|
|
Expert in Surface Engineering, Diamond like hard coating, Cathodic arc, Metallurgy, and Medical instruments
Available for your Consulting and Expert Witness Needs
|
|
|
|
Summary of Expertise:
|
Listed with other top experts in: |
|
Most of Expert's scientific career has been devoted to the development of surface modification and thin film deposition technologies, including plasma nitriding, plasma carbonization, boriding, chromizing, cathodic arc, filtered cathodic arc, pulsed laser ablation, magnetron sputtering, pulsed mid-frequency dc magnetron sputtering, plasma enhanced chemical vapor deposition, and rf-dc plasma enhanced chemical vapor deposition. Expert has developed a combined rf and dc plasma enhanced chemical vapor deposition technology, which combines the high plasma density of the rf plasma and the high substrate bias of dc power supply, enabling the deposition of high quality diamond like carbon films and carbon nitride films. He also developed a dc plasma enhanced laser ablation technology, which uses additional dc plasma to enhance the ionization of the gases during deposition of diamond like carbon films. The expert has developed an plasma nitriding and carbilizing process for stainless steel. In addition, an duplex coating system, combining plasma nitriding and surface coatings, were developed, which can significant improve the wear resistance, abrasion resistance, surface hardness, galling resistance, fatigue, and corrosion resistance of the stainless steel. He published more than 70 papers in the peer-reviewed professional journals.
|
|
|
In the past 15 years, experts has been working on the characterization of the surface morphology, microstructure, crystalline structure, mechanical properties, including internal stress, microhardness, Young's modulus, adhesion, wear resistance, of metal bulk materials and hard coatings and thin films, including TiN, TiAlN, TiSiN, TiCrN, CrN, diamond like carbon (DLC), metal containing diamond like carbon, TiN/Ti multilayers, using atomic force microscopy (AFM), scanning electronic microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), FTIR, Raman, surface profilometer, microhardness indenter, nanoindenter, Rockwell adhesion tester, scratch adhesion tester, and Pin-on-disk tribometer.
|
|
|
Expert has been working on the development of inorganic coatings (diamond like carbon based nanocomposite coatings, Ag based coatings, and titanium oxide (TiO2) coatings) for medical devices, such as implants, stents, pacemarkers, artificial heart, to improve their hemocompatibility, biocompatibility, antibacterial, antimicrobial, and corrosion resistance.
|
|
|
One of the expert's goals is to apply the developed hard coatings in the cutting tools. Expert has extensive experience in the design and selection of base materials and the surface modification techniques and surface coatings for cutting tools, dental instruments, and surgical instruments to improve their wear resistance, corrosion resistance, and oxidization resistance. Expert has applied a surface modification technology to WC cutting tools, dental instruments, drill bits, which improve their lifetime by >2 times, >100 times, and >10 times, respectively.
|
|
|
Expert has been actively involved in the area of stainless steels, including austenitic, ferritic, martensitic, dual-phase, and precipitation hardening (PH) stainless steels. Expert has assisted many customers with steel selection, heat treatment, and failure analysis of various stainless steels. Some recent work involved heat treatment of 440-XH, 440-C, 420, 17-4, 13-8, and the selection of stainless steel for dental and surgical instruments, including dental scalers and drill bits, and corrosion resistance of 440-XH, 440-C, and 316L.
|
|
|
Expert has extensive experience and knowledge in the selection, deposition process optimizing, and characterization of thin films and coatings. The range of thin films include, diamond like carbon (DLC), doped diamond like carbon, carbon nitride, TiN, ZrN, TiAlN, TiSiN, CrN, TiCN, Ag, Cu, WC, MgO, TiO2, and ZrO2. He has designed and developed coatings for meeting specific demands such as wear, corrosion resistance, and biocompatibility, antimicrobial, antibacterial, and hemocompatibility.
|
|
|
Expert has direct industry experience in the surface preparation and cleaning for thin films and coatings deposition to prevent the delamination of the coatings from the substrates. Expert has developed a surface cleaning process for the deposition of TiN based hard coatings on dental instruments, which reduced the production reject rate from >30% to <5%.
