Study on laser in-situ synthesized TiC-TiB2/Fe composite coating and its oxidation resistance
-
Corresponding author:
LIU Qibin, qbliu2@263.net
;
-
Received Date:
2014-07-22
Accepted Date:
2014-09-11
-
Abstract
In order to improve the high-temperature oxidation resistance of materials, TiC-TiB2/Fe composite coating was in-situ synthesized by laser cladding. The data of phase, microstructure and oxidation resistance of composite coating were obtained after theoretical analysis and experimental verification. The results indicate that the phases of composite coating are mainly composed of -Fe, TiC, TiB2 and (Fe,Cr)7C3 etc. The fine block-shaped TiC particles and strip-shaped TiB2 disperse on the coating substrate uniformly. The continuous and compact oxidation film is formed on the surface of TiC-TiB2/Fe composite coating after being oxidized isothermally at 600℃ for 60h. The oxidation film consists of fine and spherical oxides such as Fe2O3, FeCr2O4, (Cr,Fe)2O3, rutile TiO2 and Al2O3 and so on, arranged closely. Thermodynamic conditions of oxide formation are satisfied. The oxidation kinetic curve of composite coating at constant temperature of 600℃ is parabolic. The rate of oxidation weight gain is much higher during the initial 10h, and then becomes slower gradually. The oxidation weight gain is 0.75mg/cm2 after being oxidized for 60h. The oxidation resistance of composite coating is 15 times higher than that of semi-steel. The results have some guiding significance to improve the high-temperature oxidation resistance of materials.
-
-
References
|
[1]
|
FU H G. Research and application of high speed steel roll [J]. China Molybdenum Industry, 2006, 30(4): 25-32 (in Chinese). |
|
[2]
|
ZHANG X W, LIU H X, JIANG Y H, et al. Laser in situ synthesized TiN/Ti3Al composite coatings [J].Acta Metallurgica Sinica, 2011, 47(8): 1086-1093 (in Chinese). |
|
[3]
|
CHEN Y Y, LI W G, WU P G. In situ synthesis tungsten carbide reinforced ferrous matrix surface composites by laser cladding [J]. Heat Treatment of Metals, 2011, 36(3): 64-67(in Chinese). |
|
[4]
|
ZHANG X W, LIU H X, JIANG Y H, et al. Microstructure of Al2O3/Ti-Al composite coatings prepared by laser aluminum thermal reduction processing [J]. Journal of Inorganic Materials, 2013, 28(9): 1033-1039(in Chinese). |
|
[5]
|
WANG X H, PAN X N, DU B S, et al. Production of in situ TiB2+TiC/Fe composite coating from precursor containing B4C-TiO2-Al powders by laser cladding [J]. Transactions of Nonferrous Metals Society of China, 2013,23(6): 1689-1693. |
|
[6]
|
HE L H, ZHOU F, YANG H Y. Research of in situ synthesis of TiC-TiB2 reinforced Co-based composite coating by laser cladding [J]. Laser Technology, 2013, 37(3): 306-309(in Chinese). |
|
[7]
|
FARID A. Processing, microstructure, properties and wear behavior of in situ synthesized TiB2 and TiC thick films on steel substrates [J]. Surface and Coatings Technology, 2007, 201(24): 9603-9609. |
|
[8]
|
ZHOU F, ZHU T, HE L H. In-situ synthesized TiC-TiB2 composite coatings prepared by laser cladding [J]. China Surface Engineering, 2013, 26(6): 29-34(in Chinese). |
|
[9]
|
JIN Y X, LI Q F. Growth elements and growth habit of coordination polyhedrons of TiC crystal in titanium alloy [J]. Journal of Inorganic Materials, 2004, 19(6): 1249-1254(in Chinese). |
|
[10]
|
GAO W L, ZHANG H, ZHANG E L, et al. Evolution characteristic of primary TiB2 solid-liquid interface morphology in solidification in TiAl-B alloys [J]. Journal of Materials Engineering, 2002(2): 19-22(in Chinese). |
|
[11]
|
YE D L, HU J H. Applied thermodynamic data-sheet of inorganic substances[M]. 2nd ed. Beijing:Metallurgical Industry Press,2002:48 (in Chinese). |
|
[12]
|
ZHU C C, HAO X D, ZHANG X H, et al. Oxidation behavior of TiC-TiB2 multiphase ceramics [J]. Materials Science and Technology, 2004, 12(1): 57-60 (in Chinese). |
|
[13]
|
LI T F. High-temperature oxidation and hot corrosion of metals [M].Beijing:Chemical Industry Press,2003: 52 (in Chinese). |
|
[14]
|
WANG H T, ZHANG G L, YU H S, et al. Effect of chromium, aluminum and silicon on oxidation resistance of Fe-based superalloy [J]. Journal of Materials Engineering, 2008 (12): 73-77 (in Chinese). |
-
-
Proportional views
-
Map
DownLoad: