Synthesis of NiCr2O4 spinel coatings with high emissivity by plasma spraying

In this study, the feedstock powder for plasma spray was prepared by spray drying and post-sintering at 1360 °C using raw metal oxides. The high emissivity coating was deposited by air plasma spraying (APS). The microstructure, phase structure, flowability and bulk density of the plasma sprayed powder were characterized. The microstructure, bond strength and infrared emissivity of the high emissivity coating were also analyzed in this paper. The results reveal that the feedstock powder present good flowability of 42.36 (sp50g) with the bulk density of 1.94 gpml and is suitable for plasma spraying. A dense coating with the bond strength of 39.6MPa and the porosity less than 5 percent was prepared successfully. The normal emissivity of the coating in all waveband is 0.88 at 300°C and 0.87 at 600°C.

Download Full-text

Preparation and properties of high emissivity Fe–Mn–matrix coatings by air plasma spraying

Materials Research Innovations ◽

10.1179/1432891715z.0000000001511 ◽

2015 ◽

Vol 19 (sup4) ◽

pp. S29-S33 ◽

Cited By ~ 3

Author(s):

Hao Wang ◽

Xianjin Ning ◽

Quansheng Wang ◽

Yanbo Liu ◽

Yuting Song

Keyword(s):

Plasma Spraying ◽

Air Plasma ◽

Air Plasma Spraying ◽

High Emissivity

Download Full-text

Preparation and Investigation of High Emissivity Coatings Prepared by Plasma Spraying

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.512-515.1062 ◽

2012 ◽

Vol 512-515 ◽

pp. 1062-1065 ◽

Cited By ~ 1

Author(s):

Can Wang ◽

Quan Sheng Wang ◽

Xian Kai Sun

Keyword(s):

Bond Strength ◽

Plasma Spraying ◽

Raw Materials ◽

Air Plasma ◽

Before And After ◽

Plasma Sprayed ◽

Plasma Spraying Process ◽

Normal Emissivity ◽

Spraying Process ◽

High Emissivity

The high emissivity coating was deposited by Air Plasma Spraying (APS). Ni2O3, Cr2O3 were the main raw materials in this study. The feedstock powder was prepared by spray drying and post-sintering at 1420 °C for 2hours. The microstructure, phase structure, flowability and bulk density of the plasma sprayed powder were characterized. The microstructure, bond strength and infrared emissivity of the high emissivity coating were also analyzed in this paper. The results reveal that the powder before and after sintering presents good flowability and is suitable for plasma spraying process. A dense coating with the bond strength of 28.14MPa was prepared successfully. The normal emissivity of the coating in all waveband is 0.87 at the temperature of 300°C, 600°C, 900°C, 1000°C, 1100°C and 1200°C

Download Full-text

Electron microscopy studies of plasma-sprayed materials

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100074276 ◽

1983 ◽

Vol 41 ◽

pp. 70-71

Author(s):

K.R. Subramanian ◽

A.H. King ◽

H. Herman

Keyword(s):

Plasma Spraying ◽

Substrate Surface ◽

Flame Temperature ◽

Ceramic Coatings ◽

Metallic Substrates ◽

Hot Plasma ◽

Almost All ◽

Plasma Sprayed ◽

Hostile Environments ◽

Plasma Spraying Process

Plasma spraying is a technique which is used to apply coatings to metallic substrates for a variety of purposes, including hardfacing, corrosion resistance and thermal barrier applications. Almost all of the applications of this somewhat esoteric fabrication technique involve materials in hostile environments and the integrity of the coatings is of paramount importance: the effects of process variables on such properties as adhesive strength, cohesive strength and hardness of the substrate/coating system, however, are poorly understood.Briefly, the plasma spraying process involves forming a hot plasma jet with a maximum flame temperature of approximately 20,000K and a gas velocity of about 40m/s. Into this jet the coating material is injected, in powder form, so it is heated and projected at the substrate surface. Relatively thick metallic or ceramic coatings may be speedily built up using this technique.

Download Full-text