Effect of Mixed Multiple Rare Earth Oxide on the Microstructure of Bioceramic Coating Prepared by Wide Band Laser Cladding

2014 ◽  
Vol 989-994 ◽  
pp. 775-778
Author(s):  
Zheng Zhang ◽  
Qi Bin Liu ◽  
Ling Yan Zhang ◽  
Hai Bin Jiang ◽  
Pei Ze Jiang
Keyword(s):  
Titanium Alloy ◽  
Rare Earth ◽  
Laser Cladding ◽  
Rare Earths ◽  
Wide Band ◽  
Rare Earth Oxide ◽  
Experimental Results ◽  
Bioceramic Coatings

In order to researching the microstructure of bioceramic coating on the surface medical titanium alloy (Ti–6Al–4V), the gradient bioceramic coatings are fabricated by wide-band laser cladding. The influence of multiple rare earths oxide La2O3 and CeO2 on microstructure of bioceramic coating were studied. The experimental results demonstrated that mixed La2O3 and CeO2 have an effect on forming-ability of HA\β-TCP in bioceramic coating and also refined the grain of bioceramic coatings. The largest amount of HA\β-TCP is presented among all the groups when the contents of La2O3 and CeO2 are 0.6wt.%, 0.4 wt.%, respectively.

The Bioactivity of Gradient Composite Bioceramic Coating with Different Contents of Multiple Rare Earth Deoxide Fabricated by Wide Band Laser Cladding

2013 ◽  
Vol 706-708 ◽  
pp. 318-322 ◽  
Author(s):  
Ling Yan Zhang ◽  
Qi Bin Liu
Keyword(s):  
Titanium Alloy ◽  
Rare Earth ◽  
Thermal Stress ◽  
Laser Cladding ◽  
Bonding Strength ◽  
Wide Band ◽  
Experimental Results ◽  
Spherical Particles ◽  
Coating Materials ◽  
Gradient Coating

To improve bonding strength between titanium alloy and coating and to eliminate thermal stress during laser cladding, a gradient coating materials is designed. And the gradient coating with different contents of multiple rare earth deoxide was produced by wide band laser cladding technique. The experimental results indicate that when addition of Sm2O3 is fixed to 0.3wt.%, as addition of Y2O3 increases, the microstructure of bioceramic is different. When addition of Y2O3 reaches 0.4wt.%, the amount of Ca-P based bioactive phases such as HA, α-TCP as well as β-TCP becomes biggest. After soaking the coating with 0.3wt.% Sm2O3 and 0.4wt.% Y2O3 in SBF for 14 days, a large amount of Ca-P white spherical particles can be observed on coating, which demonstrates the bioceramic coating is of best bioactivity.

The Bioactivity of Gradient Composite Bioceramic Coating with Two Kinds of Rare Earth Oxide Fabricated by Wide Band Laser Cladding

2014 ◽  
Vol 989-994 ◽  
pp. 767-770
Author(s):  
Pei Ze Jiang ◽  
Qi Bin Liu ◽  
Ling Yan Zhang ◽  
Hai Bin Jiang ◽  
Zheng Zhang
Keyword(s):  
Rare Earth ◽  
Laser Cladding ◽  
Wide Band ◽  
Rare Earth Oxide ◽  
Experimental Results ◽  
Addition Amount

To improve bioactivity of gradient bioceramic coating, the coating with two kinds of rare earth oxide was produced by wide band laser cladding technique. As the experimental results, whichadded0.6wt.% La2O3 fixedly, and increased the addition amount of the CeO2, when the addition of CeO2fulfill 0.4wt.%, the amount of HA-β-TCP is the largest in this experiment. Soaking the specimens in SBF for 14 days, the coating blended 0.6wt% La2O3 and 0.4wt% CeO2, then a great quantity of Ca-P white particles can be found on coating, which confirmation this bioceramic coating is of best bioactivity.

Effect of Rare Earth Y2O3 Content on Microstructure of Gradient Bioceramic Composite Coating Produced by Wide-Band Laser Cladding

2005 ◽  
Vol 288-289 ◽  
pp. 351-354 ◽  
Author(s):  
Qi Bin Liu ◽  
Long Jiang Zou ◽  
Min Zheng ◽  
Chuang Dong
Keyword(s):  
Rare Earth ◽  
Composite Coating ◽  
Laser Cladding ◽  
Dominant Role ◽  
Monosodium Glutamate ◽  
Wide Band ◽  
Experimental Results ◽  
Ti Alloy ◽  
Y2o3 Content ◽  
Rare Earth Content

In the present paper, bioceramic coating with gradient compositional design was prepared on surface of Ti alloy by using wide-band laser cladding. Effect of rare earth Y2O3 content on gradient bioceramic composite coating was studied. The experimental results indicated that adding rare earth can refine grain. Different contents of rare earth affect formation of HA andβ-TCP in bioceramic coating. With increase of rare earth content, HA andβ-TCP were synthesized. When content of rare earth ranged from 0.4% to 0.6%, the active extent of rare earth in synthesizing HA andβ-TCP got best, which indicated that “monosodium glutamate” effect of rare earth played a dominant role. However, when rare earth content was up to 0.8%, the active extent of rare earth in synthesizing HA and β-TCP conversely went down, which demonstrated that rare earth gradually lost its catalysis in manufacturing HA andβ-TCP.

