Study of some of the physical variables of a metal-based system using the powder method

Salih, Eman J.; Allah, Sabah Mahmoud Aman; Darweesh, Salih Y.; Mohammed, Hussein A.

doi:10.1088/1742-6596/1999/1/012068

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…These weights are then used in various equations to calculate the aforementioned parameters. [26][27][28]:…”

Section: Test For True Density True Porosity and Water Absorbencymentioning

confidence: 99%

Production of a double cermet coating to treatment of the turbine blades

Antar,

Darweesh,

Ridha

2024

Eng. Res. Express

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Turbine blades often experience external failures, such as cracks and high pores, during operation. To address these issues, a method known as thermal spraying by flame is employed to apply cermet materials consisting of metal and ceramics onto the blades. The process involved incorporating manganese (Mn) into a chromium oxide (Cr2O3) base in varying proportions (3,6,9,12,15)%. Prior to this, the two mixtures underwent several preparatory steps, including being mixed with a micro-mill for two hours and then dried at 80°C for thirty minutes to remove any moisture present in the laboratory. The coating bases were prepared from an out-of-service turbine bit and shaped into squares with a side length of 1cm. The bases were then roughened and indented using a paint gun. The resulting models were sintered at a temperature of 1000°C for two hours. A number of structural and physical tests were carried out for the painted models before and after thermal sintering. Scanning electron microscope tests revealed crystalline regularity and lattice consistency of the outer surface especially at 15%Mn. Regarding the findings of the actual density, it was observed that the inclusion of manganese leads to a gradual enhancement in density with each subsequent addition. However, there was a consistent decrease in real porosity and water absorption, resulting in lower values at 15%. The hardness and adhesion strength exhibited significant improvements, increasing by approximately 15%. Conversely, the addition of the stiffener led to a continuous decrease in thermal conductivity. Thus, it was determined that the optimal coating parameters for achieving favorable outcomes were a coating distance of 16cm, a coating angle of 90°, and thermal sintering at 1000°C.

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“…These weights are then used in various equations to calculate the aforementioned parameters. [26][27][28]:…”

Section: Test For True Density True Porosity and Water Absorbencymentioning

confidence: 99%

Production of a double cermet coating to treatment of the turbine blades

Antar,

Darweesh,

Ridha

2024

Eng. Res. Express

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“…The pressure used for formation affects the proportion of pores [21]; because the use of high pressure will lead to an increase in compaction of granules and a decrease in porosity, the sintering temperature of the model for example, materials with low melting points within the composition will melt and fill the pores and reduce the porosity. The percentage of true porosity can be measured by the following relation [22]:…”

Section: Porositymentioning

confidence: 99%

Mechanical and Physical Properties of Al2O3-TiAl deposited by Thermal Spraying Method

Salih

Darweesh

Allah

2023

IJOIR

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In the current article, some physical properties of a system based on alumina (Al2O3) and supported by various weight ratios of TiAl were studied (5, 10, 15, 20, 25wt.%) by means of thermal spraying by flame, where oxygen gas was used at a pressure of 4bar, and acetylene at 0.7 bar. The base used for the coating is stainless steel type 316L, and a primary binder of 80%A1-20%Ni was coated with a thickness of approximately 100µm, while the base coating was 300µm thick, so that the total thickness was 400µm. The heat treatment of the final paint was carried out at a temperature of 1000°C for an hour and a half, after that physical tests were carried out through which the best mixing ratio was obtained, with a constant spraying distance of 16cm, and a constant spraying angle of 90° if found at that. The ideal conditions and after sintering that the best micro hardness is 56kg/mm2, the least porosity is 9.1%, and the highest adhesion strength is 29, while the results of the scanning electron microscope showed that the best mixing ratio is the 25wt.% in which the surface was homogeneous and has a consistent composition. An indication of the improvement of the samples with the continuation of repeated additions of the support material (TiAl).

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