Abstract: The evaluation of the interfacial adhesion of coating system has always been a rough task.
In this paper, a special testing method of cross-sectional indentation is applied on a model coating
system, i.e. electroplated chromium on a steel substrate which is generally regarded as an example
of materials pair with strong adhesion. Based on fractography analysis with SEM and interfacial
stress simulation with FEM, it is found that interfacial shear stress may induce coating spalling.
More interestingly, spalling location is sensitive to substrate pretreatment process. This shows the
feasibility of cross-sectional indentation to distinguish interfacial strength at a high level.
Abstract: Laser shock processing is an important surface treatment that induces compressive residual
stress to components, where the coating plays an important role. This paper deduce a general formula
of the optimum thickness of coating according to the law of energy conservation and analysis the
influence of coating on residual stress of the titanium alloy in laser shock processing. Titanium alloy
with black paint, silica acid black paint and without coating were shocked by laser system respectively.
It was found that coating could increase shock pressure amplitude and laser density absorption.
Compressive residual stresses at the surface of the sample with the black paint and silica acid black
paint are about -212.2MPa and -264.2MPa respectively, while the surface stress on the uncoated
specimen is very high tensile stress. The bare surface due to melting and vaporization, leads to a very
rough surface. The depth of induced compressive stress could reduce stress corrosion cracking in
titanium alloy and improve fatigue lifetime.
Abstract: Films were prepared on the steel (Q235) by means of vacuum vapor deposition through
Al65Cu20Fe15 quasicrystal powders. Influence of ceria on the microstructure and properties of films
were studied. TEM, SEM and XRD were used to observe the microstructure and morphology of
films. The hardness and the modulus of the film were tested by MTS. The results showed that the
films were formed through directly vapor deposited by Al65Cu20Fe15 quasicrystal. The films were
constituted of many phases such as CuAl2, AlCu3 and I (Al65Cu20Fe15) phase. The composition of
films was decided by the technology of deposition. After adding cerium, the microstructure of films
did not radically change, however the hardness and modulus of films varied with the increase of
cerium. When the cerium content was 5 wt%, the hardness of films was more than 9.0 GPa.
Furthermore, adding cerium could improve obviously the corrosion resistance of films.
Abstract: Coating blade wears seriously in paper coating process. Wear mechanism was analyzed
in this article. A new technology of surface coating process was introduced to increase the hardness
of the edge of coating blade and thus to prolong its service life. Surface coating preparing process
on blade was studied and metal-ceramic compound coating prepared successfully on the edge of
coating blade with AT13 (Al2O3+13%TiO2) wear resistant material by plasma spraying process.
NiCrAl alloy powder was used as under coat material. Microstructure of the coating is dense. The
coating bonds well with the matrix and have high hardness. Results of grain-abrasion testing show
that wear-resisting property of the metal/ceramic compound coating is about 7-8 times as that of
Abstract: Abrasion mechanism of thermocouple cannula is studied in this article. For different
working position and condition, different material should be selected to ensure the working
characteristics of thermocouple cannula. Several protection methods were introduced to prolong the
sevice life of thermocouple cannula. 1. M-Al series intermetallic compound coating protection
method. 2. Metal/ceramic compound coating protection method. 3. Development of new
abrasion-resisting material for high temperature according to some special work conditions of
thermocouple cannula. With the adoption of those new technologies, thermocouple cannula’s
service life can be prolonged to 3~5 times of that untreated.
Abstract: The plasma nitriding behaviors of nanocrystalline surface induced by surface mechanical
attrition (SMA) and of conventional coarse-grained surface in 1Cr18Ni9Ti stainless steel were
compared. Microstructure features of various sections in the surface layer, from the matrix to the
nitriding surface, were systematically characterized by XRD, SEM and TEM. The thickness of
compound layer and hardness distribution in the treated surface layer were investigated by means of
metallographic observation and microhardness measurement. The subsequent nitriding kinetics of
the treated steel with the nanostructured surface layer were greatly enhanced, the nitriding thickness
was deeper than that of the conventional surface and the nitriding temperature could be as low as
300°C, which is much lower than conventional nitriding temperature.
Abstract: Based on the nonlinear theory of von Karman plate, axisymmetric nonlinear vibration of a
functionally graded circular plate with clamped boundary condition is investigated under thermal
loading. It is assumed that the mechanical and thermal properties of functionally graded materials
vary continuously through the thickness of the plate and obey a simple power law related to the
volume fraction of the constituents. Motion equations for the problem are derived. Existence of
harmonic vibrations is assumed and then Ritz-Kantorovich method is used to convert the dynamic
Von Karman equations to a set of nonlinear ordinary differential equations. Finally a shooting method
is employed to numerically solve the resulting differential equations. Effects of amplitude A, thermal
load parameter λ and material constant n on the vibration behavior of FGM plate are discussed in
Abstract: The tribological behaviors of Diamond-like carbon (DLC) films, prepared by the radio
frequency plasma enhanced chemical vapor deposition (RF-PECVD) method, were studied in the
room temperature and the elevated temperature. The ball-on-disk tests with DLC films on steel
specimens were conducted at a sliding speed of 60 rpm, a load of 10 N, and surrounding temperatures
of 25°C and 75°C. The results show that the coefficients of friction and the amounts of wear of DLC
films were decreased at higher temperature. After tests the wear tracks of hydrogenated DLC film
were analyzed by Raman spectroscopy.
Abstract: Due to the environmental concerns, especially the greenhouse effect and GWP (Global
Warming Potential), the carbon dioxide was investigated as an alternative natural refrigerant to
replace HFCs (HydroFluoroCarbons) in refrigerator or air conditioning systems. To develop new
compressor, especially rotary type, the friction and wear characteristics of sliding surfaces between
vane and flange in the rotary compressor were evaluated in this paper. Several hard coatings, such
as TiN, CrN and WC/C, were applied on vane surfaces in order to improve the tribological
characteristics, and their performances were evaluated experimentally. The vane-on-flange type
lubricated sliding tests were performed with a high pressure wear tester using HFC (R410A) and
carbon dioxide. From the tests, wear volumes of vane surfaces applied with various coatings were
compared each other.