Potential for Using Yttrium Oxide Powder as a Strengthening Phase for Centrifugal Casting of Corrosion-Resistant Steels

2020 ◽  
Vol 50 (7) ◽  
pp. 434-437
Author(s):  
V. I. Chumanov ◽  
I. V. Chumanov
Keyword(s):  
Yttrium Oxide ◽  
Centrifugal Casting ◽  
Oxide Powder ◽  
Strengthening Phase ◽  
Corrosion Resistant

scholarly journals Possibility of using yttrium oxide powder as a strengthening phase for centrifugal casting of corrosion-resistant steels

2020 ◽  
Vol 63 (7) ◽  
pp. 499-503
Author(s):  
I. V. Chumanov ◽  
V. I. Chumanov
Keyword(s):  
Yttrium Oxide ◽  
Metal Matrix ◽  
System Modeling ◽  
Centrifugal Casting ◽  
Matrix Material ◽  
Casting Machine ◽  
Oxide Powder ◽  
Iron Matrix ◽  
Matrix Metal ◽  
Metal Base

The authors have made an analysis of necessity to improve the composition of the existing structural materials for critical purposes in the direction of creating metal matrix materials, which combine a highly plastic metal base and refractory high-strength high-modulus fillers. For iron matrix alloys, dispersed yttrium oxide (Y2O3 ) particles are preferred because of their stability at pyrometallurgical process temperatures and inertness to alloy components. The technology of obtaining new materials by introducing dispersed particles into a liquid melt during casting using a centrifugal casting machine to obtain a hollow (pipe) billet is considered. The possibility of increasing the mechanical and operational properties of metal matrix materials in comparison with monomaterial is shown. The article describes results of the thermodynamic modeling of high-temperature processes occurring in the yttrium oxide - metal matrix (melt) system. Modeling was carried out using the FactSage software package. A composition corresponding to 12Cr18Ni10Ti steel was used as the modeling composition of the matrix material. The calculations were made according to the ratio of 1 g of yttrium oxide additive per 100 g of matrix metal melt. From the simulation results it is possible to conclude that the introduced dispersed yttrium oxide powder does not interact with the alloy components, does not dissociate, and does not undergo allotropic transformations. The expediency of conducting experiments on the production of centrifugal castings using yttrium oxide as a hardening phase with the aim of a possible increase in radiation resistance is shown. Directions are indicated for developing the most effective technology for creating metallic materials based on an iron matrix dispersed-hardened by yttrium oxide.

scholarly journals Operational properties of chromium coatings obtained from self-regulating electrolyte with addition of nano-dimensional particles

2019 ◽  
pp. 95-100
Author(s):  
Sergey Aleksandrovich Shishurin
Keyword(s):  
Wear Resistance ◽  
Aluminum Oxide ◽  
Oxide Powder ◽  
Nanocomposite Coatings ◽  
Alumina Powder ◽  
Laboratory Studies ◽  
Strengthening Phase ◽  
Aluminum Oxide Powder

The article presents the results of laboratory studies of microhardness and wear resistance of basic and nanocomposite electroplating chromium coatings. The most effective strengthening phase was chosen - nanosized alumina powder at a concentration of 3 g / l. The use of nano-sized aluminum oxide powder makes it possible to increase the microhardness and wear resistance of nanocomposite coatings by 1.5-1.8 times as compared to the base ones.

The research of wear and corrosion-resistant properties of laser coatings with strengthening phase

2020 ◽  
Vol 10 (3) ◽  
pp. 305-313
Author(s):  
Anatoly N. Cherepanov ◽  
◽  
Alexander G. Malikov ◽  
Anatoly M. Orishich ◽  
Vladimir O. Drozdov ◽  
...  
Keyword(s):  
Structural Phase ◽  
Micro Hardness ◽  
Strengthening Phase ◽  
Corrosion Resistant ◽  
Average Value ◽  
Support Plate ◽  
Wear And Corrosion ◽  
Composite Mixture ◽  
Laser Coating ◽  
Corrosion Resistant Coatings

