Composition design, phase transitions of a new polycrystalline Ni-Cr-Co-W base superalloy and its isothermal oxidation dynamics behaviors at 1300 °C

2017 ◽  
Vol 129 ◽  
pp. 26-33 ◽  
Author(s):  
Yubi Zhang ◽  
Xiaoyang Hu ◽  
Changrong Li ◽  
Weiwei Xu ◽  
Yongtao Zhao
Keyword(s):  
Phase Transitions ◽  
Isothermal Oxidation ◽  
Design Phase ◽  
Composition Design ◽  
Base Superalloy

Composition design, phase transitions and electrical properties of Sr2+-substituted xPZN–0.1PNN–(0.9−x)PZT piezoelectric ceramics

2016 ◽  
Vol 42 (3) ◽  
pp. 4080-4089 ◽  
Author(s):  
Yu Zhang ◽  
Xiaohong Zhu ◽  
Jiliang Zhu ◽  
Xiangming Zeng ◽  
Xiaodong Feng ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Electrical Properties ◽  
Piezoelectric Ceramics ◽  
Design Phase ◽  
Composition Design

Isothermal Oxidation Behavior of a New Directionally Solidified Ni-Base Superalloy in Air at Different Temperature

2010 ◽  
Vol 654-656 ◽  
pp. 538-541
Author(s):  
Lei Wang ◽  
Yan Huang ◽  
Zhuo Zhao ◽  
Yang Liu ◽  
Jian Tao Wu ◽  
...  
Keyword(s):  
Oxidation Resistance ◽  
Oxidation Behavior ◽  
Isothermal Oxidation ◽  
Oxidation Behaviour ◽  
Diffusion Activation Energy ◽  
Directionally Solidified ◽  
Temperature Range ◽  
Parabolic Law ◽  
Diffusion Activation ◽  
Base Superalloy

The isothermal oxidation behaviour under static atmosphere of a new directionally solidified Ni-base superalloy was investigated. The results showed that the oxidation kinetics curves of the alloy follow parabolic law in the temperature range of 750-950°C. The diffusion activation energy Q is to be about 244.86 kJ•mol-1 and the oxidation within this temperature range is mainly controlled by Cr3+ diffusion among Cr2O3 oxidation film. The oxidation resistance grade of the alloy is perfect anti-oxidation within 750-850°C, and anti-oxidation within 900-950°C. The oxidation film can be divided into TiO2, Cr2O3+TiTaO4+NiCr2O4, Al2O3 and TiN layers, from the surface to inside. Priority oxidation and the inside oxidation of Al are considered with the oxidation of Ti and the depletion of Cr, and it is the key point for the improving of oxidation resistance.

Isothermal Oxidation Behavior of Ni Base Superalloy DM02 for High Temperature Dies

2007 ◽  
Vol 546-549 ◽  
pp. 1253-1256
Author(s):  
Qing Li ◽  
Jin Xia Song ◽  
Cheng Bo Xiao ◽  
Shi Yu Qu ◽  
Ding Gang Wang ◽  
...  
Keyword(s):  
Weight Gain ◽  
High Temperature ◽  
Oxide Scale ◽  
Oxidation Resistance ◽  
Growth Mechanism ◽  
Oxidation Kinetics ◽  
Oxidation Behavior ◽  
Isothermal Oxidation ◽  
Good Oxidation Resistance ◽  
Base Superalloy

The isothermal oxidation behavior of a new developed Ni base superalloy named DM02 for high temperature dies was studied in this paper. The dynamic curve was achieved by monitoring weight gain of the alloy as a function of time. The results showed that the alloy had fairly good oxidation resistance at 1050°C and 1100°C. The oxidation kinetics at both 1050°C and 1100°C followed parabolic rules in segment. It has been found that the oxidation of the alloy was controlled by multi-oxides of (Ni, Co)O, (Ni, Co)Al2O4, and NiWO4, growth mechanism in the primary stage, and by Al2O3, NiAl2O4 growth mechanism in the following stage. After oxidation at 1050°C for 100h, the oxide scale of the alloy was mainly composed of two areas. Some were thin uniform (Ni， Co)Al2O4(outer)/Al2O3 (inner) composites scale and others were multi-layer oxide scale of ( Ni,Co)O / multi-oxides (mainly NiWO4、NiO and NiAl2O4.) /Al2O3.

