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"Pada makalah ini dibahas karakteristik lapisan WC-Co hasil proses thermal spray dengan teknik HVOF (High Velocity Oxy-Fuel) yang akan diaplikasikan pada pada nosel roket RX-10Q guna menggantikan pelapis grafit masif yang berat. Untuk itu, dilakukan studi pengaruh kekasaran permukaan terhadap kekuatan lekat dan struktur mikro lapisan.Hasil yang diperoleh menunjukkan bahwa variasi tekanan proses penyemprotan (grit blasting) menyebabkan variasi kekasaran permukaan, dimana semakin besar tekanan yang diberikan, semakin kasar permukaan yang diperoleh. Namun, kekuatan kohesi lapisan dan kekerasan lapisan WC-Co tidak dipengaruhi oleh kekasaran permukaan tersebut. Hasil penelitianjuga menunjukkan bahwa tanpa proses persiapan permukaan, lapisan WC-Co thermal spray tidak dapat melekat dengan baik pada logam dasarnya. Analisa struktur mikro lapisan WC-Co menggunakan mikroskop optik dan Scanning Electron Microscope (SEM) menunjukkan bahwa lapisan WC-Co relatifpadat dengan komposisi bervariasi pada daerah berbeda. Terdapat indikasi terjadinya difusi W pada daerah antar-fasa yang berkontribusi pada tingginya kekuatan lekat lapisan.

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This research investigated the characteristics of HVOF (High Velocity Oxy-Fuel) thermal spray WC-Co coating to be applied on the nozzle of RX-100 rocket. In particular, it studied the effects of surface preparation on the mechanical properties and microstructures of the coating.

The results showed that the grit blasting pressure directly influences the surface roughness of the substrate, in -which the greater the pressure, the higher the surface roughness. However, the cohesive strength and hardness of the coating are not affected by the surface roughness. This research also showed that without grit blasting, the WC-Co coating can not be applied on the substrate. Microstructural analysis of the WC-Co coating showed that this coating is relatively dense with variety in chemical content on different area. An indication of the diffusion of Win the interfacial area was found, which is thought to contribute to the high strength of the coating."

"Thermal spray is a coating process that provides functional surface to protect or improve the performance of a substrate or component. Almost any kind and form of material can be thermally sprayed which is why thermal spray is used worldwide to provide protection from corrosion, wear, and heat, to restore and repair components, and for a variety of other applications. This reference handbook is the complete guide to thermal spray technology. It covers principles, processes, types of coatings, applications, performance, and testing/analysis. Developed under the guidance of the Thermal Spray Society Training Committee, the handbook provides an excellent introduction and guidebook for those who are new to thermal spray. It also provides enough in-depth coverage and data that it should be of great value to specifiers and users of thermal spray coatings and to thermal spray experts who need additional background in certain areas."

