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Fabrication and Microstructure of CaTiO_3 Coating by laser cladding

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Journal of Wuhan University of Technology(Materials Science) 2011年第6期26卷 1093-1097页

作者：吕晓卫黄卫东 State Key Laboratory of Solidification Processing Northwestern Polytechnical University

In order to explore the way to improve the adhesion of the calcium phosphate bioceramic coating to Ti substrate, the CaTiO3 coating was fabricated on Ti substrate by laser cladding （LC） using powders of CaCO3 and CaHPO4, and then the composition and microstructure of the coatings were investigated. During LC, CaCO3 can hardly react with Ti, and the coating fabricated using CaCO3 powder is mainly composed of the process of CaO, the decomposition product of CaCO3. Moreover, the coating has a loosened structure and part of it has peeled off from the substrate. CaHPO4 reacts vigorously with Ti, and the coating fabricated using CaHPO4 mainly consists of CaTiO3 which is one of the reaction products between Ti and CaHPO4. Chemical bonding is formed at the interface between coating and substrate, which may enhance the adhesion of the CaTiO3 coating to Ti substrate. Furthermore, CaTiO3 dendrite and eutectic of CaTiO3 and Ca2P2O7 are found on the surface of the coating, implying that a transition can be formed between CaTiO3 and some calcium phosphate bioceramic. So CaTiO3 coating fabricated using CaHPO4 can be a potential candidate to improve the adhesion between calcium phosphate coating and Ti substrate. However, there are also pores and cracks existing in the coating, which may degrade the mechanical properties of the coating.

关键词： CaTiO3 coating CaCO3 CaHPO4 Ti substrate laser cladding

Analysis of Stress and Strain Fields of laser cladding Process on Ring Circular Orbit

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Journal of Shanghai Jiaotong university(Science) 2011年第3期16卷 296-301页

作者：张平马琳原津萍蔡志海 Science and Technology Laboratory on Remanufacturing Academy of Armored Force Engineering Institute of Chemical Defense

The cracking of coatings and the deformation of base frustrate the application of laser cladding technology especially on surface of the ring circular *** order to solve the two problems above,the stress and strain fields of the laser cladding process on the ring circular orbit were analyzed through the finite-element method,based on the temperature *** wedge module of the ring circular ring was the subject investigated. The calculating results show that during the cladding process the crank point tends to generate the transversal crack;the centre point on the coating/base interface tends to generate longitudinal crack;the intersecting edge of the coating and base tends to generate toe ***,the cracking tendency of the outer marginal point is obviously greater than that of the inner marginal *** rather high stress appears at the border position where the constraint exists,and the stress on the point in front of molten pool under the range of laser irradiation is large as *** the displacement becomes larger as the cladding process proceeds.

关键词： laser cladding circular orbit stress and strain field

Microstructure and performance of laser cladding TiB_2 and Nickel-coated graphite composite coating on stainless steel 9Cr18

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Journal of Harbin Institute of Technology(New Series) 2006年第3期13卷 307-310页

作者：应丽霞王黎钦郑德志贾晓梅齐毓霖 School of Mechatronics Engineering Harbin Institute of Technology Harbin 150001China

The antiwear and antifriction coating, which contains TiB2 and Nickel-coated graphite, has been obtained on stainless steel 9Cr18 by laser cladding. The processing method, microstructure, interface, microhardness, tribological properties and the forming mechanisms of the coating are analyzed. Results show that the microstructure of the clad coating are mainly long plume-like primary phase sosoloid Ni-Fe which form the matrix framework, while the in-situ anomalous synthetical TiC grains and uhrafine TiB2 grains uniformly disperse among the framework. The hardness and wear resistance of the coating has been greatly improved, which can be attributed to the reinforcement mechanism of TiC, TiB2, FeC, Fe3C and Cr23 C6. etc. At the same time, the coating has friction-reducing ability.

关键词： laser cladding TiB2 Nickel-coated graphite microstructure

Microstructure and wear behavior of laser cladding Ni-based alloy composite coating reinforced by Ti(C,N) particulates

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China Welding 2008年第3期17卷 20-23页

作者：齐勇田施瀚超邹增大胡丽萍 School of Materials Science and Engineering Shandong University Inner Mogolia Institute of Metals and Materials

In this paper, Ni-based alloy composite coating reinforced by Ti （C, N） particles was fabricated on the mild steel through laser cladding technology. The microstrncture of laser cladding layer was analyzed by means of optical microscopy （OM）, X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The wear resistance test of the coating was evaluated using an M-2000 tester. The results showed that the Ni-based composite coating had an ability of rapid solidification to form dendritic crystals microstructure consisting of Ti （ C, N） particulates uniformly distributed in the matrix. It was found that some Ti（ C,N） particles are similar to be round in shape, and the others are irregular. laser cladding layer reinforced by Ti（ C, N） particulates was found to possess good wear resistance property.