One of the most promising methods of spraying protecting coating is the laser coating with strengthening phases, alloying or modifying elements. The purpose of this study is the creation of composite wear and corrosion resistant coatings by additive technology of laser coating for oil and mining industries. The possibility of obtaining complex coating with a strengthening phase is shown. Two variants of coating were considered. Variant 1: support plate made of 12Х18Н10Т stainless steel was cladded with sublayer made of Ni + Cr powder, afterwards the upper cladding layer made of Х23Н5М3ГС steel of Cr-Ni-Мn system was formed with various content of strengthening WC phase in the form of VK-12 powder. Variant 2: support plate made of carbon steel was cladded with four layers of self-fluxing cladding powder PS-12NVK-01 of Ni-Cr-Fe / WC system with addition of nanomodification of powder TiN + Y2O3 + Cr + Fe. The specialists established the dependence of microstructure, structural-phase components and micro hardness of cladded layer from the quantity of WC strengthening phase. The various content of WC strengthening phase (from 10 to 30 %) does not influence the micro hardness of the upper layer significantly – it’s average value is ≈ 700 HV The laser influence on powder mixture leads to partial deterioration of WC strengthening phase, which leads to chemical reaction of tungsten cobalt powder and stainless steеl with formation of complex intermetallic compounds and carbides. Small addition of nanosized modifier TiN + Y2O3 (0,1 % of weight) in a composite mixture with coating power PS-12NVK-01 allows increasing the hardness of protective coating by 1.4, and wear-resistance – by 2 times in comparison to the coatings with similar characteristics, obtained without nanomodifying additions.

scholarly journals USING GEOPOLYMER COMPOSITES FOR HEAT AND CORROSION RESISTANT PIPES

2020 ◽  
Vol 1 (1) ◽  
pp. 17-20
Author(s):  
A. Su’udi ◽  
J. Akmal ◽  
N. Tanti ◽  
Arizon .
Keyword(s):  
Fly Ash ◽  
Mechanical Test ◽  
Centrifugal Casting ◽  
Casting Process ◽  
Optimum Composition ◽  
Bending Test ◽  
Pipe Material ◽  
Physical Test ◽  
Corrosion Resistant ◽  
Geopolymer Composites

This research studied the use of carbon fiber reinforced geopolymer composites as corrosion resistant pipe material. Geopolymer material is a general term for material synthesized from fly ash. Fly ash is an industrial by-product (coal combustion residue) with high silica content (SiO2) and Alumina content (Al2O3). In addition, there are also other elements in a relatively small percentage. This material will compound like cement if activated with Sodium Silicate. This study aims to obtain the optimum composition for high quality mechanical properties. The method used is to synthesize material with various elemental compositions. Furthermore, a mechanical test (bending test) is performed to see the effect of each element to be optimized. Besides that, a physical test in the form of SEM-EDX was also conducted to see the microstructure. Materials with optimum composition have been fabricated as pipes with centrifugal casting process. Mechanical testing of pipe samples is done by hoop tensile strength test. The test results show that the strength of geopolymer composites can achieve 58 MPa.

Multilayer structure of Al-Si alloy after electro-explosion alloying with yttrium oxide powder

2018 ◽  
Vol 5 (11) ◽  
pp. 116520 ◽  
Author(s):  
Sergey Konovalov ◽  
Victor Gromov ◽  
Yurii Ivanov
Keyword(s):  
Yttrium Oxide ◽  
Multilayer Structure ◽  
Oxide Powder

Synthesis of thermal spray grade yttrium oxide powder and its application for plasma spray deposition

2007 ◽  
Vol 106 (2-3) ◽  
pp. 416-421 ◽  
Author(s):  
P.V.A. Padmanabhan ◽  
S. Ramanathan ◽  
K.P. Sreekumar ◽  
R.U. Satpute ◽  
T.R.G. Kutty ◽  
...  
Keyword(s):  
Thermal Spray ◽  
Yttrium Oxide ◽  
Plasma Spray ◽  
Spray Deposition ◽  
Oxide Powder

