2009•Rejiagong gongyiRequires access

Study on Microstructure and Properties of Al_2O_3(13%TiO_2) Coating and NiCr-Cr_3C_2 Coating Prepared by Plasma Spraying

Qiong Li

Abstract

Al2O3 (13%TiO2)coating and NiCr-Cr3C2 coating on 42CrMo steel substrate were prepared by plasma spraying. The microstructure, morphology and phase composition were analyzed by OM, XRD and SEM. And then the microhardness and thermal shock properties of the coatings were measured. The results show that the coatings are typical layer structure, which have mechanical bonding with the substrate. The main phases of Al2O3 coating is γ-Al2O3 as well as α- Al2O3. The main phase of NiCr-Cr3C2 coatings is Cr23C6, Cr7C3, Cr3C2, Cr2O3. The average microhardness of the Al2O3 coating and NiCr-Cr3C2 coating is 557.7HV and 586.4HV, respectively. The micro-cracks present in the NiCr-Cr3C2 coating after 25 times thermal shock tests and present in the Al2O3 coating after 18 times.

About this research paper

What this paper is about

Why it matters

A significance statement is not available in the OpenAlex record.

Key contribution

A contribution statement is not available in the OpenAlex record.

Method / approach

Method details are not available in the OpenAlex metadata.

Main findings

Findings are not separately available in the OpenAlex metadata.

Limitations

Limitations are not available in the OpenAlex metadata.

Applications

Application details are not available in the OpenAlex metadata.

Available abstract

Key concepts: Nichrome, Coating, Materials science, Microstructure, Thermal shock, Indentation hardness, Thermal spraying, Substrate (aquarium)