Toughening mechanism of lined Al2O3-ZrO2 multiphase ceramics in SHS composite pipes

Yu, Guibo; Yan, Weiping; Wang, Shuhai; Su, Baoxin; Tan, Baolai

doi:10.1016/s1005-8850(06)60039-x

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…There is a major defect in this structure, the outer surface of the crystal size is large, brittleness is high, once a small crack arises, it is easy to generate the entire crystal damage, cracks will be expanded along the surface of the ceramic layer. Therefore, how to improve ceramic toughness effectively will be a investigation aspect of researcher [11][12][13][14][15]. For the present experiment, the pipe was cut into pieces that were 25mm high, then the compression-shear strength was tested by electronic universal testing machine, it was calculated by the following formula [16], the result was shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Study on Micstructure and Properties of Ceramic- Lined Composite Steel Pipes Produced by Centrifugal-SHS Process

Zhu

Sun

et al. 2011

KEM

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The Al2O3 ceramic-lined steel pipes were made by SHS centrifugal process. The microstructure and phases in ceramic layer were investigated by SEM and X-ray diffraction, microstructure of the ceramic was observed with metallurgical microscope and compression-shear strength of the ceramic was tested by electronic universal testing machine, respectively. The results show that composite steel pipe is composed of three layers, including inner ceramic layer, transition iron layer and outer metal wall, compression-shear strength of the ceramic layer is up to 23 MPa. The percentage of porosity was tested by archimedes principle, it shows that porosity of ceramic was 5%; corrosion resistance of ceramic was tested by mass-loss method, corrosion resistance of ceramic coating is 0.95g/(h•m2).

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Section: Resultsmentioning

confidence: 99%

Study on Micstructure and Properties of Ceramic- Lined Composite Steel Pipes Produced by Centrifugal-SHS Process

Zhu

Sun

et al. 2011

KEM

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“…The m-ZrO 2 phase has been detected more or less in the ZTA ceramics or in lined Al 2 O 3 -ZrO 2 multiphase ceramic layers of gravitational separation SHS composite steel pipes when they were prepared using the powder mixture of Al 2 O 3 and ZrO 2 stabilized by 3 mol% Y 2 O 3 by conventional sintering technique or by gravitational separation SHS process. 10,15,16) The presence of only metastable tetragonal ZrO 2 phase in the ceramic layer is bene cial for enhancement of fracture toughness. The absence of m-ZrO 2 phase in the ceramic layers might be related with the solidi cation features of CLCSPs produced by centrifugal-SHS process.…”

Section: Microstructures Of Ceramic Layersmentioning

confidence: 99%

High-Performance Ceramic-Lined Composite Pipes with ZrO<sub>2</sub> Additive Prepared by Centrifugal-SHS Process

Xuan

Wen

et al. 2016

Mater. Trans.

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High-performance ceramic-lined composite steel pipes (CLCSPs) were fabricated by self-propagating high-temperature synthesis and centrifugal casting technique. ZrO 2 powders doped by 3 mol% Y 2 O 3 were added into Al-Fe 2 O 3 thermit to improve the mechanical properties of CLCSPs. The phase constituents and microstructural evolution of ceramic layers after addition of ZrO 2 were analyzed by means of X-ray diffractometer, optical microscope, scanning electron microscope and energy dispersive X-ray spectrometer. The effects of ZrO 2 on fracture toughness of ceramic layers, and crushing strength as well as mechanical shock of CLCSPs were investigated using Vickers indentation microfracture method, squeezing test and repetitive impacting method. The results show that addition of ZrO 2 changes the morphology and preferential orientation of Al 2 O 3 dendrites, and reduces the width of Al 2 O 3 dendrites, leading to the microstructure of Al 2 O 3 dendrites with ne t-ZrO 2 phase particles distributed at boundaries. The hardness of ceramic layer decreases, while the crushing strength of CLCSP changes slightly after addition of ZrO 2 . The fracture toughness of ceramic layer is signi cantly enhanced; meanwhile the mechanical shock resistance of CLCSPs was also greatly improved by adding more than 2% ZrO 2 . The optimum adding amount of ZrO 2 is

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“…The advantages of SHS technique include [8,9]: (1) higher purity of the products and low cost; (2) low energy requirement, relative simplicity of the process and equipment, the heat released during exothermic reactions obtains a self-sustained system when raw materials are ignited without additional energy; (3) high efficiency, SHS is based on the use of chemistry reaction synthesis and sintering materials, saving sintering time at high temperature. Many ceramic-matrix composites such as TiC-Al 2 O 3 , TiC-TiB 2 , Al 2 O 3 -ZrO 2 have been fabricated using this technology [10][11][12]. In this paper Ni-Al intermetallics bonded TiC porous cermet was synthesized and fabricated by SHS method with changing the state of raw materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ni-Al Intermetallics Bonded TiC Porous Cermets by SHS Method

Huang

Shi

2009

MSF

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Porous cermets composites were prepared from mixed powders (Ni, Al, Ti and C) by SHS (Self-propagating High-temperature Synthesis) method. When Ni-Al intermetallics bonded TiC porous cermets substitute for TiC ceramic as perform in the process of manufacturing Ni-Al/TiC composites by pressureless melt infiltration, the wetting of the ceramic material and Ni-Al intermetallics can be improved. In this study, the microstructure and mechanical properties (density and compressive resistance strength) were reported. It is learnt from the study that the relation between the open porosity and the pore size does not exist, the former depends on the green density, and the latter depends on the particle size of the nickel powder. The porous cermets with porosity ranging from 40% to 50%, pore size from 1μm to 300μm, and the compressive resistance strength about 15 MPa can be prepared by SHS. SEM observations of fracture surface suggest the fracture mode is brittleness fracture, and the microstructures of the porous cermets are very homogenous.

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Toughening mechanism of lined Al2O3-ZrO2 multiphase ceramics in SHS composite pipes

Cited by 6 publications

References 1 publication

Study on Micstructure and Properties of Ceramic- Lined Composite Steel Pipes Produced by Centrifugal-SHS Process

Study on Micstructure and Properties of Ceramic- Lined Composite Steel Pipes Produced by Centrifugal-SHS Process

High-Performance Ceramic-Lined Composite Pipes with ZrO<sub>2</sub> Additive Prepared by Centrifugal-SHS Process

Preparation of Ni-Al Intermetallics Bonded TiC Porous Cermets by SHS Method

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