformed MgAl2O4 Spinel powder was synthesized and characterized. The mean particle size of the spinel powder was 8.54 µm and that of zirconia was 5.67 µm. The bulk density increased gradually from 2.34 gm/cm 3 of Spinel to 2.52, 2.66, 2.86 gm/cm 3 with 10% zirconia added sample at 1350 o C/1h ,1500 o C and 1650 o C for 1 hour respectively. The apparent porosity of spinel also decreased from 33.29% to 32.00, 29.78 & 23.28% at 1350, 1500 & 1650 o C/1h respectively with 10 wt.% zirconia addition. XRD of all the compositions fired at different temperature reveals that with increase in zirconia content and temperature, transformation of monoclinic to tetragonal phase increased up to 1500 o C, but slightly decreased thereafter at 1650 o C. The mechanical strength of the spinel increased gradually with increase in Zirconia content and temperature. The compressive strength increased three fold from 9.39MPa in spinel only to 24.7MPa with 10wt% zirconia at 1350 o C. With increase in temperature to 1650 o C the fracture toughness also exhibited an increase from 40.4MPa to 82.1MPa with 10wt% zirconia.

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