A Feasibility Study of LENS® Deposition of CoCrMo Coating on a Titanium Substrate

2008 ◽  
Vol 130 (2) ◽  
Author(s):  
G. D. Janaki Ram ◽  
B. E. Stucker
Keyword(s):  
Feasibility Study ◽  
Titanium Substrate ◽  
Current Work ◽  
Orthopedic Implant ◽  
Alternative Strategies ◽  
Laser Engineered Net Shaping ◽  
Advantages And Disadvantages ◽  
Material Systems ◽  
Net Shaping ◽  
Cobalt Base

Titanium- and cobalt-base alloys are the most widely used orthopedic implant materials. As there are specific advantages and disadvantages with both of them, one approach to fabricate superior implants is to combine these two material systems. The current work examines the feasibility of depositing CoCrMo coatings on Ti substrates using Laser Engineered Net Shaping®. Studies show that deposition of CoCrMo coating on a Ti substrate is very challenging, cracking and delamination being the major observations. Several alternative strategies, which may lead to satisfactory coatings, are presented.

RP Technology Used for the Production of Metal Parts

2015 ◽  
Vol 818 ◽  
pp. 280-283
Author(s):  
Veronika Čapková ◽  
Ivana Zetková
Keyword(s):  
Rapid Prototyping ◽  
Modern Technology ◽  
Layer By Layer ◽  
Direct Metal Laser Sintering ◽  
Metal Parts ◽  
Laser Engineered Net Shaping ◽  
Advantages And Disadvantages ◽  
Metal Products ◽  
Net Shaping ◽  
Bottom To Top

Rapid prototyping (RP) is a modern technology which can produce components with very complicated shapes using different materials. This method also allows the production of components with shapes and geometry that would be very difficult to produce using conventional methods such as milling, welding and so on. A 3D printer builds an object from bottom to top, layer by layer. The purpose of this article is to introduce rapid prototyping technology for printing metal products. It focuses on various areas of application, advantages and disadvantages of this manufacturing technology as well as introduction of two methods DMLS (Direct Metal Laser Sintering) and LENS (Laser Engineered Net Shaping).

Laser Engineered Net Shaping of Titanium-Silver Alloy for Orthopedic Implant

2018 ◽  
Author(s):  
Yingbin Hu ◽  
Shahrima Maharubin ◽  
Weilong Cong ◽  
George Tan
Keyword(s):  
Medical Instrument ◽  
Bacterial Attachment ◽  
Orthopedic Implant ◽  
Silver Alloy ◽  
Laser Engineered Net Shaping ◽  
Post Surgery ◽  
3D Microscopy ◽  
Human Fibroblast Cells ◽  
3D Printed ◽  
Net Shaping

Post-surgery infection is one of the major causes of orthopedic implantation failure. Silver has been widely used as a broad-spectrum antimicrobial component in medical instrument. This paper presents a pioneering study on laser engineered net shaping (LENS) of titanium-silver (Ti-Ag) alloy for implant-related infection control. Ti-Ag alloy coupons were 3D printed through LENS process and characterized by 3D microscopy. The biofilm resistance and biocompatibility of the alloy samples were investigated. Results showed that the alloy significantly reduced the bacterial attachment for both Gram-positive and Gram-negative strains, and has no cytotoxicity to human fibroblast cells. This study demonstrated a great potential of laser 3D printed Ti-Ag alloy for orthopedic implant.

scholarly journals Ultrasonic Vibration-Assisted Laser Engineered Net Shaping of Inconel 718 Parts: A Feasibility Study

2017 ◽  
Vol 10 ◽  
pp. 771-778 ◽  
Author(s):  
Fuda Ning ◽  
Yingbin Hu ◽  
Zhichao Liu ◽  
Weilong Cong ◽  
Yuzhou Li ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Ultrasonic Vibration ◽  
Inconel 718 ◽  
Laser Engineered Net Shaping ◽  
Net Shaping

ESTUDO DA VIABILIADE DA MANUFATURA ADITIVA DIRETA DE MULITA POR LASER ENGINEERED NET SHAPING (LENS)

2021 ◽  
Author(s):  
Thiago Azevedo ◽  
Italo Leite de Camargo ◽  
Johan sebastian Grass Nunez ◽  
Fábio Mariani ◽  
Reginaldo Coelho ◽  
...  
Keyword(s):  
Laser Engineered Net Shaping ◽  
Net Shaping

Comparison of Hip Torque and Radial Forcing Effects on Locomotion Stability and Energetics

2013 ◽  
Author(s):  
Zhuohua Shen ◽  
Peter Larson ◽  
Justin Seipel
Keyword(s):  
Inverted Pendulum ◽  
Legged Robots ◽  
Asymptotically Stable ◽  
Alternative Strategies ◽  
Advantages And Disadvantages ◽  
Potential Alternative ◽  
Spring Loaded Inverted Pendulum

Hip torque and radial forcing along the leg are two common actuation methods for legged robots. However, hip torque and radial forcing have not been compared as potential alternative strategies of actuation. The respective advantages and disadvantages of hip torque and radial forcing are not well known. In this paper, we compare hip torque and radial forcing actuation through the simulation of two models: a Rotary-forced Spring-Loaded Inverted Pendulum and a Radially Forced Spring-Loaded Inverted Pendulum. Both actuation methods can produce fully asymptotically stable locomotion. Interestingly, it is found that they improve locomotion stability in different ways: hip torque first destabilizes locomotion when initially introduced but greatly stabilizes locomotion when it keeps increasing; radial forcing always stabilizes locomotion, but in a moderate way.

Microstructure and mechanical property of TiB reinforced Ti matrix composites fabricated by ultrasonic vibration-assisted laser engineered net shaping

2019 ◽  
Vol 25 (3) ◽  
pp. 581-591 ◽  
Author(s):  
Fuda Ning ◽  
Yingbin Hu ◽  
Weilong Cong
Keyword(s):  
Ultrasonic Vibration ◽  
Acoustic Streaming ◽  
Nonlinear Effects ◽  
Small Variation ◽  
Microstructural Characterization ◽  
Matrix Composites ◽  
Heterogeneous Distribution ◽  
Content Type ◽  
Laser Engineered Net Shaping ◽  
Net Shaping

Purpose The purpose of this paper is to identify if the implementation of ultrasonic vibration in laser engineered net shaping (LENS) process can help to reduce internal weaknesses such as porosity, coarse primary TiB whisker and heterogeneous distribution of TiB reinforcement in the LENS-fabricated TiB reinforced Ti matrix composites (TiB-TMC) parts. Design/methodology/approach An experimental investigation is performed to achieve the results for comparative studies under different fabrication conditions through quantitative data analysis. An approach of microstructural characterization and mechanical testing is conducted to obtain the output attributes. In addition, the theoretical analysis of the physics of ultrasonic vibration in the melting materials is presented to explain the influences of ultrasonic vibration on the microstructural evolution occurred in the part fabrication. Findings Because of the nonlinear effects of acoustic streaming and cavitation induced by ultrasonic vibration, porosity is significantly reduced and a relatively small variation of pore sizes is achieved. Ultrasonic vibration also causes the formation of smaller TiB whiskers that distribute along grain boundaries with a homogeneous dispersion. Additionally, a quasi-continuous network (QCN) microstructure is considerably finer than that produced by LENS process without ultrasonic vibration. The refinements of both reinforcing TiB whiskers and QCN microstructural grains further improve the microhardness of TiB-TMC parts. Originality/value The novel ultrasonic vibration-assisted (UV-A) LENS process of TiB-TMC is conducted in this work for the first time to improve the process performance and part quality.

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