Effect of phosphate compound on physical and mechanical properties of SiO2 ceramic
| Autor: | Penphitcha Amonpattaratkit, Surasak Kuimalee, Wantana Klysubun, Boonrat Lohwongwatana, Noppadon Nuntawong, Atipong Bootchanont, Thanachai Boonchuduang, Nutth Tuchinda, Atchara Khamkongkaeo, Thanawat Phetrattanarangsi |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Silicon dioxide Scanning electron microscope 02 engineering and technology 01 natural sciences chemistry.chemical_compound symbols.namesake Natural rubber Impurity 0103 physical sciences Materials Chemistry Ceramic Porosity 010302 applied physics Process Chemistry and Technology 021001 nanoscience & nanotechnology Surfaces Coatings and Films Electronic Optical and Magnetic Materials Compressive strength chemistry Chemical engineering visual_art Ceramics and Composites visual_art.visual_art_medium symbols 0210 nano-technology Raman spectroscopy |
| Zdroj: | Ceramics International. 45:1356-1362 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2018.07.253 |
| Popis: | This paper reports on the addition of Al(H 2 PO 4 ) 3 binder solution with different vol% ratio and its effects on the mechanical behavior of the formed silicon dioxide ceramic. The starting material, commercial phosphate-bonded investment material, was analyzed by X-ray fluorescence (XRF) spectrometry. After silicon dioxide powder was mixed with a binder, the thick liquid was poured into a rubber mold and allowed to dry at room temperature. Then, the green bodies formed were sintered at 1200 °C for 5 h in a furnace in air atmosphere. Phase and impurities of all the ceramic samples were characterized by X-ray diffraction (XRD) and Raman spectroscopy. The morphology was revealed by scanning electron microscopy (SEM). The local atomic structures of some ceramic samples were investigated by extended X-ray absorption fine structure (EXAFS) to better understand the formation of phosphate compound. Compression test was carried out on the ceramic samples at room temperature. Results showed that quartz-cristobalite transformation in the silicon dioxide structure did not significantly affect the mechanical property of the ceramic samples prepared in this work. Porosity was decreased with Al(H 2 PO 4 ) 3 diluted binder ratio. The presence of pores act as stress concentration points in SiO 2 -based ceramics in which crack could initiate under loading. We strongly believe that a sharp increase in the compressive strength is due to phosphate compound and its unique morphology. |
| Databáze: | OpenAIRE |
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