"Contents : - Quo Vadis Thermal Spraying ? - HVOF-Sprayed Quasicrystal Composite Coatings for Bearing Applications - Functional Ceramic and Metallurgical Coatings on Magnesium Components - Study on Zircon-Based Ceramic Coating for High Temperature Oxidation Resistant Application - Tungsten Coatings for Divertor Wings - Double Doped Ceria Electrolyte Synthesized by Solution Plasma Spraying with Induction Plasma Technology - Replacement for Hard Chrome Plating in Printing Machinery - A contribution to Engine pistons Life Time Improving by Means of Thermal Spray Coatings - Plasma Spraying of Tin on to a Monocrystalline Lithium Fluoride Window - Fabrication and Properties of TiO2 Plioto-Catalytic Coatings by Thermal Spraying with TiO2-AI Agglomerated Powder - XRD and Rietveld Quantitative Pliase Analysis of Radio Frequency Suspension Plasma Sprayed Nano-hydroxyapatite Powders - HVOF Sprayed Hydroxyapatite Coatings: Powders' Melting State and Mechanical Properties - In Vitro Changes on High-Pressure Plasma Sprayed Hydroxyapatite (HA) Caotings - Corrosion Resistant Coatings for Gas Turbine Exhaust Stack Applications - Ceramic Abradable Coatings for Applications up to 1100°C - Production of Superplastic Foils by Thermal Spraying - The Internal Plasma Spraying on Powerful Technology for the Aerospace and Automotive Industries - A Contribution to the Production and Characterization of HVOF coatings for Application in the Petrochemical Field - Process Modelling to Optimise the Structure of Hollow Zirconia Particles for use in Plasma Sprayed Thermal Barrier Coatings - Comparative Study of Different Sealing Methods for Thick Thermal Barrier Coatings - Influence of a Multi-Gas Mixture on the on the Performance of a HPPS Plazjet System for a Thermal Barrier Coating - Effect of Bond Coat Processes and Surface Characteristics on the Failure Mechanism of Thermal Barrier Coatings - Thermal Shock Characteristics of Functionally Graded Thermal Barrier Coatings - Kinetics of Thermally Grown Oxide at Interface Between Thermal Barrier Coatings and MCrAlY Bond Coatings - Reaction Diffusion Behavior of Thermally Sprayed MCrAlY Coatings on Ni-Based Super Alloys - Optimization of Shop Practices for Thermal Barrier Coatings - Removal of Thermal Barrier Coatings from Turbine Blades: A Comparison of Machanical and Chemical Methods - Induction Plasma Synthesis of MoSi2 Ultrafine Powders - Improvements in HVOF Sprayed Cermet Coatings Produced from SHS Powders - Composites Made of Metal Foams With Thermally Sprayed Coatings - Plasma Spray Dissociation ZrSiO4 As The Basis of Forming ZrO2-Mullite Composites from a ZrSiO4 + AI2O3 Mixture - HVOF Sprayed Hydroxyapatite/Titania Composite Coatings - Manufacture of SiC Composite Coatings by HVOF - Hight Temperature Behaviour of Plasma Sprayed ZrB2-SiC Composite Coatings - Abradable Coatings for Low-Temperature Applications - Developments of Plasma Sprayed Ceramic Coatings - Properties of Al203 coatings sprayed by HFPD - On the Tailoring of Spray Dried Thermal Spray Powders - Spray Powders and Coatings on the Basis of Titanium Suboxides - A Comparative Study of the Deposition of Chromium Carbide Based Metal Matrix Composites by Axial Plasma Spray, Air Plasma Spray and High Velocity Oxygen Fuel - Heating Effect of Flame Impingement on polymer Coatings - Mechanical Properties of Thermal Spray PEEK Coatings - Characterization and Mechanical Properties of Flame Sprayed Hydroxyapatite/Polymer Composite Coatings - Structure and Thermal Conductivity of Flame Sprayed Polyamide 11 Coatings Filled with AI2O3, AIN and BN Ceramics - Surface Modification of Recycled PET Plate by Particle Implantation and Deposition with Plasma Spraying - Sprayed Composite Coating of High Performance Thermoplastics - Processing and Characterization of Nanostructured Cermet Coatings - Synthesis and Properties of Multimodal WC-12 Co Coatings - Structure and Properties of HVOF Sprayed Amorphous Polymer Matrix Nanocomposite Coatings - Properties of HVOF Sprayed Multi-Scale Polymer/Silica Nanocomposite Coatings - Control of the Injection of an Alumina Suspension Containing Nanograins in a dc Plasma - Cold Sprayed Nanostructured WC-Co - Low Pressure Plasma Spraying of Sol-Gel Al203/SiC Nanocomposite Coatings - Effects of Shock Waves on Impact Velocity of Cold Spray Particles - Optimization of the Cold Spray Process - Kinetic Powder Compaction Applying the Cold Spray Process A Study on Parameters - Experimental Study of Interaction of Supersonic Gas Jet With a Sub"

"This proceedings volume representing the second International Thermal Spray Conference (May 2004, Osaka, Japan) contains 232 papers and 93 poster presentations. Arrangement is in sections on applications, characterization methods for coating properties, coating technologies for vehicle engines, cold spray, consumables for thermal spraying, corrosion protection, economics and quality, HVOF processes and materials, innovative equipment and process technology, modeling and simulation, nanostructured materials, photocatalytic materials, process diagnostics, protective coatings against wear and erosion, and thermal barrier coatings."

