• Journal of the Korean Crystal Growth and Crystal Technology
• /
• v.17 no.3
• /
• pp.102-107
• /
• 2007

Dielectric layer of phosphate glass for plasma display panel (PDP) device made by silk screen printing on soda-lime glass. For regulate thermal expansion coefficient (CTE) of between substrate glass and dielectric layer use addition of $Al_2O_3$ and $TiO_2$. The crystallization process of glass-ceramics for dielectric layer have been examined by DTA, XRD some of optical, electrical properties of the dielectric layer were evaluated by UV-spectrometer, dilatometer, impedance analyser. The principal crystalline phase was identified as zinc metaphosphate [$Zn(PO_3)_2$] and zinc pyrophosphate [$Zn_2P_2O_7$]. Reflectance and dielectric constance increased with the addition of $TiO_2$ filler, dielectric constant lower the out side reflectance unchanging of the adding of $Al_2O_3$ filler. Besides CTE was at about $62{\times}10^{-7}/^{\circ}C$.

• Journal of the Korean Ceramic Society
• /
• v.28 no.9
• /
• pp.683-688
• /
• 1991

ZnO-P2O5 system glass containing 45 to 60 mol% ZnO has been melted at 120$0^{\circ}C$ and crystallized through heat treatment. Each condition of crystallization was determined by measurement of dilatometric softening point and DTA. The principal crystalline phase was identified as zinc metaphosphate [Zn(PO3)2] in the glasses containing 45~55 mol% ZnO and zinc pyrophosphate (Zn2P2O7) in the sample of 60 mol% ZnO with X-ray diffraction patterns. The crystalline mechanism was investigated by XRD and SEM. As the results, the specimens containing 50~60% ZnO showed the existence of oriented structure due to one-dimensional crystal growth.

• Journal of the Korean Crystal Growth and Crystal Technology
• /
• v.1 no.2
• /
• pp.94-103
• /
• 1991

ZnO-$P_2O_5$ system glasses containing 45 to 60 mol% ZnO have been melted at$1200^{\circ}C$and crystallized through controlled heat treatment. The properties of the base glass and crystallized glass were examined with XRD. FTIR. density. thermal expansion, electric conductivity, hardness. The principal crystalline phase was identified as zinc metaphosphate [$Zn(PO_3)_2$ in crystallized glasses containing 45-55mol% ZnO and zinc pyrophosphate ($Zn_2P_2O_7$) in the sample of 60mol% ZnO with X - ray diffraction analysis. Thermal expansion coefficient and DC electrical conductivity were varied with direction of oriented crystalline in the samples containing 50-60mol% ZnO. This suggests the existance of the oriented crystalline.

• Journal of the Korean institute of surface engineering
• /
• v.44 no.6
• /
• pp.239-245
• /
• 2011

Magnesium alloys is the lightest by structural metals, but it is not good corrosion resistant because of pit, void. Particularly, AZ31B magnesium alloy sheets that have slag, scratch by rolling process indicate some defects. The objective of this research is to perform uniform plating on AZ31B by studying etching and zincate process. Especially, zincate treatment by zinc salt and pyrophosphate is the most important in the decoration plating. Dissolution of magnesium is reduced by the formation of uniform zinc conversion layer during strick and post process, which decreases defects for plating process.

• Journal of the Korean Wood Science and Technology
• /
• v.37 no.2
• /
• pp.155-163
• /
• 2009

This study examined the thermal stability of PLA-WF bio-composites. Wood flour (WF)-filled PLA bio-composites were reinforced with the flame retardants, Melamine pyrophosphate (MPP), resorcinol bis (diphenyl phosphate) (RDP) and zinc borate (ZB). The flame retardant was compounded with PLA and natural biodegradable filler. The thermal properties of the biodegradable polymer and bio-composites reinforced with the flame retardant were measured and analyzed by DSC, DMA and TGA. The results showed that the flame retardant-reinforced biodegradable bio-composite exhibited improved thermal properties.