Isothermal Oxidation Behavior of a Cast Ni3Al-Base Superalloy MX 246A

2007 ◽  
Vol 14 (5) ◽  
pp. 59-65 ◽  
Author(s):  
Wu-feng DENG ◽  
He-li LUO ◽  
Shang-ping LI ◽  
Tie-tao ZHOU
Keyword(s):  
Oxidation Behavior ◽  
Isothermal Oxidation ◽  
Base Superalloy

Development of a NiW In Situ Diffusion Barrier on a Fourth Generation Nickel-Base Superalloy

2008 ◽  
Vol 595-598 ◽  
pp. 23-32 ◽  
Author(s):  
Eric Cavaletti ◽  
Sebastien Mercier ◽  
Denis Boivin ◽  
Marie Pierre Bacos ◽  
Pierre Josso ◽  
...  
Keyword(s):  
Diffusion Barrier ◽  
Isothermal Oxidation ◽  
Oxidation Behaviour ◽  
Fourth Generation ◽  
Nickel Base Superalloy ◽  
Electrolytic Coating ◽  
Nickel Base ◽  
Base Superalloy

A diffusion barrier based on a NiW electrolytic coating has been developed to limit interdiffusion between a Ni-base superalloy (MCNG) and a β-NiAl bondcoating. Isothermal oxidation tests of 50h at 1100°C confirmed that W-rich layer formed with NiW coating modifies the oxidation behaviour of the bondcoat and limits interdiffusion. The diffusion barrier reduced β-NiAl  γ’-Ni3Al transformation in the bondcoating and prevented SRZ formation.

ISOTHERMAL OXIDATION BEHAVIOR OF THE DIRECTIONALLY SOLIDIFIED Ni-BASED SUPERALLOY DZ951 AT 900, 1000 AND 1100°C

2006 ◽  
Vol 20 (25n27) ◽  
pp. 3587-3592
Author(s):  
L. HUANG ◽  
H. R. GUAN ◽  
X. F. SUN ◽  
Y. L. WANG
Keyword(s):  
Oxidation Behavior ◽  
Solidification Process ◽  
Isothermal Oxidation ◽  
Directionally Solidified ◽  
Internal Corrosion ◽  
Parabolic Law ◽  
Composition Segregation ◽  
Long Time ◽  
C And N ◽  
Base Superalloy

The isothermal oxidation behavior of directionally solidified Ni -base superalloy DZ951 at 900, 1000 and 1100°C were investigated. Oxidized alloy was characterized by SEM, EDAX, XRD. A subparabolic time dependence ( n = 0.18 at 900°C and n = 0.08 at 1000°C) of the oxide growth rate was determined at relatively low temperature, while alloy nearly followed parabolic law at 1100°C ( n = 0.42). The severe composition segregation, which resulted from the solidification process, led to the formation of different scale on the dendritic and interdendritic regions at 900°C, however, this difference disappeared after oxidation at 1000 and 1100°C for long time. Furthermore, faceted and needle-shaped AlN precipitates developed in the alloy subsurface region after oxidation at 1100°C for 200h, while no internal corrosion products were found in 900 and 1000°C tests.

Thermal Corrosion Behavior of NiCoCrAlY Coatings Prepared by Different Thermal Spraying Methods

2011 ◽  
Vol 686 ◽  
pp. 686-691 ◽  
Author(s):  
Jie Sun ◽  
Dan Zhao ◽  
Li Li Zhang ◽  
Yong Tan
Keyword(s):  
High Velocity ◽  
Thermal Spraying ◽  
Weight Ratio ◽  
Isothermal Oxidation ◽  
Atmospheric Plasma ◽  
Nickel Base Superalloy ◽  
Detonation Spraying ◽  
Nickel Base ◽  
Low Pressure Plasma Spraying ◽  
Base Superalloy

The protection of thermal parts has become one of the most important techniques with the development of high capability and high thrust-weight ratio for advanced aeroengine. In this paper, using the nickel base superalloy as the substrate, the thermal corrosion performances of NiCoCrAlY coatings using different thermal spraying methods, which consisted of high velocity oxy-fuel (HVOF), detonation spraying (DS), atmospheric plasma praying (APS) and low pressure plasma spraying (LPPS), were studied. The thermal oxidation experiments, which consisted of isothermal oxidation and cycling oxidation experiments were performed to character the thermal performances. From the results, it was shown that the NiCoCrAlY coatings prepared by high velocity oxy-fuel method were slight for 100 hours at 1100°C. The surface of the NiCoCrAlY coatings prepared by HVOF had a dense, continued Al2O3 oxide layer. Among all the methods to prepare NiCoCrAlY coatings, the method of high velocity oxy-fuel showed excellent performance.

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