Wear and high temperature oxidation behaviour of wire arc sprayed iron based coatings

Li, R.; He, Dingyong; Zhou, Zheng; Wang, Z. J.; Song, Xiaoyan

doi:10.1179/1743294414y.0000000331

Cited by 37 publications

(11 citation statements)

References 24 publications

(30 reference statements)

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“…Таким образом, наиболее термодинамически вероятными в условиях дуговой наплавки проволокой, в состав которой наряду с оксидом вольфрама вводится алюминий, являются реакции (12) и (14). К ним примыкают как конкурирующие реакции (6), (5). Поскольку в результате реакций (12) и (14) в качестве продукта окисления алюминия образуется Al 2 O(г), то можно рассчитывать на отсутствие неметаллических включений Al 2 O 3 (тв) в наплавленном металле.…”

Section: результаты и их обсуждениеunclassified

Some Thermodynamic Aspects of Wo3 Reduction by Aluminum

Крюков

Бендре

Горюшкин

et al. 2019

Izv. vysš. učebn. zaved., Čern. metall.

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Technology of arc surfacing using flux cored wire, in which tungsten oxide (WO3) and aluminum are used as fillers, is of interest for practical application in order to save tungsten. Thermodynamic estimation of probability of 14 reactions between them under standard conditions was carried out using tabular thermodynamic data of reagents in temperature range 1500 – 3500 K. This interval includes temperature at the drop surface on the electrode at time of separation, so are temperatures at the arc periphery and in the upper layers of surfacing bath. The following states were considered as standard states for reagents: WO3(solid), WO3(liquid), WO3(gas); Al(ref), Al(liquid), Al(gas), Al2(gas), and as possible reaction products and standard states for them: W(ref), W(liquid), W(gas), Al2O3(solid), W; Al2O3(liquid), AlO(gas), AlO2(gas), Al2O(gas), Al2O2(gas). Reduction reactions of the oxide were recorded at 1 mole O2 . Probability of reactions was evaluated using standard Gibbs energy of reactions. Calculations were carried out in four stages. Aggregate states of oxide, metal and structure of aluminum vapor, in which oxide and metal have the greatest chemical affinity for each other were established on the first and second stages. At the third and fourth stages, the most probable state was determined for metallic tungsten and the most probable composition, and aggregate state of aluminum oxide formed as a result of alumothermy of Al2O3(solid, liquid); Al2O3(liquid); AlO(gas); AlO2(gas); Al2O(gas); Al2O2(gas). According to Al – W system state diagram, there are a number of intermediates between tungsten and aluminum: W2Al, WAl3 , WAl4 , WAl5 , WAl7 , WAl12 ; however, a search for thermodynamic properties for them shows that data are available only on melting pattern (congruent or in-congruent) and temperature of transformation. No other thermodynamic data. At the same time, based on results of our previous work on restoration of tungsten oxide by carbon and silicon, it can be predicted that aluminides of a free-frame will necessarily be formed. Performed thermodynamic analysis shows that presence in flux-cored wire used for surfacing, along with tungsten oxide WO3as an aluminum reducing agent, will necessarily lead to occurrence of reduction reactions with formation of tungsten aluminides, and possibly tungsten itself. Tungsten oxide has the highest reactivity, being in state of WO3(gas). Aluminum itself has the highest chemical affinity for WO3(gas) in form of Al2(gas) and Al(gas). Al2O(gas) appears most likely as an oxidation product of aluminum.

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Section: результаты и их обсуждениеunclassified

Some Thermodynamic Aspects of Wo3 Reduction by Aluminum

Крюков

Бендре

Горюшкин

et al. 2019

Izv. vysš. učebn. zaved., Čern. metall.

