Formation of nano‐ZrO2 by laser surface treatment of ZrB2‐SiC–based composite. Issue 3 (15th February 2021)

• Record Type: Journal Article
• Authors: Das, Jiten; Vajjala, Srinivas; Tak, Manish; Jabbireddy, Janardhana Reddy; Velidandla Venkata, Bhanu Prasad
• Is Part Of: International journal of applied ceramic technology. Volume 18:Issue 3(2021)
• Page Start: 1004
• Page End: 1016
• Publication Date: 2021-02-15
• Subjects: laser processing regime -- laser surface treatment -- Nano‐tetragonal‐ZrO2; Ceramics -- Periodicals; Ceramics -- Technological innovations -- Periodicals; 620.1405
• DOI: 10.1111/ijac.13699
• Languages: English
• ISSNs: 1546-542X

Abstract

Abstract: This study aims at reducing the oxidation by forming a prior‐protective‐oxide scale by laser‐surface‐treatment of two ZrB2 ‐SiC based composites namely ZrB2 ‐20v/oSiC‐2v/oB4 C‐0.24v/oCf (ZSC) and ZrB2 ‐20v/oSiC‐2v/oB4 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 ZrO2 . 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‐ZrO2 (100–130 nm) at room temperature (RT). Morphology and size of the nano‐tetragonal‐ZrO2 grains depends on the laser exposure time. Nano‐grain size helps in stabilizing tetragonal ZrO2 phase at RT without the need of Y2 O3 addition. Nano‐tetragonal‐ZrO2 may facilitate better ability for pegging, prevent scale‐spallation and act as thermal barrier coating (TBC). Abstract : Identification of laser processing regime to obtain tetragonal ZrO2 phase.