钇稳定立方氧化锆(YSZ)晶体是重要的人工宝石材料,具有折射率高、色散强、硬度高、理化性能稳定等优点.由于YSZ熔点高达2 715 ℃,通常采用冷坩埚法生长.单炉产量是其技术先进性的主要指标,也是降低生产成本的主要途径.为了提高产率,研制出超大功率冷坩埚生长炉,其功率达到160 kW,直径达到1.5 m,成功生长出单炉5 t YSZ宝石晶体,这是迄今为止国内外报道的最高单炉产率.
Mass production of 5 tons yttria-stabilized zirconia crystals by skull melting method
Yttria-stabilized zirconia(YSZ)crystals are the most common synthetic gemstone with advantages of high refractivity,strong dispersion,high hardness,and stable physical and chemical properties.Due to their ultrahigh melting point of 2 715 ℃,YSZ crystals were grown by the skull melting method without crucible.The yield of a single furnace is the primary indicator of its technological advancement and a major pathway for reducing production costs.To enhance productivity,the skull melting furnace with high power of 160 kW and larger diameter of 1.5 m was developed and mass production of 5 t YSZ crystals was realized,which is the largest yield of YSZ crystals in a single batch.
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