化学化工材料中表面形态分析检测方案(扫描电镜)

www.coxem.com13 Overview Due to SEM’s high resolution and large depth of focus， various chemicals can be analyzed in great detail. Yttria coatings (Y2O3) on alumina (Al2O3) and titania(TiO2)， manufactured by suspension plasma spraying， havebeen employed in a wide variety of applications. For example，they are used for anti-oxidation or anti-wear applications insemiconductors， where the sample of interest must resist contactwith abrasive surfaces. Yttria is known for its low etch rate， butdue to its high cost， the demand for high-purity ceramics as asubstitute is increasing. Two micrographs below show ytrriacoatings on alumina， with low plasma power density. X500.20kVX500，20kV Silver Powder Silver is actively used in electrical applications because it isthe best thermal and electrical conductor of all the metals. Scientists are actively findingways to develop silvernanowires because small-sizedsilver particles can be used tomake better touchscreens forsmartphones. Gold Particle Accelerating voltage is an important factor in determiningresolution. For highest resolution， samples are imaged at highvoltage. However， samples may be damaged when imagedat high voltage. Image below is a gold particle imaged at lowvoltage (left) and high voltage (right). OtherImages Silver (x20，000) Silica (x20，000) Zirconium oxide (x10，000) Graphite powder (x5，000) OLVSP FO-01 Carbon nanotube (x10，000) Lithium (x10，000) Titania (x50，000) Fiber (x10，000) Copper(x10，000) Silver powder electrode (x20，000) Yttria coatings (Y2O3) on alumina (Al2O3) and titania (TiO2), manufactured by suspension plasma spraying, have been employed in a wide variety of applications. For example, they are used for anti-oxidation or anti-wear applications in semiconductors, where the sample of interest must resist contact with abrasive surfaces. Yttria is known for its low etch rate, but due to its high cost, the demand for high-purity ceramics as a substitute is increasing. Two micrographs below show ytrria coatings on alumina, with low plasma power density.