Mock-ups of thermal shields for international thermonuclear experimental reactor (ITER) have been manufactured by depositing 5-mm-thick W coatings on a CuCrZr alloy (ELBRODUR(R)). Coatings, made by controlled atmosphere plasma spray technique. have low porosity and excellent thermal fatigue resistance under high heat flux. Their structure has been investigated by scanning electron microscopy (SEM), scanning tunnel microscopy (STM), energy dispersion spectroscopy (EDS) and inductively coupled plasma (ICP) analysis. In spite of the remarkable thermo-mechanical properties of coatings, the present work evidenced some flaws (small cracks, unmolten W particles and presence of Ni in the external layers). Quality of coatings may be improved by strictly controlling purity and granulometry of sprayed W powders and some process parameters. (C) 2002 Elsevier Science B.V. All rights reserved.
Montanari, R., Riccardi, B., Volterri, R., Bertamini, L. (2002). Characterisation of plasma sprayed W coatings on a CuCrZr alloy for nuclear fusion reactor applications. MATERIALS LETTERS, 52(2009/02/01 00:00:00.000), 100-105 [10.1016/S0167-577X(01)00375-5].
Characterisation of plasma sprayed W coatings on a CuCrZr alloy for nuclear fusion reactor applications
MONTANARI, ROBERTO;VOLTERRI, ROBERTO;
2002-01-01
Abstract
Mock-ups of thermal shields for international thermonuclear experimental reactor (ITER) have been manufactured by depositing 5-mm-thick W coatings on a CuCrZr alloy (ELBRODUR(R)). Coatings, made by controlled atmosphere plasma spray technique. have low porosity and excellent thermal fatigue resistance under high heat flux. Their structure has been investigated by scanning electron microscopy (SEM), scanning tunnel microscopy (STM), energy dispersion spectroscopy (EDS) and inductively coupled plasma (ICP) analysis. In spite of the remarkable thermo-mechanical properties of coatings, the present work evidenced some flaws (small cracks, unmolten W particles and presence of Ni in the external layers). Quality of coatings may be improved by strictly controlling purity and granulometry of sprayed W powders and some process parameters. (C) 2002 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
