선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
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선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- The invest ment cylinder was immediately removed from the furnace and allowed to cool to room temperature on an elevated grid after the program was auto matically completed. After divesting and sprue cut ting, the final preparation of all specimens(n=20) were done with careful grinding to ensure the required fine surface and uniform thickness using a metallurical grinding machine (Knuth- Rotor, Stuers) with SiC disks (grit size 320 to 1200). For group 2, the specimens(n=20) were made with ceramic sprue buttons that were rem nants of the heat-pressing for group 1 by the same procedure.
- 2. Although there were no tests including color stability, casting accuracy, etc., the result of this study implied that we could reuse the sprue button of the pressed lithium disilicate glass ceramic of IPS Empress 2 system.
- For observation of the microstructure using a scanning electron microscope (LEO 145VP, LEOZ England), the polished surface was etched with the watery mixture containing 30% H2SO4 and 4% HF for 10 〜 15 seconds and immediat이y cleaned with water and ethanol, and coated by gold sputtering.
- Ceramic sprue but ton which is necessarily remained after the heat pressing procedure can be reused like a noble met al sprue button in economic reason. The pur pose of this study was to estimate biaxial flexure strength and fracture toughness of lithium disilicate glass-ceramic pressed with as-received ingots and their sprue buttons.
대상 데이터
- The lithium disilicate glass-ceramic ingots (IPS Empress 2 ingot, shade no. 500z Ivoclar) were used for this investigation. The disk specimens were divided into two groups: group 1 is ingot- pressed group; group 2 is sprue button-pressed group.
데이터처리
- The E/H ratio was determined from three Knoop indentations on each specimen. Biaxial flexure strength and KIC data were analyzed by unpaired t-test.
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