Fabrication and Biocompatibility of Gradient Bioceramic Coatings on Titanium Alloy Substrate by Laser Cladding

2008 ◽  
Vol 368-372 ◽  
pp. 1203-1205 ◽  
Author(s):  
Min Zheng ◽  
Ding Fan ◽  
Xiu Kun Li ◽  
Qi Bin Liu ◽  
Wen Fei Li ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Laser Cladding ◽  
Laser Processing ◽  
Rare Earth Oxide ◽  
Processing Parameters ◽  
Alloy Substrate ◽  
Gradient Composition ◽  
Titanium Alloy Substrate ◽  
Bioceramic Coatings

Based on a high power CO2 laser beam passing by pyramid polygon mirror, the bioceramic coatings of gradient composition were fabricated on titanium alloy substrate (Ti-6Al-4V). The relations among laser processing parameters, microstructure and biocompatibility of the gradient bioceramic coatings were investigated. The results indicated that the contents of rare earth oxide additions had an immediate effect on the formation of bioactive phases. The gradient bioceramic coatings showed favorable biocompatibility in vivo after they were implanted into canine femur for 45, 90, and 180 days, respectively. The bioceramic coatings of Ca/P=1.4 and 0.6wt.% Y2O3 totally combined with new bones merely implanted for 45 days. Furthermore, the MTT (Methyl Thiazolyl Tetrazolium) colorimetry results of cell proliferation demonstrated that the cell growth distinctly increased on the gradient bioceramic coatings by laser cladding compared with the un-treated titanium alloy substrate.

The Microstructure of Gradient Composite Bioceramic Coating with Single and Multiple Rare Earth Oxide Fabricated by Wide Band Laser Cladding

2013 ◽  
Vol 341-342 ◽  
pp. 171-174
Author(s):  
Ling Yan Zhang ◽  
Qi Bin Liu ◽  
Pei Ze Jiang ◽  
Zheng Zhang
Keyword(s):  
Rare Earth ◽  
Thermal Stress ◽  
Coral Reef ◽  
Laser Cladding ◽  
Bonding Strength ◽  
Wide Band ◽  
Rare Earth Oxide ◽  
Spherical Particles ◽  
Ti Alloy ◽  
Coating Materials

To improve bonding strength between Ti alloy and bioceramic coating and to eliminate thermal stress during laser cladding, gradient bioceramic coating materials is designed. The bioceramic coating is fabricated by wide band laser cladding technique. And the effect of adding single and multiple rare earth oxide on microstructure is investigated. The samples are soaked with SBF for 14 days, the experimental results indicate that when the content of single rare earth oxide is 0.6wt.%Y2O3, a large number of bioactivity phase and chrysanthemum shape microstructure can be observed. When the content of single rare earth oxide is 0.2wt.%Sm2O3, a lot of bioactivity phase and coral reef shape microstructure can be observed. When the content of multiple rare earth oxide is 0.3wt.%Sm2O3 and 0.4wt.%Y2O3, a large amount of bioactivity phase and more homogeneous and dense spherical particles can be observed on coating, which demonstrates the microstructure is of better bioactivity.

Bioactivity of Gradient Rare Earths Bioceramic Coating Produced by Wide-Band Laser Cladding

Applied laser ◽  
2012 ◽  
Vol 32 (5) ◽  
pp. 384-389
Author(s):  
李明 Li Ming ◽  
汪震 Wang Zhen
Keyword(s):  
Laser Cladding ◽  
Rare Earths ◽  
Wide Band

Microstructure and Biocompatibility of Gradient Bioceramic Composite Coating Fabricated by Wide-Band Laser Cladding

2007 ◽  
Vol 342-343 ◽  
pp. 685-688 ◽  
Author(s):  
Qi Bin Liu ◽  
Wen Fei Li ◽  
Bang Cheng Yang
Keyword(s):  
Bone Tissue ◽  
Chronic Inflammation ◽  
Composite Coating ◽  
Laser Cladding ◽  
Transition Layer ◽  
Wide Band ◽  
Pathological Changes ◽  
Hard Tissues ◽  
Piled Structure ◽  
Bioceramic Coatings

In this study, microstructure and biocompatibility of gradient bioceramic composite coating fabricated by Wide-Band Laser Cladding is investigated. The experimental results indicate that the coating consists of an alloyed transition layer and the bioceramic coating. The bioceramic coating is mainly comprised of HA, CaTiO3, CaO, α-TCP, β-TCP and TiO. The coral-shaped structure and short-rod piled structure existing on the surface of coating. After the implantation of the bioceramic coatings into dogs’ femur for 6, 12, and 24 weeks, hypersusceptibility, rejection and pathological changes are not found. No fiber cyst, necrosis of bone tissue and chronic inflammation obviously appear through slice observation of hard tissues. The bioceramic coating with different ratios of Ca : P have different abilities to induce osteogenesis. At Ca: P=1.4 and 0.6wt.% Y2O3 (No.3 sample), the bioceramic coating is of best bioactivity and biocompatibility.

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