Physical, Chemical, and Crystallographic Characterization of Anodic Coatings on High Strength Aluminum Base Alloys

1976 ◽  
Vol 34 ◽  
pp. 636-637
Author(s):  
R. E. Herfert ◽  
N. T. McDevitt
Keyword(s):  
Sulfuric Acid ◽  
Salt Spray ◽  
High Strength ◽  
Environmental Stability ◽  
Anodic Films ◽  
Sodium Dichromate ◽  
Corrosion Resistant ◽  
Aerospace Applications ◽  
Bond Strengths ◽  
Adhesive Bonded Joints

Durability of adhesive bonded joints in moisture and salt spray environments is essential to USAF aircraft. Structural bonding technology for aerospace applications has depended for many years on the preparation of aluminum surfaces by a sulfuric acid/sodium dichromate (FPL etch) treatment. Recently, specific thin film anodizing techniques, phosphoric acid, and chromic acid anodizing have been developed which not only provide good initial bond strengths but vastly improved environmental durability. These thin anodic films are in contrast to the commonly used thick anodic films such as the sulfuric acid or "hard" sulfuric acid anodic films which are highly corrosion resistant in themselves, but which do not provide good initial bond strengths, particularly in low temperature peel.The objective of this study was to determine the characteristics of anodic films on aluminum alloys that make them corrosion resistant. The chemical composition, physical morphology and structure, and mechanical properties of the thin oxide films were to be defined and correlated with the environmental stability of these surfaces in humidity and salt spray. It is anticipated that anodic film characteristics and corrosion resistance will vary with the anodizing processing conditions.

Could biomass-fueled boilers be operated at higher steam temperatures? Part 3: Initial analysis of costs and benefits

TAPPI Journal ◽  
2014 ◽  
Vol 13 (8) ◽  
pp. 65-78 ◽  
Author(s):  
W.B.A. (SANDY) SHARP ◽  
W.J. JIM FREDERICK ◽  
JAMES R. KEISER ◽  
DOUGLAS L. SINGBEIL
Keyword(s):  
Flue Gas ◽  
Power Plants ◽  
Superheated Steam ◽  
Black Liquor ◽  
Simulation Software ◽  
Operating Conditions ◽  
Costs And Benefits ◽  
Steam Generation ◽  
Fireside Corrosion ◽  
Corrosion Resistant

The efficiencies of biomass-fueled power plants are much lower than those of coal-fueled plants because they restrict their exit steam temperatures to inhibit fireside corrosion of superheater tubes. However, restricting the temperature of a given mass of steam produced by a biomass boiler decreases the amount of power that can be generated from this steam in the turbine generator. This paper examines the relationship between the temperature of superheated steam produced by a boiler and the quantity of power that it can generate. The thermodynamic basis for this relationship is presented, and the value of the additional power that could be generated by operating with higher superheated steam temperatures is estimated. Calculations are presented for five plants that produce both steam and power. Two are powered by black liquor recovery boilers and three by wood-fired boilers. Steam generation parameters for these plants were supplied by industrial partners. Calculations using thermodynamics-based plant simulation software show that the value of the increased power that could be generated in these units by increasing superheated steam temperatures 100°C above current operating conditions ranges between US$2,410,000 and US$11,180,000 per year. The costs and benefits of achieving higher superheated steam conditions in an individual boiler depend on local plant conditions and the price of power. However, the magnitude of the increased power that can be generated by increasing superheated steam temperatures is so great that it appears to justify the cost of corrosion-mitigation methods such as installing corrosion-resistant materials costing far more than current superheater alloys; redesigning biomassfueled boilers to remove the superheater from the flue gas path; or adding chemicals to remove corrosive constituents from the flue gas. The most economic pathways to higher steam temperatures will very likely involve combinations of these methods. Particularly attractive approaches include installing more corrosion-resistant alloys in the hottest superheater locations, and relocating the superheater from the flue gas path to an externally-fired location or to the loop seal of a circulating fluidized bed boiler.

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