Study of TiN Film Adhesion Strength by Pulsed-Laser Shock Detection Method

2012 ◽  
Vol 271-272 ◽  
pp. 372-377
Author(s):  
Bin Bin Yu ◽  
Jun Tang Yuan
Keyword(s):  
Adhesion Strength ◽  
Detection Method ◽  
New Technology ◽  
Pulsed Laser ◽  
Experimental Result ◽  
Laser Shock ◽  
Tin Film ◽  
Film Substrate ◽  
Film Separation ◽  
Shock Detection

Bonding strength of the interface of film-substratum is an important factor and key problem that influence the reliability and usage of film-substratum system. The new technology of pulsed-laser shock detection method which analyzes the mechanism and mathematical model of film separation under the action of pulsed-laser shock,. With the example of measuring the adhesion strength of TiN/SKD11 film system, the surface was respectively impacted with pulsed-laser at the range of 650~1000mJ. To observe the surface topography of Impact points by scanning electron microscope, and to identify TiN film failure threshold by the reflected signal detection. By analyzing the experimental result, it was suggested that film/substrate interfacial adhesion strength was 4.954GW/cm2.

Affected Characteristics Analysis of the Pulsed Laser Forming of Metal Sheet

2008 ◽  
Vol 375-376 ◽  
pp. 333-337
Author(s):  
Li Jun Yang ◽  
Yang Wang
Keyword(s):  
Laser Beam ◽  
Pulsed Laser ◽  
Metal Sheet ◽  
Grain Structure ◽  
Experimental Result ◽  
Laser Forming ◽  
Forming Process ◽  
Grain Orientations ◽  
Characteristics Analysis ◽  
Relationship Of

Laser forming of metal sheet is a forming technology of sheet without a die that the sheet is deformed by internal thermal stress induced by partially irradiation of a laser beam. In this paper, the bending behavior of common stainless steel 1Cr18Ni9 sheet is studied after being irradiated by straight line with a Nd:YAG pulsed laser beam. The aim of the investigation is to find out the relationship of the physical behaviors of heat affected zone (HAZ) with the pulse parameters of the laser. Through the analysis of the fundamental theory of pulsed laser affected, this paper shows the affected characteristics of metal sheet with pulsed laser forming. The results show that the microstructure of HAZ of pulsed laser scanned is layered, and the micro-hardness is improved than that in matrix. The microstructures show that the deformed grain structure is inhomogeneous, that caused the grain sizes and grain orientations in HAZ to become different. By qualitative analysis of experimental result, the conclusion obtained may provide basis for theoretical investigation and possible industrial application of laser forming process in the future.

Evaluation of Adhesive Strength of Oxide Layer on Carbon Steel at Elevated Temperatures

2009 ◽  
Vol 1215 ◽  
Author(s):  
Manabu Satou
Keyword(s):  
Carbon Steel ◽  
Oxide Layer ◽  
Adhesive Strength ◽  
Elevated Temperatures ◽  
Pulsed Laser ◽  
Laser Shock ◽  
Protective Layers ◽  
Base Materials ◽  
Essential Parameter ◽  
Oxidation Layers

AbstractAdhesive strength of the oxidation layers on carbon steel was evaluated by means of a laser shock method, which uses a pulsed laser to generate shock wave. Oxidation for 200 hours in air created 10-micron-thick magnetite on carbon steel. Typical strength of the layer was evaluated to be about 50MPa at ambient temperature. The adhesive strength was varied from around one-tenth of yield stress to the ultimate tensile strength of the base materials. The adhesive strength of the oxide layer depended on test temperature. It is possible that the adhesive strength becomes an essential parameter for the evaluation of the protective layers.

Evaluation of Interfacial Fatigue Strength of Hard Coating by Using Repeated Laser Shock Adhesion Test

2019 ◽  
Author(s):  
Kohei Kanamori ◽  
Yusaku Saito ◽  
Akio Yonezu
Keyword(s):  
Laser Irradiation ◽  
Adhesion Strength ◽  
Laser Shock ◽  
Adhesion Test ◽  
Heat Treated ◽  
Interface Delamination ◽  
Out Of Plane ◽  
Plane Displacement ◽  
Strength And Durability ◽  
Pulsed Laser Irradiation

Abstract This study aims to evaluate the adhesion strength and durability of hard coatings in a non-contact manner by using Laser Shock Adhesion Test (LaSAT). Both heat-treated and as-plated (non-heat-treated) Ni-P coatings deposited on carbon steel substrate by electroless plating method were prepared as specimens for this study. LaSAT uses strong elastic waves induced by pulsed laser irradiation in order to apply tensile stress to the coating/substrate interface so that interface delamination occurs. The out-of-plane displacement is also measured simultaneously by using a laser ultrasonic interferometer, and the interface delamination is detected by the change of the out-of-plane displacement waveform. Furthermore, computation of the elastic wave propagation using Finite Difference Time Domain (FDTD) is carried out to estimate the interfacial tensile stress. In addition, the adhesion durability is investigated by repetitive pulsed laser irradiation, and the relationship between the adhesion strength and the number of laser irradiation cycles until delamination was obtained. Finally, we discussed the effects of heat treatment on the adhesion strength and durability. This method of LaSAT is a quick measurement for the adhesion durability, and then it may shed some light on quality control of surface coating.

