scholarly journals Thermal shock resistance of ceramic fibre composites characterized by non-destructive methods

2008 ◽  
Vol 2 (2) ◽  
pp. 115-119 ◽  
Author(s):  
M. Dimitrijevic ◽  
M. Posarac ◽  
R. Jancic-Heinemman ◽  
J. Majstorovic ◽  
T. Volkov-Husovic ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Young Modulus ◽  
Test Surface ◽  
Composite Ceramics ◽  
Fibre Composites ◽  
Water Quench ◽  
Before And After ◽  
Shock Resistance ◽  
Non Destructive ◽  
Quench Test

Alumina based ceramic fibres and alumina based ceramic were used to produce composite material. Behaviour of composite ceramics after thermal shock treatments was investigated. Thermal shock of the samples was evaluated using water quench test. Surface deterioration level of samples was monitored by image analysis before and after a number of quenching cycles. Ultrasonic measurements were done on samples after quench tests. Dynamic Young modulus of elasticity and strength degradation were calculated using measured values of ultrasonic velocities. Strengths deterioration was calculated using the non-destructive measurements and correlated to degradation of surface area and number of quenches. The addition of small amount of ceramic fibres improves the strengths and diminishes the loss of mechanical properties of samples during thermal shock experiments.

scholarly journals Anisotropy analysis of low cement concrete by ultrasonic measurements and image analysis

2016 ◽  
Vol 48 (1) ◽  
pp. 57-70 ◽  
Author(s):  
Sanja Martinovic ◽  
Milica Vlahovic ◽  
Jelena Majstorovic ◽  
Tatjana Volkov-Husovic
Keyword(s):  
Image Analysis ◽  
Thermal Shock ◽  
High Alumina ◽  
Cement Concrete ◽  
Structural Anisotropy ◽  
Ultrasonic Measurements ◽  
Water Quench ◽  
Different Temperatures ◽  
Shock Resistance ◽  
Quench Test

The analized material was high alumina low cement castable sintered at three different temperatures. Influence of initial material anisotropy on the thermal shock resistance as well as changes of anisotropy level during the thermal shock were studied. Water quench test was used as an experimental method for the thermal stability testing. Surface anisotropy was analysed by image analysis and structural anisotropy using ultrasonic measurements. The results pointed out that the highest homogeinity and the lowest surface and structural anisotropy was for the samples sintered at 1600?C. Surface anistoropy had prevailing infuence on behavior of material during the thermal shock, but the structural anisotropy should not be neglected.

Water Quench Test for Thermal Shock Resistance of Porous Ceramics

2003 ◽  
Vol 2003 (0) ◽  
pp. 701-702
Author(s):  
Akihiko SUZUKI ◽  
Toshio SAKUMA ◽  
Nagatoshi OKABE ◽  
Masahiro ASAYAMA ◽  
Takuma MAKINO ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Porous Ceramics ◽  
Water Quench ◽  
Shock Resistance ◽  
Quench Test

Preparation of Yttria with Elongated Grains and Micro-Pores

2011 ◽  
Vol 197-198 ◽  
pp. 425-428
Author(s):  
Wen Bin Dai ◽  
Xin Li Wang ◽  
Peng Zhao ◽  
Jing Kun Yu
Keyword(s):  
Solid Solution ◽  
Thermal Shock ◽  
Grain Growth ◽  
Thermal Shock Resistance ◽  
Soaking Time ◽  
Water Quench ◽  
Shock Resistance ◽  
Quench Test

The effect of 1mol% calcia additive on sintering of yttria was investigated, and a yttria with elongated grains and micro-pores was developed in present work. The results showed that in calcia added samples heated at 1600°C, calcia contained yttria solid solution grains were formed and distributed among pure yttria grains. With the prolonging soaking time, they were concentrated into rod- or plate-like elongated grains and some of them were embedded into pure coarse yttria grains. Furthermore, in calcia added samples, grain growth was much faster and lots of micro-pores were left in coarse pure yttria grains. Water quench test revealed that thermal shock resistance of calcia added sample was greatly improved by elongated grains and micro-pores.

scholarly journals Influence of the damage level during quenching on thermal shock behavior of low cement castable