"Contents : - Numerical and Microstructural Investigations of the Bonding Mechanisms in Cold Spraying - High Strain Rate Deformation Phenomena in Explosive Powder Compaction and Cold Gas Spraying - Optimizing the Cold Spray Process - Modeling of Particle-Substrate Adhesive Interaction Under the Cold Spray Process - A Systematic Approach to Material Eligibility for the Cold Spray Process - Particle-Substrate Interactions in Cold Gas Dynamic Spraying - Evaluation Of Coatings Produced Via Kinetic And Cold Spray Processes - Potential Applications of Cold-Spray Technology in Automotive Manufacturing - Development of Cold Gas Sprayed Coatings - Cold Spray Copper Application for Upper Stage Rocket Engine Design - Kinetic Spray of Aluminum Metal Matrix Composites For Thermal Management Applications - Effect of Spray Angle on Deposition Characteristics in Cold Spraying - Cold Spraying – Equipment and Application Trends - Automated Cold Spray System: Description of Equipment and Performance Data - Helium Recovery: Design Considerations for Cold Spray Systems - Cold Spray Technology: An Industrial Perspective - Production Coating Cost Comparison - Thermal Spray Solutions For Diesel Engine Piston Rings - Low-Cost High-Performance Coatings Produced by Internal Plasma Spraying for the Production of High Efficiency Engines - Development of Thermal Spray for Automotive Cylinder Bores - 316L – an Alternative to NiCr Bondcoats for Cr2O3-Coatings on Anilox Rolls - Plasma-Sprayed Ceramic Coatings for Molten Metal Environments - Influence of Powder Size in Aluminum Oxide Coatings for Use in the Semiconductor Industry - Intermediate Temperature SOFC Based on Fully Integrated Plasma Sprayed Components - Investigation of the Photocatalytic Efficiencies of Plasma Sprayed Tio2-Fe3O4 Coatings - Protection of Titanium Alloy Surfaces by Thermal Spraying and Laser Treatment - Fabrication of TiO2 Photocatalytic Coatings on PET by Thermal Spraying - Photocatalytic Decomposition of Ammonia by Thermal Sprayed TiO2 Coatings - Optimization of Axial Injection Conditions in a Supersonic Induction Plasma Torch: Application to SOFCs - Methodology for Meeting Standards and Environmental Requirements in Thermal Spraying Hardfacing and Sand Blasting Erosion Resistance of Arc Spray Composite Coatings at High Temperature on Boiler Tubes of Pulverized Coal Fired Power Station - Assessing the Feasibility of Using Diamond as a Reinforced Phase in Metal Matrix Composite Coatings - New Carbide Based Materials for HVOF Spraying - Advanced Oxide Ceramic Coatings for Applications Demanding High Wear Resistance - Development and Application of WC-Cr3C2-Ni Coating with High Impact Resistance - Preparation and Characterization of Powders and Coatings Containing Solid Lubricants - Properties of Plasma and D-Gun Sprayed Metal-Matrix-Composite (MMC) Coatings Based on Ceramic Hard Particle Reinforced Fe-, Ni-aluminide Matrix - Ceramic Coating of Alloy 625 using Controlled Atmosphere Plasma Spraying for Sea Water Corrosion Protection - The Influence of Matrix Phase Viscosity on the Plasma-Spray Deposition Of Silicon-Nitride Composite Coatings - Influence of Rare Earth Elements on the Corrosion Resistance of Fe-Cr-Ni Thermal Sprayed Coatings - Process Temperature-Hardness-Wear Relationships for HVOF-Spraye Nanostructured and Conventional Cermet Coatings - A Parametric Study of an HVOF Process for the Deposition of Nanostructured WC-Co Coatings - Abrasion and Sliding Wear of Nanostructured Ceramic Coatings - Fatigue and Fracture Resistance of Nanostructured Composite System: Chrome Carbide – Hard Oxide Aluminum – Aluminum - Abrasion Wear Behaviour of Plasma and HVOF Sprayed Al2O3-SiC Nanocomposite Coatings - Effect of Powder Composition on the Microstructure and Wear Properties of Sprayed Cast Iron Coatings - Influence of Thermal Spray Process on the Corrosion Behavior of High-Density - Stainless Steel Coatings in Simulated Marine Environment - A New Spray Coating Process for Manufacture of Stainless Steel Clad Construction Steel with Resistance to Corrosion by De-icing Salts & Seawater - HVOF Reactive Spraying of Mechanically Alloyed Ni-Ti-C Powders - Marine Exposure Tests of Thermal Sprayed Coatings in Japan - Development of Dense Corrosion Resistant Coatings By an Improved HVOF Spraying Process - Protection of Steel Components Against Marine Corrosion by Thermally Sprayed Anodic Coatings - Development and Implementation of HVOF WC/Co/Cr Coating as Alternative to Electrolytic Hard Chrome Plate in Landing Gear Applications"

