Investigation on crack initiation, propagation, and arrest in thick-walled cylinders under thermal-shock loading
0
Citation
17
Reference
10
Related Paper
Keywords:
Thermal shock
WT5BZ]The influence of additive CeO 2 and SiO 2 with different content on the thermal shock failure life of Cr 2O 3 coating was studied It is shown that the thermal shock failure mechanism of coating is thermal stress fatigue destruction through thermal shock text The critical temperature range △T C can be greatly enhanced by adding CeO 2 and SiO 2 to Cr 2O 3 layer through reanalysis the results of thermal shock experiment date The addition of proper amount of CeO 2 to Cr 2O 3 layer obviously increase the coefficient of coating's resistance to thermal shock , but proper amount of SiO 2 to Cr 2O 3 layer greatly increase △T C The choosing additive is based on the serve condition of coating When coating works at temperature being lower 300℃,the adding 3 0% CeO 2 to Ce 2O 3 layer is chosen because which has the best complex property But, when coating works between 300℃ and 500℃, the SiO 2 is chosen as additive to Cr 2O 3 layer, which has longer thermal shock lifetime
Thermal shock
Cite
Citations (0)
The influence of CeO2 with different content on the thermal shock resistance of plasmasprayed Cr2O3 coating was investigated. The thermal shock failure mechanism of coating was also studied. It is found that the thermal shock failure mechanism of coating is thermal stress fatigue destruction, and the destruction takes place at interface of ceramic and bond coating. The experimental results show that the lifetime of coating fracture and failure increase considerably when 3% CeO2 is added into the plasma-sprayed Cr2O3 coating. The suitable content of CeO2 makes the microcracks exist in network form. The microcrack net can release internal stress in coating, delay the crack forming and expanding and decrease holes in coating. Thus the thermal shock resistance increase largely.
Thermal shock
Failure mechanism
Cite
Citations (0)
The influence of CeO 2 with different content on the thermal shock resistance of plasma sprayed Cr 2O 3 coating was investigated. The thermal shock failure mechanism of coating was also studied. It is found that the thermal shock failure mechanism of coating is thermal stress fatigue destruction, and the destruction takes place at interface of ceramic and bond coating. The experimental results show that the lifetime of coating fracture and failure increase considerably when 3%CeO 2 is added into the plasma sprayed Cr 2O 3 coating. The suitable content of CeO 2 makes the microcracks exist in network form. The microcrack net can release internal stress in coating, delay the crack forming and expanding and decrease holes in coating. Thus the thermal shock resistance increase largely.
Thermal shock
Failure mechanism
Cite
Citations (0)
The characterisation of thermal shock damage in cordierite–mullite refractory plates used as substrates in fast firing of porcelain whiteware has been investigated. Two different refractory compositions (termed REFO and CONC), characterised by different silica to alumina ratios, were studied. Thermal shock damage was induced in as received samples by water quenching tests from 1250°C. Thermal and mechanical properties were measured at room temperature by means of standard techniques and then the thermal shock resistance parameter R was calculated. The fracture toughness of selected samples was measured before and after thermal shock by the chevron notched specimen technique. The reliability of this technique for evaluation of small differences in fracture toughness after a given number of thermal shock cycles was investigated. The suitability of K Ic measurements by the chevron notched specimen technique to characterise the development of thermal shock damage in refractory materials was proved in this investigation.
Thermal shock
Mullite
Cordierite
Refractory (planetary science)
Cite
Citations (10)
The thermal shock resistance of an Al\-2O\-3/(W,Ti)C functionally gradient ceramic material with symmetrical structure is investigated by means of water quench tests as well as the calculation of transient thermal stresses during thermal shock process.The results indicate that the thermal shock resistance of ceramic material can be improved by controlling the compositional distribution appropriately.
Thermal shock
Transient (computer programming)
Temperature Gradient
Cite
Citations (0)
Thermal shock
Cite
Citations (15)
Thermal shock
Cite
Citations (9)
An evaluation of thermal shock resistances for structural ceramics was conducted by employing various types of Vickers-indented specimens with different Biot moduli. Then, examination of the correlations between thermal shock resistances obtained by the author's method and usual thermal shock resistances, such as thermal shock fracture resistance and thermal shock damage resistance, was conducted. As a result, the correspondence between the minimum thermal shock condition required for the onset of propagation of generated microcracks and the thermal shock fracture resistance was recognized by conducting repeated thermal shock tests using thicker SiC specimens which have larger Biot moduli. The amount of crack growth per thermal shock cycle implies the same meanings as thermal shock damage resistance for various structural ceramics.
Thermal shock
Biot number
Temperature cycling
Cite
Citations (0)
The influence of additive CeO 2 with different content on the thermal shock resistance of plasma sprayed Cr 2O 3 coating was studied.It is found that the addition of 3.0%CeO 2 to Cr 2O 3 layer reduces the amount and the size of the pores in ceramic layer,and thus increases the resistance to thermal shock.The thermal shock failure of ceramic coating is essentially the fatigue failure induced by cyclic thermal stress during repeated heating and cooling.
Thermal shock
Cite
Citations (0)
Thermal shock
Residual strength
Alumina ceramic
Cite
Citations (21)