|
|
|
Expert has direct experience in the corrosion testing, corrosion protection by surface coatings, and providing advice on the proper choice of materials and surface coatings. Export has strong background and experience in the corrosion (alkaline corrosion, chlorine corrosion, and autoclave corrosion, biological corrosion) prevention of steels, especially stainless steels, by applying chemical inert coatings, such as diamond like carbon coatings, TiN, TiSiN, and TiO2, and sacrificial coatings, such as Al, Zn, AlNi, and AlZn coatings.
|
|
|
Expert has direct experience with the heat treatment and superelastic behavior of TiNi shape memory alloy.
|
|
|
Expert has had many years of experience in the metallurgical engineering. He was an associate professor in the Department of Metal Materials and Heat Treatment. He taught courses of “Physical Metallurgy” and “Phase Transformation in Solid State” for graduate and undergraduate students in a top 10 university in China. He developed a new alloy steel for plastic die and mould, which are commercial available in China. He has extensive knowledge of the different heat treating procedures, including annealing, austenitizing, quenching, tempering, solution treating, precipitation hardening, and surface alloying, from a particular steel of alloy. Expert has recommended the optimum heat treating procedures for obtaining the properties required for particular applications. Expert has involved in the corrosion and breakage failure analysis of dental instruments (scalers and ultrasonic dental instruments) to determine source modes and causes, and to provide solutions for the failure of dental instruments.
|
|
Show Secondary and Basic Areas of Expertise | Localities:
Expert may consult nationally and internationally, and is also local to the following cities: Missoula, Montana.
|
| Year |
|
Degree |
|
Subject |
|
Institution |
|
|
1997
|
|
PhD
|
|
Materials Science and engineering
|
|
Huazhong University of Science and Technology
|
|
|
1994
|
|
Master
|
|
Materials Science and engineering
|
|
University of Science and Technology
|
|
|
1991
|
|
BS
|
|
Metal Material and Heat Treatment
|
|
University of Science and Technology
|
|
| Years |
|
Employer |
|
Department |
|
Title |
|
Responsibilities |
|
2006 to
|
|
(Undisclosed)
|
|
|
|
Matyerials Scientist
|
|
He is in charge of the surface engineering technology of the entire company. His work is mainly focused on the (1) selection of substrate materials; (2) development of surface modification techniques (plasma nitriding, filtered cathode vacuum arc deposition, and plasma enhanced chemical vapor deposition technology) and process; and the (2) development and characterization of surface coatings (Diamond like carbon (DLC), TiN, TiAlN, TiSiN, TiCN, and metal containing DLC coatings) for dental and surgical instruments (dental scalers, drill bits, scissors, scalpel blades), medical implants (artificial joints, screws, plates), and medical devices to improve the wear, fatigue, galling, and corrosion properties as well as their hemocompatibility, biocompatibility, and antimicrobial properties.
|
|
2005 to 2006
|
|
University of Texas at Arlington
|
|
Materials Science and Engineering
|
|
Post doctoral research associate
|
|
His did research work in the (1) deposition of carbon based nanocomposite hard coatings, such as diamond like carbon, C/Cr multilayer, and Co/C magnetic nanocomposite films by rf assisted magnetron sputtering, (2) characterization of the deposited coatings using X-ray diffraction (XRD), Scanning electronic microscopy (SEM), x-ray photoelectronic spectroscopy (XPS), Raman, transmission electronic microscopy (TEM), and optical microscopy, as well as the (3) surface cleaning and modification of 4340 steel by electrolytic plasma processing (EPP) technique.
|
|
2003 to 2005
|
|
Carnegie Mellon University
|
|
Physics
|
|
Post doctoral research associate
|
|
He did research work in the synthesis of Fe, Fe3O4, Fe/Pt core/shell nanoparticles with a size of 3-10 nm by high temperature chemical methods, and the characterization of the Fe and Co nanoparticles and arrays by transmission electron microscopy (TEM).
|
|
2001 to 2003
|
|
Chemnitz University of Technology, Germany
|
|
Physics
|
|
Research Scientist
|
|
His work was mainly focused on the (1) development and optimization of deposition process of oxide coatings (MgO, and TiO2) using a novel pulsed DC mid-frequency magnetron sputtering, (2) plasma diagnostic, and (3) characterization of the surface morphology, microstructure, crystalline structure, internal stress, hardness, optical properties, and the secondary electron emission properties of the deposited MgO coatings using SEM, XRD, TEM, and ellipsometers.