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“…Ni-based coatings are preferred due to their outstanding properties in high temperatures to prevent sulfidation and oxidation of the substrate. However, due to the high production cost, Fe-based coatings are increasingly being developed by adding alloying elements and ceramic particles to substitute the Ni-based coatings [8,[12][13][14]. Fe-based coatings can replace Ni-based coatings because of good mechanical properties, low density, low cost, and availability of raw materials.…”

Section: Introductionmentioning

confidence: 99%

“…Fe-based coatings can replace Ni-based coatings because of good mechanical properties, low density, low cost, and availability of raw materials. Li et al [12] prepared arc-sprayed FeCrSiB and observed that adding Si and B elements reduced the oxide inclusions and increased hardness in the coating compared with NiCrTi and FeCr. Table 1 shows a comparison of properties for arc-sprayed Fe-based and Ni-based coatings.…”

Section: Introductionmentioning

confidence: 99%

A Review on the Wear, Corrosion and High-Temperature Resistant Properties of Wire Arc-Sprayed Fe-Based Coatings

et al. 2021

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Among different thermal spraying methods, arc-spraying has been widely used due to its low operating costs and high deposition efficiency. The rapid progress of cored wire technology in arc-spraying has increased possibilities for the preparation of new Fe-based coating materials with enhanced properties by adding reinforcement particles and alloying elements to suit the different applications. Fe-based coatings have been extensively used because of their high strength, toughness, lower production costs, and availability of raw materials. This makes them suitable replacements for Ni-based coatings in ambient and high-temperature applications. This review discusses the research status and developments of the arc-sprayed Fe-based coatings. The study specifically reviews the wear behavior, corrosion analysis, and high-temperature resistant properties of arc-sprayed Fe-based coatings, aiming to develop an understanding of the protection mechanisms for Fe-based coatings. The performance of the Fe-based coatings depends on the integrity of the coating structure. Optimizing arc-spraying parameters minimizes defects (pores, grain boundaries, unmelted particles, oxides, and microcracks) that deteriorate the coating properties. High amorphous phase content, ceramic reinforcement particles and alloying elements enhance the corrosion, tribological, and high-temperature resistant properties of Fe-based coatings. In high-temperature applications, Fe-based coatings form oxide scales that protect the coating from further oxidation; thus, it is important to select the optimum composition for the alloying elements.

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“…Many scientists have studied composite hardfacings with Ni, Co and Fe based matrixes [6 -8]. Fe-based composite hardfacings are favoured due to their low price [9,10].…”

Section: Introduction mentioning

confidence: 99%

Wear Resistance of Sintered Composite Hardfacings under Different Abrasive Wear Conditions

Simson

Kulu

Surženkov

et al. 2017

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The article focuses on vacuum liquid phase sintered (PM) composite hardfacings and their behaviour under different abrasive wear conditions. Hardfacings studied contained 30 -50 vol % fine, coarse or multimodal (fine and coarse) hardmetal reinforcement. For wear resistance studies, we used the Abrasive Rubber Wheel Wear (ARWW) test as a threebody abrasive wear test, the Abrasive Wheel Wear (AWW) test as a two-body abrasive wear test and the Abrasive-Impact Erosion wear (AIEW) test as an abrasive-erosive wear test. Tested materials were compared to Hardox 400 steel and CDP112 wear plate (Castolin Eutectic® Ltd.). It was found that under three-body abrasion conditions (ARWW test) hardfacings with high content of spehrical coarse reinforcement are suitable; their wear resistance is about two times higher than that of unreinforced hardfacings. Under two-body abrasive wear (AWW test), hardfacings with a high content of coarse reinforcement are recommended; their wear resistance is up to eight times higher than that of unreinforced hardfacings from the figures and graphs mentioned in the text. Under abrasive-erosive wear (AIEW test), unreinforced ductile materials are recommended; they have two to three times higher wear resistance than composite hardfacings reinforced with fine or multimodal reinforcement.

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Wear and high temperature oxidation behaviour of wire arc sprayed iron based coatings

Cited by 37 publications

References 24 publications

Some Thermodynamic Aspects of Wo3 Reduction by Aluminum

Some Thermodynamic Aspects of Wo3 Reduction by Aluminum

A Review on the Wear, Corrosion and High-Temperature Resistant Properties of Wire Arc-Sprayed Fe-Based Coatings

Wear Resistance of Sintered Composite Hardfacings under Different Abrasive Wear Conditions

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