"ABSTRAKTelah dilakukan penelitian tentang Pembuatan dan Karakterisasi lapisan JK7112yang dibuat dengan proses HVOF Thermal spray Coating. Sampel diteliti ukuranbutir,struktur kristal,pertumbuhan butir dan perubahan struktur yang akanmenentukan sifat mekanik seperti kekerasan.Pengujian dilakukan dengan ScaningElectron Microscop(SEM),Vickers Hardness tester dan X-RayDifraction(XRD).Hasil yang diperoleh bahwa setelah sample dipanaskan sampaisuhu 600oC ,maka kekerasan lapisan bertambah dan terjadi perubahan phasekristal."

"Masalah umum yang terjadi pada komponen logam adalah keausan. Proses pelapisan thermal spray high velocity oxygen fuel (HVOF) adalah salah satu metode thermal spray yang relatif paling maju dari segi teknologi dan hasil lapisan yang mampu menghasilkan lapisan dengan ketahanan aus yang tinggi. Kelebihan yang dimiliki metode pelapisan thermal spray high velocity oxygen fuel (HVOF) antara lain adalah lapisan yang memiliki densitas yang tinggi, oksidasi lapisan yang rendah, rentang penggunaan serbuk lapisan yang relatif banyak dan ikatan adhesif yang tinggi.Pada penelitian ini, baja paduan tube ASTM A 213 T91dan baja karbon JIS G3132 SPHT-2 dilakukan grit blasting dilanjutkan dengan pemanasan permukaan pada temperatur 50 °C, 100 °C dan 150°C dengan menggunakan torch. Selanjutnya dilakukan proses thermal spray high velocity oxygen fuel (HVOF) dengan serbuk pelapis CrC-25%NiCr Orlikon Metco. Karakterisasi hasil lapisan dan daerah antarmuka difokuskan pada struktur mikro, tingkat porositas, distribusi kekerasan dan laju keausan spesifik.Hasil yang ditemukan bahwa pelapisan CrC-25%NiCr meningkatkan kekerasn masing-masing substrat 120-220 VHN menjadi 500-800 VHN. Selain itu nilai laju keausan spesifik juga menurun dari 1,66 x 10-6 mm3Kgf-1m-1 menjadi berkisar 7 x 10-8 mm3Kgf-1m-1. Peningkatan temperatur substrat sebelum penyemprotan dapat menurunkan persentase porositas pada lapisan HVOF dan dapat mempengaruhi nilai distribusi kekerasan dan keausan lapisan.

