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Method for preparing potassium-sodium niobate-based piezoelectric ceramic through two-step sintering
The invention discloses a method for preparing potassium-sodium niobate-based piezoelectric ceramics through two-step sintering, and belongs to the field of piezoelectric ceramic manufacturing. The preparation method comprises the following steps: mixing and drying initial raw material powder weighed according to a stoichiometric ratio to obtain mixed powder; presintering the mixed powder at high temperature to obtain clinker powder; grinding and sieving the clinker powder, adding a binder for granulation, and then carrying out compression molding to obtain a green body; the green body is heated to the first-step sintering temperature after glue discharging, heat preservation is carried out for 0-60 minutes, then the green body is rapidly cooled to the second-step sintering temperature, and heat preservation is carried out for 1-20 hours. Wherein the first-step sintering temperature and the second-step sintering temperature are determined by means of an Arrhenius diagram of grain growth constants. According to the method provided by the invention, volatilization of alkali metal elements in the sintering process can be inhibited, and the process reproducibility of the potassium-sodium niobate-based piezoelectric ceramic is effectively improved. The method has low requirements on equipment, is easy to control the technological process, and is suitable for industrial production.
本发明公开了一种两步烧结制备铌酸钾钠基压电陶瓷的方法，属于压电陶瓷制造领域。制备方法包括：将按照化学计量比称量好的初始原料粉末进行混合并烘干，得到混合粉料；混合粉料经高温预烧，得到熟料粉末；熟料粉末经研磨、过筛后加入粘结剂进行造粒，然后压制成型，得到生坯；将生坯排胶后加热至第一步烧结温度，保温0~60分钟，随后快速冷却至第二步烧结温度，保温1~20小时。其中第一步烧结温度和第二步烧结温度借助晶粒生长常数的阿累尼乌斯图进行确定。本发明提供的方法，可以抑制烧结过程中碱金属元素的挥发，有效改善铌酸钾钠基压电陶瓷的工艺重现性。该方法对设备要求不高，工艺过程容易控制，适用于工业化生产。
Method for preparing potassium-sodium niobate-based piezoelectric ceramic through two-step sintering
The invention discloses a method for preparing potassium-sodium niobate-based piezoelectric ceramics through two-step sintering, and belongs to the field of piezoelectric ceramic manufacturing. The preparation method comprises the following steps: mixing and drying initial raw material powder weighed according to a stoichiometric ratio to obtain mixed powder; presintering the mixed powder at high temperature to obtain clinker powder; grinding and sieving the clinker powder, adding a binder for granulation, and then carrying out compression molding to obtain a green body; the green body is heated to the first-step sintering temperature after glue discharging, heat preservation is carried out for 0-60 minutes, then the green body is rapidly cooled to the second-step sintering temperature, and heat preservation is carried out for 1-20 hours. Wherein the first-step sintering temperature and the second-step sintering temperature are determined by means of an Arrhenius diagram of grain growth constants. According to the method provided by the invention, volatilization of alkali metal elements in the sintering process can be inhibited, and the process reproducibility of the potassium-sodium niobate-based piezoelectric ceramic is effectively improved. The method has low requirements on equipment, is easy to control the technological process, and is suitable for industrial production.
本发明公开了一种两步烧结制备铌酸钾钠基压电陶瓷的方法，属于压电陶瓷制造领域。制备方法包括：将按照化学计量比称量好的初始原料粉末进行混合并烘干，得到混合粉料；混合粉料经高温预烧，得到熟料粉末；熟料粉末经研磨、过筛后加入粘结剂进行造粒，然后压制成型，得到生坯；将生坯排胶后加热至第一步烧结温度，保温0~60分钟，随后快速冷却至第二步烧结温度，保温1~20小时。其中第一步烧结温度和第二步烧结温度借助晶粒生长常数的阿累尼乌斯图进行确定。本发明提供的方法，可以抑制烧结过程中碱金属元素的挥发，有效改善铌酸钾钠基压电陶瓷的工艺重现性。该方法对设备要求不高，工艺过程容易控制，适用于工业化生产。
Method for preparing potassium-sodium niobate-based piezoelectric ceramic through two-step sintering
一种两步烧结制备铌酸钾钠基压电陶瓷的方法
CHEN YI (author) / PAN YONGQI (author) / HUANG LONGFEI (author) / FENG JIE (author) / XU ZUNPING (author)
2022-12-16
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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