2010 ◽  
Vol 42 (2) ◽  
pp. 211-219 ◽  
Author(s):  
S. Martinovic ◽  
J. Majstorovic ◽  
V. Vidojkovic ◽  
T. Volkov-Husovic
Keyword(s):  
Image Analysis ◽  
Thermal Shock ◽  
Young Modulus ◽  
High Alumina ◽  
Strength Deterioration ◽  
Damage Level ◽  
Ultrasonic Measurements ◽  
Water Quench ◽  
Thermal Shock Behavior ◽  
Quench Test

In the recent decades, the use of unshaped monolithic refractories has been increasing greatly because of their significant advantages over other shaped refractory bricks of the same class. A low cement high alumina castable was synthetised and sintered at 1300?C in order to investigate thermal and mechanical properties, as well as thermal shock behavior. The water quench test was applied as an experimental method for thermal stability testing. Modification of the water quench test was performed by additional monitoring of the samples behavior during the water quench test such as implementation of image analysis and ultrasonic measurements. The image analysis program was applied on samples in order to measure the level of surface damage before and during the water quench test. Ultrasonic measurements were performed with the aim to measure the Young modulus of elasticity during the testing. Strength deterioration of the samples was calculated by the model based on ultrasonic velocity changes during the water quench test. The influence of monitoring the damage level before and during the quench experiment and its influence on thermal shock behavior will be discussed.

scholarly journals Young’s modulus evaluation and thermal shock behavior of a porous SiC/cordierite composite material

2015 ◽  
Vol 47 (3) ◽  
pp. 289-297
Author(s):  
M. Posarac-Markovic ◽  
J. Majstorovic ◽  
A. Devecerski ◽  
B. Matovic ◽  
T. Volkov-Husovic
Keyword(s):  
Composite Material ◽  
Thermal Shock ◽  
Young Modulus ◽  
Graphical Modeling ◽  
Graphite Content ◽  
Water Quench ◽  
Thermal Shock Behavior ◽  
Number Of Cycles ◽  
Porous Sic ◽  
Quench Test

Porous SiC/Cordierite Composite Material with graphite content (10%) was synthesized. Evaluation of Young modulus of elasticity and thermal shock behavior of these samples was presented. Thermal shock behavior was monitored using water quench test, and non destructive methods such are UPVT and image analysis were also used for accompaniment the level of destruction of the samples during water quench test. Based on the level of destruction graphical modeling of critical number of cycles was given. This approach was implemented on discussion of the influence of the graphite content on thermal stability behavior of the samples.

scholarly journals Thermal shock properties of glass-ceramics synthesized from a glass frit

2017 ◽  
Vol 49 (2) ◽  
pp. 139-147 ◽  
Author(s):  
Mira Cocic ◽  
Branko Matovic ◽  
Milica Posarac ◽  
Tatjana Volkov-Husovic ◽  
Jelena Majstorovic ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Glass Ceramics ◽  
Glass Frit ◽  
Test Image ◽  
X Ray ◽  
Ultrasonic Measurements ◽  
Water Quench ◽  
Shock Resistance ◽  
Quench Test

In this study, the behavior of glass-ceramics synthesized from a glass frit of FFW (Final Flotation Waste) originated from the RTB Bor Company was investigated. Thermal shock resistance was monitored in order to assess the possibility of application of such waste material. Thermal shock of the samples was conducted using water quench test. Image analysis and ultrasonic measurements were used as nondestructive methods for quantification of thermal shock damage at the surface and in the bulk of the specimens. Phase composition of samples was determined by X-ray powder diffraction (XRPD). The degradation level of samples was about 43 % after 20 cycles of water quench tests. The results pointed out that glass-ceramic material exhibited good thermal shock resistance.

Preparation of ZrO2 Composite Ceramics with High Thermal Shock Resistance

2012 ◽  
Vol 455-456 ◽  
pp. 650-654 ◽  
Author(s):  
He Yi Ge ◽  
Jian Ye Liu ◽  
Xian Qin Hou ◽  
Dong Zhi Wang
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Sintering Temperature ◽  
Fiber Composite ◽  
Physical And Mechanical Properties ◽  
Composite Ceramics ◽  
Shock Resistance ◽  
Absorption Measurements

The physical and mechanical properties of nanometer ZrO2-ZrO2fiber composite ceramics were studied by introduction of ZrO2fiber. ZrO2composite ceramics at different sintering temperature was investigated by porosity and water absorption measurements, flexual strength and thermal shock resistance analysis. Results showed that ZrO2composite ceramics containing 15 wt% ZrO2fiber with sintering temperature of 1650°C exhibited good mechanical properties and thermal shock resistance. The porosity and the water absorption were 8.84% and 1.62%, respectively. The flexual strength was 975 MPa and the thermal shock times reached 31 times. Scanning electron microscope (SEM) was used to analyze the microstructure of ZrO2composite ceramics.

