This work aims to reveal the effects of 3D roughness parameters sandblasted surfaces on bond strength between thermal spray coatings and substrates. The investigation was carried out surface AISI 4140, which were pretreated with automatic-sandblasting system. topography analyzed by a optical profiler. WC-12Co measured using pull-off test method. Scanning electron microscope revealed that morpho...

This paper reports on an experimental and analytical investigation conducted into efficacy of the scraping shear-test method in estimating the shearing adhesive strength of a thermally sprayed coating. It was found that the critical average shear stress, the apparent failure strength of WC-Co thermal spray coating, depends on both the dimensions of the test piece and the loading position around...

In this study, CaF2 was introduced into WC-Co to prepare bulk self-lubricating cemented carbides by sinter-HIP. The studied compositions were WC-12Co with no more than 20 vol% additions. effects of on the tribological behaviors and mechanical properties investigated. It found that prepared nearly fully dense would refine WC grains. Although could not obviously enhance carbides, it improved thei...

Inconel and micro nano WC-12Co powders were deposited on AISI 4140 carbon steel by high-velocity oxy fuel (HVOF) coating followed laser surface modification. Laser power scan speed varied at different levels. Microstructure microhardness investigated. Nanocoatings performed better than microcoatings. Nanostructured WC powder coatings exhibited greater hardness compared to microstructured coatin...

HVOF coatings generally have a high bonding strength and good compactness, which improve the wear, corrosion, high-temperature oxidation, fatigue properties of substrate. They are widely used in automobile, home appliance, petrochemical, aerospace, other fields. The flame flow characteristics particle in-flight behaviors during spray process an essential influence on coating microstructure and,...

ABSTRACT We report the results of our pilot millimeter observations periodic maser sources. Using SMA, we carried out 1.3-mm G22.357+0.066 and G25.411+0.105, while ALMA archival data were used in case G9.62+0.19E. Two continuum cores (MM1 MM2) detected G22.357+0.066, three – MM3) G25.411 + 0.105. Assuming dust-to-gas ratio 100, derived masses cores. 12CO (2–1) 13CO line emission, observed gas k...

The corrugated horn is a high performance feed often used in radio telescopes. There has been growing demand for wideband optics and horns millimeter submillimeter-wave receivers. It improves the observation efficiency allows us to observe important emission lines such as CO multiple excited states simultaneously. However, millimeter/submillimeter band, it challenging create conical with fracti...

We present new results of a 12CO(J=1-0) imaging survey using the Atacama Compact Array (ACA) for 31 HI detected galaxies in IC 1459 and NGC 4636 groups. This is first CO loose galaxy obtained well-resolved data (~0.7-1.5 kpc) total 16 two environments. By comparing our ACA with UV data, we probe impacts group environment on cold gas components (CO gas) star formation activity. find that and/or ...