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One of the general problem of metal part is wear. Thermal spray high velocity oxygen fuel (HVOF) coating process is one of most advance coating methode for its technology and the high quality of coating, resulting in high wear ressistance coat. The advantages of thermal spray high velocity oxygen fuel (HVOF) are high density coat, low oxidation coat, wide range of usable coating materials and high adhesive bond strength.

In this study, alloy steel tube ASTM A 213 T91 and low carbon steel JIS G3132 SPHT-2 blasted with alumina and heated for 50 °C, 100 °C dan 150°C. Then the substrate was sprayed with CrC-25%NiCr Orlikon Metco coating in the process of thermal spray high velocity oxygen fuel (HVOF) methode. The characterization focused on microstructure of coating interface, porosity, hardness distribution and spesific wear rate.

It was found that CrC-25%NiCr coating enhace surface hardness from 120-220 VHN to 500-800 VHN. Moreover CrC-25%NiCr coating decrease the value of spesific wear rate from 1,66 x 10-6 mm3Kgf-1m-1 to 7 x 10-8 mm3Kgf-1m-8. It was found that the increasing of substrate temperature could decrease coating porosity and affects coating hardness and spesific wear rate."

"Salah satu cara untuk mengurangi berat struktural roket RX-100 adalah dengan memodifikasi material dan proses pembuatan nosel. Nosel dipilih sebagai sasaran pengurangan berat karena nosel menyumbang 30 % dari keseluruhan berat struktur.Salah satu cara untuk mengurangi berat nosel adalah dengan mengganti lapisan grafit masif, yang digunakan sebagai pelindung panas, dengan lapisan WC (Tungsten Carbide) yang diaplikasikan dengan teknik HVOF (High Velocity Oxigen Fuel) thermal spray.Pada makalah ini akan dibahas karakteristik dasar dari material nosel yang dipakai saat ini. Selain itu, juga akan dibahas modifikasi pengujian kekuatan lekatan lapisan, guna memperoleh alat bantu untuk mempermudah pengujian tanpa mengorbankan tingkat presisi.Hasil penelitian menunjukkan bahwa material yang dipakai sebagai nosel roket RX-100 adalah baja S45C. Modifikasi alat bantu pengujian kekuatan lekat lapisan dilakukan dengan menambahkan rantai, yang meningkatkan fleksibilitas dan kemudahan pengujian tanpa mengorbankan tingkat presisi.

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Modification of Bonding Strength Test of WC HVOF Thermal Spray Coating on Rocket Nozzle. One way to reduce structural weight of RX-100 rocket is by modifying the nozzle material and processing. Nozzle is the main target in weight reduction due to the fact that it contributes 30 % to the total weight of the structur.An alternative for this is by substitution of massive graphite, which is currently used as thermal protector in the nozzle, with thin layer of HVOF (High Velocity Oxy-Fuel) thermal spray layer.This paper presents the characterization of nozzle base material as well as the modification of bonding strength test, by designing additional jig to facilitate testing processes while maintaining level of test accuracy.The results showed that the material used for RX-100 rocket nozzle is confirmed to be S45C steel. Modification of the bonding strength test was conducted by utilizing chains, which improve test flexibility and maintains level of accuracy of the test."

"Pada penelitian ini akan dilakukan dengan pembuatan lapisan woka 3202 pada substrat sehingga memiliki kekerasan maksimal dan porositas yang kecil dengan menggunakan High Velocity Oxi-Fuel (HVOF) Thermal spraying dan di lakukan tempering dengan suhu tetap dan waktu temper dibuat yang bervariasi. Data hasil dari lapisan ini diuji kekerasannya dengan menggunakan uji kekerasan mikro vickers dan ukuran diameter butir grain pada lapisan woka 3202, dianalisa secara mikrostruktur bagaimana perubahan stuktur butiran sebelum dan sesudah dilakukan temper yang waktunya bervariasi dengan menggunakan, mikroskop optik, XRD dan SEM sehingga akan diperoleh hasil yang diharapkan oleh dunia industri."