|
|
1999 to 2001
|
|
Nanyang Technological University, Singapore
|
|
Electric and Electronic Engineering
|
|
Research Fellow
|
|
His work was mainly focused on the (1) development and optimization of deposition process for hard coatings, including Cu, TiN, TaN, ZrN, and (Ti,Al)N coatings and diamond like carbon based nanocomposite films, i.e. tetrahedral amorphous carbon (ta-C films), carbon nitride films, and metal (W, Fe, Ni, Mo, Cu, V, Al, and Ti) containing tetrahedral carbon films (ta-C: Me), by off-plane double-bend filtered cathodic vacuum arc (FCVA) technique; (2) characterization of the hardness, Young's modulus, internal stress, wear resistance, surface energy, surface morphology, crystalline structure, composition, and bonding structures of the deposited coatings using nanoindenter, microhardness indenter, substrate curvature method, pin-on-disc, micro-drop method, atomic force microscopy (AFM), SEM, XRD, XPS, Raman, and FTIR, respectively.
|
|
1997 to 2001
|
|
Huazhong University of Science and Technology, P.R. China
|
|
Materials Science and Engineering
|
|
Associate professor, vice director
|
|
He was an associate professor and a vice director of the Materials Science and Engineering department. He also taught cause of “Solid State Phase Transformation” for graduate students, and did research work in the (1) development of a plasma assisted pulsed laser ablation technique for the deposition of novel diamond like carbon based coatings and carbon nitride coatings; (2) optimization of the deposition processes and characterization of diamond like carbon films deposited by radio frequency PECVD, pulsed laser ablation, and cathodic arc; (3) characterization of the biocompatibility of carbon based coatings; and the (4) application of the (Ti, Al)N coatings for hot work Die and Mould. He also worked on the development of a new Pins Steel of Plastic Dies (65MnV) and a Cold Work Tool steel.
|
Associations/Societies
Member of the AVS Science and Technology Society, MRS, and ASM.
|
Professional Appointments
Editorial Board Member of The Open Materials Science Journal and The Open Biomaterials Journal, 2007-present.
Technical reviewer for 11 peer-reviewed international journals: “Journal of Applied Physics”, “Diamond and Related Materials”, “Surface and Coating Technology”, “J. Crystal Growth”, “Journal: Physics B”, “Materials Science and Engineering A”, “Materials Science and Engineering B”, “Optical communication”, “Electrochemical and Solid-State Letters”, “Physica E”, and “Vacuum”.
? Technical reviewer of the International Conference on Metallurgical Coatings and Thin Films 2003, San Diego, USA.
|
Awards/Recognition
Awarded the Japan Society for the Promotion of Science (JSPS) fellowship of Japan government in 2001.
Biography was cited in the Chronicle of Human Achievement Who's Who in Science and Engineering (7th Edition 2003-2004 and 2006-2007)
|
| Publications: |
 |
Publications and Patents Summary
He has published over 70 papers in the peer-reviewed international journals in the field of thin films, coatings, material science, and vacuum science and technology.
|
|
Selected Publications and Publishers
|
|
|
- The Journal of Vacuum Science and Technology A
|
|
|
- Journal of Applied Physics
|
|
|
- Surface and Coatings Technology
|
|
|
- Applied Physics A
|
|
|
- International Journal of Modern Physics B
|
|
| Government Experience: |
|
| Years |
|
Agency |
|
Role |
|
Description |
|
2008 to
|
|
TATRC, U.S. Army Medical Research & Materiel Command
|
|
Materials Scientist
|
|
He is in charge of the TATRC projects to develop an advanced surface engineering technology, process, and coating materials for surgical tools, implants, and medical devices to improve their wear resistance, corrosion resistance, biocompatibility, hemocompatibility, and antibacterial properties.
|
|
2006 to 2008
|
|
Army Research Laboratories
|
|
Materials Scientist
|
|
He was doing research work in the development and characterization of wear, corrosion, and erosion resistant coatings for parts and components used in army and air force.
|
| Selected Consulting Examples: |
-
He recommended a deposition process for TiAlN coatings using cathodic arc deposition technology to improve the service life of hot work dies.
