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Formation of nano‐ZrO 2 by laser surface treatment of ZrB 2 ‐SiC–based composite
Author(s) -
Das Jiten,
Vajjala Srinivas,
Tak Manish,
Jabbireddy Janardhana Reddy,
Velidandla Venkata Bhanu Prasad
Publication year - 2021
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13699
Subject(s) - materials science , spallation , tetragonal crystal system , laser , nano , composite material , composite number , nanoscopic scale , zirconium diboride , phase (matter) , grain size , nanotechnology , optics , ceramic , chemistry , physics , organic chemistry , quantum mechanics , neutron
This study aims at reducing the oxidation by forming a prior‐protective‐oxide scale by laser‐surface‐treatment of two ZrB 2 ‐SiC based composites namely ZrB 2 ‐20v/oSiC‐2v/oB 4 C‐0.24v/oC f (ZSC) and ZrB 2 ‐20v/oSiC‐2v/oB 4 C (ZS). ANSYS 15.0 was used to determine laser processing regime. Rigorous theoretical calculations provided temperature distribution, laser parameters and resulting laser power densities required to produce tetragonal ZrO 2 . Both the theoretical prediction as well as experimentation show that the laser‐surface‐treatment with the laser power densities of 31.85 and 56.61 W/mm 2 for 20 and 30 s render formation of nano‐tetragonal‐ZrO 2 (100–130 nm) at room temperature (RT). Morphology and size of the nano‐tetragonal‐ZrO 2 grains depends on the laser exposure time. Nano‐grain size helps in stabilizing tetragonal ZrO 2 phase at RT without the need of Y 2 O 3 addition. Nano‐tetragonal‐ZrO 2 may facilitate better ability for pegging, prevent scale‐spallation and act as thermal barrier coating (TBC).