Microstructural examination of HVOF chromium carbide coatings for high-temperature applications

1996 ◽  
Vol 5 (4) ◽  
pp. 483-489 ◽  
Author(s):  
J. M. Guilemany ◽  
J. Nutting ◽  
N. Llorcalsern
Keyword(s):  
High Temperature ◽  
Chromium Carbide ◽  
Carbide Coatings ◽  
Microstructural Examination ◽  
Chromium Carbide Coatings ◽  
Temperature Applications

Chromium Carbide Coatings for High Temperature Erosion Resistance

1996 ◽  
Author(s):  
D.R. Sielski ◽  
P. Sahoo
Keyword(s):  
High Temperature ◽  
Thermal Spray ◽  
Chromium Carbide ◽  
Power Plants ◽  
Life Cycles ◽  
Thermal Spray Coatings ◽  
Surface Protection ◽  
Spray Coatings ◽  
Carbide Coatings ◽  
Chromium Carbide Coatings

Abstract Escalating operation and maintenance costs and increasing intervals between outages place a heavy burden upon electric power producing components. To meet this demand, component life cycles must be extended with either material upgrades or utilization of surface protection products. This paper will discuss the experiences of the Tennessee Valley Authority in the application of thermal spray coatings and try to relate some of these experiences to component performance in fossil power plants' steam turbine components. The development of high velocity thermal spray processes has given coatings an advantage over the use of high priced material upgrades. Chromium carbide coatings have proven the most economical of the surface protection products for use in high temperature applications where solid particle erosion occurs. These coatings have received extensive laboratory testing where limited field results are now just becoming available. Various thermal spray coatings will be described. The development of newer coatings and laboratory test data will be discussed. Optical microscopy and wear studies will be included in the discussion. Where appropriate and available, comparisons to standard plasma sprayed coatings and uncoated substrata are made.

Preparation of chromium carbide coatings on graphite via powder immersion reaction assisted coating

2021 ◽  
Author(s):  
Huawen Qing ◽  
Zhenyu Wu ◽  
Huizheng Li ◽  
Haibo Guo ◽  
Yigang Chen
Keyword(s):  
Chromium Carbide ◽  
Carbide Coatings ◽  
Chromium Carbide Coatings

Deposition of chromium oxide-chromium carbide coatings via high velocity suspension flame spraying (HVSFS)

2018 ◽  
Vol 351 ◽  
pp. 171-176 ◽  
Author(s):  
Andrea Förg ◽  
Matthias Blum ◽  
Andreas Killinger ◽  
José Andrés Moreno Nicolás ◽  
Rainer Gadow
Keyword(s):  
Chromium Carbide ◽  
Chromium Oxide ◽  
High Velocity ◽  
Flame Spraying ◽  
Carbide Coatings ◽  
Chromium Carbide Coatings

Grinding of Chromium Carbide Coatings Using Electroplated Diamond Wheels

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Zhongde Shi ◽  
Amr Elfizy ◽  
Helmi Attia ◽  
Gilbert Ouellet
Keyword(s):  
Surface Roughness ◽  
Chromium Carbide ◽  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Depth Of Cut ◽  
Process Conditions ◽  
Carbide Coatings ◽  
Grinding Power ◽  
Chromium Carbide Coatings

This paper reports an experimental study on grinding of chromium carbide coatings using electroplated diamond wheels. The work was motivated by machining carbide coatings in gas turbine engine applications. The objective is to explore the process conditions and parameters satisfying the ground surface quality requirements. Surface grinding experiments were conducted with water-based grinding fluid on chromium carbide coated on flat surfaces of aluminum blocks for rough grinding at a fixed wheel speed vs = 30 m/s, and finish grinding at vs = 30, 60 m/s. The effects of depth of cut and workspeed on grinding power, forces, and surface roughness were investigated for each of the wheel speeds. Material removal rate Q = 20 mm3/s for rough grinding at a grinding width b = 101.6 mm was achieved. It was found that the maximum material removal rate achievable in rough grinding was restricted by chatters, which was mainly due to the large grinding width. The specific energy ranged from 27 to 59 J/mm3 under the tested conditions. Surface roughness Ra = 3.5–3.8 μm were obtained for rough grinding, while Ra = 0.6–1.5 μm were achieved for finish grinding. Surface roughness was not sensitive to grinding parameters under the tested conditions, but was strongly dependent on the diamond grain sizes. Imposing axial wheel oscillations to the grinding motions reduced surface roughness by about 60% under the tested condition. It was proved that it is feasible to grind the chromium carbide coating with electroplated diamond wheels.

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