The role of the glass phase is to: ① adhere the crystal phases, fill the gaps between the crystal phases and increase the density of the material; ② reduce the sintering temperature and speed up the sintering speed; ③ prevent the crystal transformation and inhibit its growth; ④ obtain light transmission and other glass characteristics; ⑤ Cannot be the dominant phase of ceramics. The gas phase is a hole left in the ceramic, and its cause is complex and there are many influencing factors.
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