-
He has recommended the optimum heat treating procedures for steels and alloys for obtaining the properties required for particular applications.
-
He has recommended the base material, and surface modification and coating deposition techniques and processes for cutting tools and cutting dental and surgical instruments to improve their wear and corrosion resistance.
|
|
Recent Client Requests:
|
-
Expert in polyurethane processing for consulting on covering rolls and other shapes to provide an extremely tough long wearing surface.
-
Expert for consulting on Metals needed.
-
Expert in on the development of a cutting tool and evaluation method.
-
Expert in Ti Plating.
|
|
Click the green button above to contact
Expert for a free initial screening call regarding your expert consulting needs.
Expert is available for consulting to corporate, legal and government clients.
Remember, your initial screening call to speak with
Expert is free.
|
|
Click the green button above to contact
Expert for a free initial screening call regarding expert testimony,
litigation consulting and support, forensic services, or any related expert witness services.
A few litigation needs include product liability, personal injury, economic loss, intellectual property
(patent, trademark, trade secret, copyright), and insurance matters. Remember, your initial screening
call to speak with
Expert is free.
|
| International Experience: |
|
| Years |
|
Country / Region |
|
Summary |
|
1997 to 1999
|
|
P.R. China
|
|
He was an associate professor and a vice director of the Materials Science and Engineering department. He also taught cause of “Solid State Phase Transformation” for graduate students, and did research work in the (1) development of a plasma assisted pulsed laser ablation technique for the deposition of novel diamond like carbon based coatings and carbon nitride coatings; (2) optimization of the deposition processes and characterization of diamond like carbon films deposited by radio frequency PECVD, pulsed laser ablation, and cathodic arc; (3) characterization of the biocompatibility of carbon based coatings; and the (4) application of the (Ti, Al)N coatings for hot work Die and Mould. He also worked on the development of a new Pins Steel of Plastic Dies (65MnV) and a Cold Work Tool steel.
|
|
1999 to 2001
|
|
Singapore
|
|
His work was mainly focused on the (1) development and optimization of deposition process for hard coatings, including Cu, TiN, TaN, ZrN, and (Ti,Al)N coatings and diamond like carbon based nanocomposite films, i.e. tetrahedral amorphous carbon (ta-C films), carbon nitride films, and metal (W, Fe, Ni, Mo, Cu, V, Al, and Ti) containing tetrahedral carbon films (ta-C: Me), by off-plane double-bend filtered cathodic vacuum arc (FCVA) technique; (2) characterization of the hardness, Young's modulus, internal stress, wear resistance, surface energy, surface morphology, crystalline structure, composition, and bonding structures of the deposited coatings using nanoindenter, microhardness indenter, substrate curvature method, pin-on-disc, micro-drop method, atomic force microscopy (AFM), SEM, XRD, XPS, Raman, and FTIR, respectively.
|
|
2001 to 2003
|
|
Germany
|
|
His work was mainly focused on the (1) development and optimization of deposition process of oxide coatings (MgO, and TiO2) using a novel pulsed DC mid-frequency magnetron sputtering, (2) plasma diagnostic, and (3) characterization of the surface morphology, microstructure, crystalline structure, internal stress, hardness, optical properties, and the secondary electron emission properties of the deposited MgO coatings using SEM, XRD, TEM, and ellipsometers.
|
| Language Skills: |
|
| Additional Skills and Services: |
|
Training/Seminars
Taught courses of "Phase transformation in solid state", "Physical Metallurgy", and "Surface Engineering" for graduate students in the Department of Materials Science and Engineering, Huazhong University of Science and Technology, P.R. China.
|
|
Supplier and Vendor Location and Selection Expert has experience locating vendors in the following areas: Metallurgical sample preparation and testing service, microhardness testers and testing services, thin film service companies, vacuum components, vacuum pumps, and different targets (Ti, TiSi, Al, TiAl, and Cr targets) used for physical vapor deposition of thin films and coatings.
|
Other Skills and Services
Vice director, Institute of Material Science and Engineering, Huazhong University of Science and Technology, June 1998 – Sep. 1999.
Supervisor of two master students and four undergraduate students in the Department of Material Science and Engineering, Huazhong university of Science and Technology, P.R. China.
|
|
Education
