日用陶瓷增韧的研究

Study of Toughened Porcelain

本文在三成份瓷的基础上,研究了氧化铝取代石英,添加二氧化钛等对瓷胎力学性能的影响。采用XRD、SEM、EDS等手段,研究了瓷胎的显微结构,及其与力学性能的关系。结果表明: [1]氧化铝取代石英,坯体在1300℃～1500℃下烧成,其瓷胎强度与韧性的提高是由于α-氧化铝的弥散作用,以及随着氧化铝的引入,瓷胎中石英相的明显下降,因而消除了石英与石英周围裂纹的断裂源,达到增强、增韧的目的。[2]氧化铝全部取代石英,坯体在1400℃下烧成,其强度与断裂韧性最大,分别是125MPa和2.28MPam^(1/2)。【3]二氧化钛的加人能降低坯体的烧结温度.添加SWm二氧化钛于氧化铝全部取代石英的坯体中,强度明显提高达155Mk.断裂韧性由2.28MP8 h’/‘提高到2.9旱MP。m‘/‘,认为是二氧化钛的加人提高了资胎中莫来石的含量,其针状莫来石起着纤维增韧作用.

The effects of quartz replaed by alumina and titania addition to the mechanical properties (in-cluding three point bending strength and fracture toughness) of porcelain bodies have been investi-gated on the basis of tri-component porcelain. The mechanical properties were also correlated withmicrostructure analyzised by means of XRD, SEM and EDS. The results indicated that (Ⅰ) because ofthe dispersion strengthing and decrease of microcrack, the mechanical properties of bodies sinteredat 1300～1500℃ increase after quartz replaced by alumina. (2) the strength and the fracturetoughness of the bodies sintered at 1400℃ after quartz all replaced by alumina reach maximum to125MPa and 2.28MPa m^(1/2) respectively. (3) addition of titania can cause decrease of sintering tem-perature. The strength increases remarka big to 155MPa and the fracture toughness increases from2.28MPa m^(1/2) to 2.94MPa m^(1/2) after addition 5wt% titania to the bodies which quatrtz all re-placed by alumina. It is suggested that the increase of strength and toughness were mainly comlatedwith the increase of mullite content and fiber-reinforcing the of acicular mullite formed in the bod-ies.