STUDY OF THE PHASE TRANSFORMATION OF WC-NI SPRAYED COATINGS DURING HEAT TREATMENT IN A VACUUM CHAMBER BY XRD

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KHAMENEH ASL SHAHIN; HEYDARZADEH SOHI MAHMOUD

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Seminar Paper

Paper Information

Seminar: NATIONAL VACUUM CONFERENCE IRAN
Year:2008 | Issue:3

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Title

STUDY OF THE PHASE TRANSFORMATION OF WC-NI SPRAYED COATINGS DURING HEAT TREATMENT IN A VACUUM CHAMBER BY XRD

Author(s)

KHAMENEH ASL SHAHIN | HEYDARZADEH SOHI MAHMOUD

Keywords

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Abstract

IN THIS STUDY WC-NI COATING WAS THERMALLY SPRAYED BY HIGH VELOCITY OXY-FUEL (HVOF) METHOD AND THEN HEAT TREATED UNDER VACUUM ATMOSPHERE. PHASE TRANSFORMATION DURING HEAT TREATMENT AT VARIOUS TEMPERATE AND HOLDING TIMES WAS STUDIED BY AN X-RAY DIFFRACTION (XRD) FACILITY EQUIPPED WITH A VACUUM HEATING CHAMBER AND A HIGH TEMPERATURE GONIOMETRY (HTK). COMPARISON OF THE X RAY DIFFRACTION PATTERNS OF FEED STOCK POWDER AND AS SPRAYED COATING INDICATED FORMATION OF AN AMORPHOUS PHASE AND ALSO NI2W4C COMPLEX PHASE IN THE AS SPRAYED COATING. THE UNSTABLE AMORPHOUS PHASE CAN BE CRYSTALLIZED AND STABILIZED BY HEAT TREATMENT AND TRANSFORM TO NIW. THIS PHASE TRANSFORMATION IS SIMILAR TO ALL DIFFUSION CONTROLLED TRANSFORMATIONS AND IS CONTROLLED BY TEMPERATURE AND HOLDING TIME IN HEAT TREATMENT AND THE TEMPERATURE IS MORE EFFECTIVE THAN HOLDING TIME. THE RESULTS ALSO SHOWED THAT HEAT TREATMENT AT 950OC IS NOT SUITABLE FOR THIS PHASE TRANSFORMATION AND 1100OC IS NEEDED FOR THE AFOREMENTIONED TRANSFORMATION.

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APA: Copy

KHAMENEH ASL, SHAHIN, & HEYDARZADEH SOHI, MAHMOUD. (2008). STUDY OF THE PHASE TRANSFORMATION OF WC-NI SPRAYED COATINGS DURING HEAT TREATMENT IN A VACUUM CHAMBER BY XRD. NATIONAL VACUUM CONFERENCE IRAN. SID. https://sid.ir/paper/905395/en

Vancouver: Copy

KHAMENEH ASL SHAHIN, HEYDARZADEH SOHI MAHMOUD. STUDY OF THE PHASE TRANSFORMATION OF WC-NI SPRAYED COATINGS DURING HEAT TREATMENT IN A VACUUM CHAMBER BY XRD. 2008. Available from: https://sid.ir/paper/905395/en

IEEE: Copy

SHAHIN KHAMENEH ASL, and MAHMOUD HEYDARZADEH SOHI, “STUDY OF THE PHASE TRANSFORMATION OF WC-NI SPRAYED COATINGS DURING HEAT TREATMENT IN A VACUUM CHAMBER BY XRD,” presented at the NATIONAL VACUUM CONFERENCE IRAN. 2008, [Online]. Available: https://sid.ir/paper/905395/en

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