【摘要】 采用石英粉（99%）、白刚玉、分析纯的硼酸、磷酸二氢氨、碳酸锂、氧化锌为原料,用TiO₂和ZrO₂为复合晶核剂,Li₂O的质量分数分别为5%、7%、9%、11%,原料混合均匀后高温熔炼成玻璃,水淬后球磨成玻璃粉,压制成型后通过烧结制备用于cBN砂轮的微晶玻璃结合剂。通过差热、XRD、SEM分析,结果表明不同含量的Li₂O在相应的热处理后均能够微晶化,能够生成大量晶粒细小而且分布均匀的锂辉石晶体。Li₂O含量为7%时微晶玻璃结合剂的强度最大,可以用于cBN砂轮制备时作为结合剂。更多还原

【Abstract】 A mixture of quartz（99%）,Al₂O₃,Li₂CO₃,ZnO,H₃BO₃,NH₄H₂PO₄（raw materials）and TiO₂,ZrO₂（compound nucleating agent）with separately 5%,7%,9%and11% Li₂O has been melted at high temperature into glass and then ball-milled into glass powder after water quenching.After compression moulding and sintering,the powders are used as microcrystalline glass bond for cBN grinding wheel.Differential thermal analysis,X-Ray diffraction and SEM analysis indicate that the powder with different content of Li₂O can generate large amount of fine and evenly distributed triphane crystals after corresponding heat treatment.The microcrystalline glass bond has the maximum strength when the Li₂O content is 7% which can be adopted as bond for cBN grinding wheel preparation.更多还原