The influence of nozzle design on HVOF exit gas velocity and coating microstructure

被引：9
|
作者：
Korpiola, K
Hirvonen, JP
Laas, L
Rossi, F
机构：
[1] VTT,MFG TECHNOL,ESPOO,FINLAND
[2] COMMISS EUROPEAN COMMUNITIES,JOINT RES CTR,PETTEN,NETHERLANDS
来源：
JOURNAL OF THERMAL SPRAY TECHNOLOGY | 1997年 / 6卷 / 04期
关键词：
coating microstructure; gas velocity; HVOF; HVOF nozzle design; thermal spray;
D O I：
10.1007/s11666-997-0033-5
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A simple device was constructed for determining a value for the average combustion gas velocity at the exit plane of a high-velocity oxyfuel gun. This device was used to measure the velocities of a standard factory-made barrel nozzle and a specially designed de Laval nozzle as a function of the fuel/oxygen ratio and the total mass flow rate. The Mach number of the de Laval nozzle was 1.42. The maximum combustion gas exit velocities determined for the standard and the de Laval nozzles were 1100 and 1550 mis, respectively, The maximum velocity depends on the fuel/oxygen ratio but is independent of the total flow rate. The effect of increased combustion gas velocity on coating quality is demonstrated.
引用
收藏
页码：469 / 474
页数：6
相关论文
共 50 条
  • [21] Influence of Sensitive Parameters and Flow Characteristics in HVOF Coating
    Patel, J. R.
    Agrawal, D. H.
    Patel, C. P.
    INTERNATIONAL CONFERENCE ON MODELLING OPTIMIZATION AND COMPUTING, 2012, 38 : 1367 - 1373
  • [22] Modification of Bonding Strength Test of WC HVOF Thermal Spray Coating on Rocket Nozzle
    Sofyan, Bondan T.
    Pardede, Haposan J.
    Stefano, Marizki
    Sofyan, Edi
    MAKARA JOURNAL OF TECHNOLOGY, 2006, 10 (01): : 24 - 27
  • [23] THE INFLUENCE OF THE FLOW ANGLE AT THE NOZZLE EXIT AND OF THE PRESSURE FORCES ON THE CONTOUR OF ROTATING HALLOW GAS-JETS
    FELSCH, KO
    PIESCHE, M
    ACTA MECHANICA, 1980, 35 (3-4) : 163 - 172
  • [24] Influence of particle temperature and velocity on the microstructure and mechanical behaviour of high velocity oxy-fuel (HVOF)-sprayed nanostructured titania coatings
    Gaona, M.
    Lima, R. S.
    Marple, B. R.
    JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2008, 198 (1-3) : 426 - 435
  • [25] Microstructure and Mechanical Properties of TiAlNb Coating Deposited by APS and HVOF Spraying
    Zeng, Hongjie
    Zhang, Laiqi
    He, Xinyu
    Zhang, Youcha
    Jia, Pen
    Lin, Junpin
    HIGH PERFORMANCE STRUCTURE MATERIALS, 2013, 747-748 : 139 - +
  • [26] Influence of atomiser design and coaxial gas velocity on gas entrainment into sprays
    Schelling, J
    Reh, L
    CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION, 1999, 38 (4-6) : 383 - 393
  • [27] Gas and liquid-fuelled HVOF spraying of Ni50Cr coating: Microstructure and high temperature oxidation
    Song, B.
    Pala, Z.
    Voisey, K. T.
    Hussain, T.
    SURFACE & COATINGS TECHNOLOGY, 2017, 318 : 224 - 232
  • [28] Influence of nozzle exit geometrical parameters on supersonic jet decay
    Mohanta, Prasanta Kumar
    Sridhar, B. T. N.
    Mishra, R. K.
    INTERNATIONAL JOURNAL OF TURBO & JET-ENGINES, 2023, 40 (02) : 215 - 222
  • [29] The Influence of Exit Nozzle Geometry on Sweeping Jet Actuator Performance
    Alam, Mobashera
    Kara, Kursat
    FLUIDS, 2022, 7 (02)
  • [30] Influence of initial conditions at the nozzle exit on the structure of round jet
    G. V. Kozlov
    G. R. Grek
    A. M. Sorokin
    Yu. A. Litvinenko
    Thermophysics and Aeromechanics, 2008, 15
12345