Search Result of "Winotai, A."

About 6 results
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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : LA-ICP-MS Study of Impurity Ion Concentrations in Zircon)

ผู้เขียน:ImgAraya Mungchamnankit, ImgSupanee Limsuwan, ImgPongtip Winotai, ImgSiwaporn Meejoo

สื่อสิ่งพิมพ์:pdf

Abstract

Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) is surfacesensitive analytical technique for the estimation of element concentrations as well as their spatial distribution in the analyzed sample. In this work, LA-ICP-MS technique was used for analyzing the impurity ion concentrations in zircon. Because the presence of the impurity ions in the zircon usually caused the color in crystal, the zircon samples in this study are divided into three major groups i.e. untreated zircon (brown color), heat treated zircon in oxygen atmosphere (yellow color) and heat treated zircon in argon atmosphere (greenish blue color). For the first group, the most impurity ion concentrations are Fe (208.90 ppm) and Ti (91.24 ppm). For the second and third groups, there are Fe (965.88 ppm) and Mg (412.20 ppm), Fe (434.66 ppm) and Ti (109.26 ppm), respectively.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 041, Issue 5, Jan 07 - Dec 07, Page 267 - 271 |  PDF |  Page 

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Properties of Titanium Nitride Film Coated on Stainless Steel 304)

ผู้เขียน:ImgNitinai Udomkan, ImgVilasinee Sutorn, Imgพิเชษฐ ลิ้มสุวรรณ, ImgPongtip Winotai

สื่อสิ่งพิมพ์:pdf

Abstract

The characteristics of titanium nitride (TiN) film coated on the stainless steel substrates were studied under various processing conditions, e.g., different nitrogen flow rates and substrate temperatures. The TiN film was produced by reactive magnetron sputtering process under mixed gases pressure of argon and nitrogen with the stainless steel 304 substrates. X-ray diffraction was used to verify the TiN crystalline structure. The diffraction patterns of Ti2N(101)and TiN (111)phase at 2? =34.50? and 36.10?, respectively,were found when the nitrogen flow rate was 3.338 sccm.The nitrogen flow rates of 3.84 and 7.80 sccm only the TiN (111) peak was observed at 2? = 36.10?. Scanning electron microscopy examination indicated that the film structure was more uniform and denser for higher substrate temperature. At 250?C, the film structure was nonuniform, there were some grooves and a big hump on titanium nitride film. Hardness measurements were performed by Nano Inderter to determine the mechanical properties of the films. A color of film was measured by spectrophotometer. TiN films have a uniform golden color. The result showed that the surface hardness of stainless steel which was coated with this film was higher. The film hardness at 50 nanometer depth was higher than that at 100 nanometer for films thickness of about 1 micron. The experiment result showed the highest hardness was obtained when nitrogen flow rate was 7.80 sccm and titanium nitride film was TiN-phase.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 037, Issue 2, Apr 03 - Jun 03, Page 209 - 218 |  PDF |  Page 

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Structure of Titanium Nitride Coatings on Stainless Steel 304)

ผู้เขียน:Imgพิเชษฐ ลิ้มสุวรรณ, ImgNitinai Udomkan, ImgPongtip Winotai

สื่อสิ่งพิมพ์:pdf

Abstract

The microstructure of TiN films deposited by magnetron sputtering are related to their properties and deposition conditions. The transition from porous to compact films and the change in their microhardness, lettice parameters and gas pressure and energy of ion bombardment. The extended crystallographic anisotropy of inhomogeneous lattice deformations is a new phenomenon in which thin polycrystalline films differ from bulk stress-free materials.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 037, Issue 3, Jul 03 - Sep 03, Page 385 - 388 |  PDF |  Page 

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Researcher

นาย สุรเชษฐ จามรมาน, รองศาสตราจารย์

ที่ทำงาน:ภาควิชากีฏวิทยา คณะเกษตร บางเขน

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Researcher

ดร. วิบูลย์ จงรัตนเมธีกุล, รองศาสตราจารย์

ที่ทำงาน:ภาควิชากีฏวิทยา คณะเกษตร บางเขน

สาขาที่สนใจ:การจัดการศัตรูพืชแบบบูรณาการ, นิเวศวิทยาและการจัดการศัตรูพืช (Insect Ecology and Integrated Pest Management)

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