Thermal Shock Resistance of Cordierite-Mullite Refractory Composites

2005 ◽  
Vol 290 ◽  
pp. 260-263 ◽  
Author(s):  
Zdeněk Chlup ◽  
Ivo Dlouhý ◽  
Aldo Roberto Boccaccini ◽  
D.N. Boccaccini ◽  
Cristina Leonelli ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Fracture Behaviour ◽  
Notched Specimen ◽  
Composite Systems ◽  
Microstructural Damage ◽  
Component Systems ◽  
Water Quench ◽  
Mullite Refractory ◽  
Shock Resistance ◽  
Points Of View

The design of composite materials leads to the development of multi-component systems where each constituent has a specific function in the material, from technological and/or application points of view. Examples of such composite systems are the cordierite-mullite refractory materials investigated in this contribution. Two different commercially available compositions were selected for evaluation of the influence of microstructure on fracture behaviour under thermal shock conditions. The materials were exposed to water-quench tests from 1250°C and subsequently the fracture toughness was evaluated using the chevron notched specimen technique. The results were compared to those obtained on as-received materials. Microstructural damage was also studied applying fractographic techniques with the aim to gain knowledge on the thermal shock damage mechanisms acting in the materials.

Properties of Ceramic Coatings on the Wall of Coke Oven

2011 ◽  
Vol 189-193 ◽  
pp. 1105-1108
Author(s):  
Shu Xian Liu ◽  
Li Li Shen ◽  
Qian Ping Wang
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
High Hardness ◽  
Coke Oven ◽  
Ceramic Coatings ◽  
Good Adhesion ◽  
Before And After ◽  
Shock Resistance ◽  
Uncoated Specimen ◽  
Better Than

Flame sprayed ceramic coatings on the wall of coke oven are characterized before and after melting. The attempt has been made to investigate thermal shock resistant, carbon deposit resistant, wear resistant of the coated and melted samples. The techniques used are SEM and XRD. The results show that: 1) Presence of quartz, corundum and mullite are identified in the surface of the coated specimen. Good adhesion between the coating and the substrate is caused by presence of quartz which is the same content as the substrate.2) The thermal shock resistance cycles of the coating samples are 15 ~ 30 times, but uncoated samples are only 1~2 times. The main reason is that he coating–substrate interface shows no gaps or cracks, and it has a characteristic feature of good adhesion between the coating and the substrate. 3) The wear resistance of the coated samples are better than that of the uncoated samples because glass-coating is more smooth than the uncoated specimen and the mullite and corundum in the coating have the high hardness value that makes the hardness of the coating increased.

Effect of AlF3 Content on Microstructure and Properties of Mullite/Al2O3 Composite Ceramics

2018 ◽  
Vol 922 ◽  
pp. 62-67
Author(s):  
Ke Zheng Sang ◽  
Fan Wang ◽  
De Jun Zeng ◽  
Hong Wei Li
Keyword(s):  
Fracture Toughness ◽  
Flexural Strength ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Diameter Ratio ◽  
Pressureless Sintering ◽  
Composite Ceramics ◽  
Microstructure And Properties ◽  
Shock Resistance ◽  
Mullite Whiskers

To reinforce the mullite/Al2O3 composite ceramics through formation of mullite whiskers, the composite ceramics were prepared by pressureless sintering using different AlF3 content. The microstructure, porosity, fracture toughness and thermal shock resistance of the composite ceramics were investigated. The results show that the addition of AlF3 can promote the mullite whisker formations, and the whiskers with the size of 3～10μm in diameter and a length-diameter ratio of 10～15 are obtained by sintering at 1600°C with the AlF3 content of 5wt%. Fracture toughness and thermal shock resistance of the composite ceramics are improved by the formation of mullite whisker. The fracture toughness of 4.79MPa•m1/2 can be obtained, and the 95.18% flexural strength remained after thermal shock.

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