Plasma electrolytic carbo nitriding

transcript

PLASMA ELECTROLYTIC CARBO NITRIDING

Guided By,

JUSTIN THOMAS

Assistant Professor

Mechanical Department

Presented By,JOHN JOSEPHS7 MechanicalRoll No: 25GECI.

SEMINAR ON

CONTENT

INTRODUCTIONPLASMACARBURIZINGNITRIDING AND CARBONITRIDINGCASE STUDYAPPLICATION CONCLUSIONREFERENCE

INTRODUCTION

Need of hardening

Types of hardening processes

Surface hardening process

PLASMA

PLASMA FORMATION

Fourth state of matter

Collection of nuclei and free electron

Affected by magnetic and electric field

Two types of plasma – natural and artificial

Electric discharge in mediumPower source- DC, RF, microwave

CARBURISING

Heat treatment processHeated in presence of carbon bearing

materialsUsed in low carbon steel or low carbon

alloysIncrease in hardnessIncrease in wear resistance

CARBONITRIDING

Carbon and nitrogen diffuses interstitiallyHigher hardness than carburised caseAlso known as: dry cyaniding, gas cyaniding and nicarbing

APPLICATIONGear teethCam shaftBearingsFastnersPinsHydraulic pistons

PLASMA ELECTROLYTIC CARBO NITRIDING OF ALUMINIUM

EXPERIMENTAL STUDY

Cathode - pure aluminium plate Anode- stainless steel container Electrolyte- aqueous solution of glycerol and carbamide DC power supply 150Hz and duty cycle 45% Electrolyte temperature 350

VOLTAGE CURRENT CHARACTERITICS

MICRO STRUCTURE

Micro cracks

Micro channels

PHASE CONSTITUENT LAYERS

Depth of 2µmContains

Aluminium carbide

Aluminium nitride

Aluminium carbonitride

COMPOSITION OF CONSTITUENTS

DIFFUSED REGION

Carbon increases

Nitrogen increases

Al decreases

CORROSION BEHAVIOR

Corrosion current density = 6.85 x 10-7

1/20th of bare aluminium

IMPEDENCE OF ALUMINIUM SUBSTRATE

Corrosion impedance increases

INDUCTIVE LOOP

PLASMA ELECTRO CARBO NITRIDING OF TITANIUM CARBONITRIDES(TiCxN1−x)

EXPERIMENTAL STUDY

Cathode - Titanium disk

Anode - Graphite rod

Electrolyte - Organic solution

DC power supply - 400v, 100hz, duty cycle 30%

Electrolyte temperature- 300

SURFACE MORPHOLOGY

PLASMA ELECTROLYTIC CARBO NITRIDING 18

COMPARISON OF MICRO HARDNESS

Hardness increases about two times

CORROSION RESISTANCE

Corrosion potential of coating increases about 400mV

Current density decreases

BIO COMPACTIBILITY OF CALCIUM-TITANIUM CARBONITRIDE

CELL EXPERIMENT

Osteoblast cell tissue cultured in medium Absorbance of cells measured by micro plate reader Treated titanium contain more cells Cells placed in well plates of titanium alloy and bare titanium

ADVANTAGES

For hardening gear tooth

High surface hardness

Increases tensile strength and yield point

Increases fatigue life by about 30 to 100%

Good for high temperature application

Used for metals with low melting point

ADVANTAGES Continuation

Carried out at low temperature

Lesser time for treatment

Reduced distortion due to low temperature

Any complex parts can be treated

Hardened with out considerable dimensional change

APPLICATION AREAS

Aircraft industry

Defence

Electronic industry - Integrated chips

Internal combustion engine and compressor

CONCLUSION

The carbonitrided layer on aluminium contains AL4C3, ALN and AL7C3N3 phases.

PEC/N treatment greatly improves the corrosion resistance of pure aluminium.

Bio compatibility increases when calcium treated with titanium Hardness value increases Low melting point materials can be successfully treated with

pec/n process

REFERENCE Jie Wu,Yifan Zhang , Run Liu, Bin Wang, Ming Hua, Wenbin Xue Anti-corrosion Layer

Prepared By Plasma Electrolytic Carbonitriding On Pure Aluminium International journal of applied surface science

Xudong Wang, Xin Pan, Wenting Ye, Yanlin Wei, Yashao Chen Preparation and properties of TiCxN1−x coatings containing calcium on titanium surface by plasma electrolytic carbonitriding.International journal of surface coating and technology

YongkunQin , DangshengXiong, JianliangLi , RajneeshTyagi Corrosion and bio-tribological properties of Ti(CN)x hard coating on titanium alloy by the pulsed plasma electrolytic carbonitriding process.Tribology international

S.A. Kusmanov , A.A. Smirnov, S.A. Silkin, V.I. Parfenyuk, P.N. Belkin Plasma electrolytic nitriding of alpha- and beta-titanium alloy in ammonia-based electrolyte. International journal of surface coating and technology

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Plasma electrolytic carbo nitriding

Engineering