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Preparation method of potassium-sodium niobate-based nano fine-grain ceramic with average grain size of 160nm
The invention relates to a preparation method of potassium-sodium niobate-based nano fine-grain ceramic with the average grain size of 160nm. 0.5 mol% of lanthanum oxide is added into raw materials, so that oxygen vacancies generated by volatilization of alkali metal elements can be reduced, meanwhile, growth of grains is hindered, and the purpose of refining the grains is achieved. The preparation method comprises the following steps: calcining dried powder subjected to ball milling for 12-18 hours at 800-900 DEG C for 2-4 hours, carrying out secondary ball milling for 12-18 hours, performing calcining at 800-900 DEG C again after drying for 2-4 hours, carrying out tertiary ball milling for 12-18 hours, performing drying, and carrying out multiple times of ball milling and calcining to enable raw materials to fully react and refine, so the sintering temperature and the heat preservation time can be reduced, and the purpose of grain refinement is achieved due to insufficient grain growth. Through doping modification of a rare earth element lanthanum and an improved traditional solid phase method, a scanning electron microscope diagram and a particle size distribution diagram of the finally obtained potassium-sodium niobate-based ceramic are shown in a figure 2, the average grain size of the potassium-sodium niobate-based ceramic is 160nm, and the grain size distribution is uniform and very fine.
本发明涉及一种平均晶粒尺寸为160nm的铌酸钾钠基纳米细晶陶瓷的制备方法，通过向原料中加入0.5％mol氧化镧，可以减少由于碱金属元素挥发产生的氧空位，同时阻碍了晶粒的生长，达到细化晶粒的目的。通过将球磨12‑18h后烘干的粉末在800‑900℃下煅烧2‑4h，二次球磨12‑18h，烘干后再次在800‑900℃下煅烧2‑4h，之后进行三次球磨12‑18h并烘干，多次球磨和煅烧使得原料充分反应并细化，可以降低烧结的温度和保温的时间，使晶粒长大不充分而达到细化晶粒的目的。通过稀土元素镧的掺杂改性和改进的传统固相法，最终得到的铌酸钾钠基陶瓷的扫描电镜图及粒径分布图如附图2所示，其平均晶粒尺寸为160nm，晶粒尺寸分布均匀且十分细小。
Preparation method of potassium-sodium niobate-based nano fine-grain ceramic with average grain size of 160nm
The invention relates to a preparation method of potassium-sodium niobate-based nano fine-grain ceramic with the average grain size of 160nm. 0.5 mol% of lanthanum oxide is added into raw materials, so that oxygen vacancies generated by volatilization of alkali metal elements can be reduced, meanwhile, growth of grains is hindered, and the purpose of refining the grains is achieved. The preparation method comprises the following steps: calcining dried powder subjected to ball milling for 12-18 hours at 800-900 DEG C for 2-4 hours, carrying out secondary ball milling for 12-18 hours, performing calcining at 800-900 DEG C again after drying for 2-4 hours, carrying out tertiary ball milling for 12-18 hours, performing drying, and carrying out multiple times of ball milling and calcining to enable raw materials to fully react and refine, so the sintering temperature and the heat preservation time can be reduced, and the purpose of grain refinement is achieved due to insufficient grain growth. Through doping modification of a rare earth element lanthanum and an improved traditional solid phase method, a scanning electron microscope diagram and a particle size distribution diagram of the finally obtained potassium-sodium niobate-based ceramic are shown in a figure 2, the average grain size of the potassium-sodium niobate-based ceramic is 160nm, and the grain size distribution is uniform and very fine.
本发明涉及一种平均晶粒尺寸为160nm的铌酸钾钠基纳米细晶陶瓷的制备方法，通过向原料中加入0.5％mol氧化镧，可以减少由于碱金属元素挥发产生的氧空位，同时阻碍了晶粒的生长，达到细化晶粒的目的。通过将球磨12‑18h后烘干的粉末在800‑900℃下煅烧2‑4h，二次球磨12‑18h，烘干后再次在800‑900℃下煅烧2‑4h，之后进行三次球磨12‑18h并烘干，多次球磨和煅烧使得原料充分反应并细化，可以降低烧结的温度和保温的时间，使晶粒长大不充分而达到细化晶粒的目的。通过稀土元素镧的掺杂改性和改进的传统固相法，最终得到的铌酸钾钠基陶瓷的扫描电镜图及粒径分布图如附图2所示，其平均晶粒尺寸为160nm，晶粒尺寸分布均匀且十分细小。
Preparation method of potassium-sodium niobate-based nano fine-grain ceramic with average grain size of 160nm
一种平均晶粒尺寸为160nm的铌酸钾钠基纳米细晶陶瓷的制备方法
FAN HUIQING (author) / QUAN QIFENG (author) / WANG WEIJIA (author)
2021-06-04
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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