scholarly journals Microcracks, spall and fracture in glass: A study using short pulsed laser shock waves

1998 ◽  
Vol 83 (7) ◽  
pp. 3583-3594 ◽  
Author(s):  
Xin-Zen Li ◽  
M. Nakano ◽  
Y. Yamauchi ◽  
K. Kishida ◽  
K. A. Tanaka
Keyword(s):  
Shock Waves ◽  
Pulsed Laser ◽  
Laser Shock

Indentation Load Relaxation Studies of Thin Film-Substrate Systems

1986 ◽  
Vol 72 ◽  
Author(s):  
D. Stone ◽  
W. Lafontaine ◽  
S. Ruoff ◽  
S.-P. Hannula ◽  
B. Yost ◽  
...  
Keyword(s):  
Thin Film ◽  
Aluminum Film ◽  
Indentation Load ◽  
Load Relaxation ◽  
Tin Film ◽  
Relaxation Studies ◽  
Film Substrate

AbstractResults from indentation load relaxation (ILR) tests on thin film-substrate systems are reported. In the case of a 1 pum aluminum film on silicon, the data can be interpreted as reflecting both the properties of the film and the interface between film and substrate. Data from a 37μm TiN film on 304 SS are believed to reflect the combined behavior of the film and substrate.

Substrate Latent Heat Effects in The Calculations for Pulsed Laser Irradiated Thin Films

1983 ◽  
Vol 13 ◽  
Author(s):  
J.J. Cao ◽  
K. Rose ◽  
O. Aina ◽  
W. Katz ◽  
J. Norton
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Pulsed Laser ◽  
Phase Changes ◽  
Morphological Observation ◽  
Substrate Structure ◽  
Heat Effects ◽  
Film Substrate ◽  
Scanning Electron ◽  
Pulsed Laser Irradiation

ABSTRACTWe present a numerical model for the calculation of the temperature rise caused by pulsed laser irradiation of a thin film/substrate structure. This model includes phase changes in both the thin film and the substrate. The inclusion of phase changes results in more complex thermal behavior and significantly affects melt durations. This model was applied to the AuGe/GaAs system. Morphological observation using the scanning electron microscope and SIMS profiles provides experimental verification for the numerical calculations.

The Research of Vegetables and Fruits Storage by Air Discharge on Ship

2013 ◽  
Vol 726-731 ◽  
pp. 4534-4538
Author(s):  
Zhe Hua Du
Keyword(s):  
Fruits And Vegetables ◽  
New Technology ◽  
Soluble Solids ◽  
Experimental Result ◽  
Good Effect ◽  
Discharge Treatment ◽  
Titratable Acid ◽  
Preservation Technology ◽  
Vegetables And Fruits ◽  
Air Discharge

Fresh maintenance is the main problem existing in the storage of vegetables and fruits on ship. This paper introduced a new technology for vegetables and fruits storage: air discharge. According to the experimental result, air discharge treatment had good effect on the storage. It could reduce the wastage of total soluble solids and titratable acid during the storage. And, it could also reduce percentage of threshing. Air discharge treatment on grape storage appearance had obvious good effect. Air discharge preservation technology can effectively extend the storage time of fruits and vegetables. Improper air discharge can also cause damage to plasmalemma of fruits and vegetables. Various air discharge products concentration must be in safe range. This preservation technology needed to further research for applying on ship.

Colossal Temperature Coefficient of Resistivity in Epitaxial Colossal Magnetoresistive La0.67Ca0.33MnO3 Films

2001 ◽  
Vol 666 ◽  
Author(s):  
S.I. Khartsev ◽  
A.M. Grishin
Keyword(s):  
Temperature Coefficient ◽  
Lattice Mismatch ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Processing Conditions ◽  
Colossal Magnetoresistive ◽  
Lcmo Film ◽  
Post Annealing ◽  
Temperature Coefficient Of Resistivity ◽  
Film Substrate

ABSTRACTEpitaxial La0.67Ca0.33MnO3(LCMO) films have been grown by pulsed laser deposition technique on three single crystal substrates: LaAlO3, SrTiO3, and NdGaO3 having lattice mismatch with LCMO film of + 1.26 %, - 0.9 %, and + 0.18 %. We found the transport colossal magnetoresistive (CMR) properties were improved with the reduction of a film/substrate mismatch. Processing conditions for LCMO film on NdGaO3substrate were optimized as well as post-annealing process was employed to achieve a superior temperature coefficient of resistivity TCR = 35 %K−1 and the magnetoresistance MR = 66 % at 7 kOe. To our knowledge, these are the record CMR parameters achieved so far.

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