关键词： laser cladding Ti (C N) property of wear resistance

Microstructures and properties of Fe-Co-B-Si-Nb coating prepared by laser cladding and remelting

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China Welding 2011年第1期20卷 54-58页

作者：朱彦彦黄坚李铸国李瑞峰 Shanghai Key Laboratory of Materials laser Processing and Modification School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240

High power laser cladding of [ （ Fe0. 5 Co0. 5 ） 0. 75 B0. 2 Si0.05 ] 95. 7 Nb4. 3 powder mixture afier-remelting was performed to fabricate Fe-based metallic glass coating on the surface of steel of China Classification Society： Grade B （CCS-B）. Scanning electron microscopy （SEM）, X-ray diffraction （XRD）, transmission electron microscopy （TEM） with energy dispersive spectrometer （EDS）, Vickers hardness tester and corrosion resistance tester were employed to characterize microstructures and evaluate properties of this coating. According to the results of SEM, XRD and TEM, the cladding coating consisted of nanocrystalline embedded in amorphous phase. EDS data indicated that Nb segregated in the amorphous matrix. The results of hardness test revealed that the hardness of the top layer was higher than that of the inner layer of the coating. The coating exhibited excellent corrosion resistance in a 3.5% NaCl solution.

关键词： laser cladding laser remelting amorphous metallic coating microstructure

Microstructure & performance of laser cladding on pick surface of coal mining machine

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Journal of Coal Science & Engineering(China) 2006年第2期12卷 97-99页

作者：孙会来赵方方张守新齐向阳 School of Mech.and Electr.Engineering Tianjin Polytechnic UniversityTianjin 300160China Fangezhuang Mining Branch Kailuan Clean Coal Co.Ltd.Tangshan 063109China

laser cladding of 316 L steel powders on pick substrate of coal mining machine was conducted, and microstructure of laser cladding coating was analyzed. The micro-hardness of laser cladding coating was examined. The results show that microstructure of laser cladding zone is exiguous dentrite, and there are hard spots dispersible distribution in the laser cladding zone. Performances of erode-resistant, surface micro-hardness and wear-resistant are improved obviously.

关键词： laser cladding coal mining machine pick microstructure micro-hardness wear-resistant

Microstructure and mechanical property of laser cladding Fe-based alloy composite coating reinforced by Ti （ C0.3 No. 7 ） particulates

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China Welding 2012年第3期21卷 17-21页

作者：齐勇田曹润平曹朝霞邹增大 Department of Materials Engineering Inner Mongolia Baotou Vocational and Technical CollegeBaotou014030 School of Materials Science and Engineering Shandong UniversityJinan250061

Fe-based alloy coatings reinforced by Ti（ C, N） particles was produced through CO2 laser cladding technology. The microstructure of laser cladding coating was analyzed by means of X-ray diffraction （ XRD ）, transmission electron microscopy （TEM） , selected area electron diffraction （ SAED ） , scanning electron microscopy （SEM） and electron probe microscopic analyzer （ EPMA ）. The mechanical property of the layer was measured by using microhardness meter. The results show that Ti （ C0. 3 N0. 7 ） panicles are introduced by an in-situ metallurgical reaction between TiN particle and graphite powder during laser cladding process. Titanium carbonitrides particles existed in the layer are fairly fine, ranging from 0. 1 μm to 5.0 μm, and evenly dispersed in the metal α-Fe matrix. Most of them take on nearly rhombus shape, and some of them are irregular in shape. The microhardness of laser cladding layer ranges from 770 HV0. 3 to 850 HV0. 3.

关键词： Ti (C0.3 N0.7 ) TiN in-situ formation laser cladding microhardness

Ceramic-Metal Composite Coating by laser cladding

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Journal of Iron and Steel Research International 1996年第2期3卷 28-34页

作者： Wang Pengzhu Qu Jinxing Shao Hesheng Beijing Graduate School China University of Mining and Technology Beijing 100083 China

Four kinds of ceramics (silicon carbide, boron carbide, aluminum oxide and tungsten carbide) were added into Ni base self-fluxing alloy as reinforcing materials in order to obtain metalceramic composite coating by means of laser cladding. A lot of experiments have been carried out to test the processability of the four kinds of ceramics with different sizes and contents. The microstructures of sintered tungsten carbide (S-WC) and cast tungsten carbide (C-WC) reinforced Ni base alloy coatings were analysed, the distortion regulation of laser clad specimens was revealed. The wear resistance of the composite coating has been tested.

关键词： composite coating ceramic reinforcement laser cladding

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Ferrous Alloy Powder for laser cladding

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Journal of Wuhan University of Technology(Materials Science) 2005年第1期20卷 57-59页

作者：温家伶

This investigation aimed at how to improve the hardness and wear resistance by B , Si and Cr, and how to improve the synthesis property by Re (rare-earth elemen t). Based on the experiment of Fe-based alloys of Fe-Cr-Ni-B-Si-Re, throug h experiments and a serious of synthesis analysis, including surface quality, sp ectrum composite, micro-hardness, scanning electron microscopy, as well as the synthesis evaluation,etc, prescriptions were optimized. As a result, a Fe-Cr- Ni-B-Si-Re cladding material with a high property was obtained.

关键词： laser cladding microstructures alloy hardness