The surface defect appeared mainly as air bubbles and ferroferric oxide drops which centred around the lower outer - field portion of the stoneware cup.
表观缺陷主要表现为釉泡和氧化铁颗粒，且其集中于杯体下部外侧面。
2
The composition of nano granulated ferroferric oxide and nano lamellar hydroxyapatite is realized, and the ferroferric oxide has uniform distribution and no agglomeration.