Microwave sintered lead-free high energy density ST/NBT (nitroblue tetrazolium) ceramic material and preparation method thereof
A technology of high energy storage density and ceramic material, applied in the parts of fixed capacitors, fixed capacitor dielectrics, etc., can solve the problems of low energy storage density and unsuitable for practical applications, and achieve high energy storage density and improved polarization strength. , the effect of increasing polarization
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[0031] A kind of preparation method of the lead-free high energy storage density ST-NBT ceramic material of microwave sintering, comprises the following steps:
[0032] Step 1: Prepare pure-phase ST and pure-phase NBT for future use. Weigh SrCO according to the molar ratio of 1:1 3 and TiO 2 Mix to form mixture A; weigh Bi according to the molar ratio 1:1:4 2 o 3 , Na 2 CO 3 and TiO 2 Mix to form Mixture B. SrCO 3 , Bi 2 o 3 , Na 2 CO 3 and TiO 2 The purity is above 99.0%.
[0033] Step 2: Mix mixtures A and B with zirconium balls and deionized water respectively, according to the mass ratio of 1:2:(0.8~1), 1:2:(1.5~2), and then use a planetary ball mill for ball milling 20-24 hours, then dried at 85°C for 14-16 hours, after briquetting, placed in a box-type furnace for 2.5-3 hours at 1150-1180°C and 4-5 hours at 840-850°C to form ST Powder and NBT powder, spare;
[0034] Step 3: According to the stoichiometric formula (1-x) ST-xNBT (x = 0.15, 0.18, 0.20, 0.25)...
Embodiment 1
[0040] The microwave sintered lead-free high energy storage density ST-NBT ceramic material of the present invention has a formula of (1-x)ST-xNBT, wherein x=0.15, and x is the mole percentage.
[0041] Step 1: Prepare pure-phase ST and pure-phase NBT for future use. Weigh SrCO according to the molar ratio of 1:1 3 and TiO 2 Mix to form mixture A; weigh Bi according to the molar ratio 1:1:4 2 o 3 , Na 2 CO 3 and TiO 2 Mix to form Mixture B. SrCO 3 , Bi 2 o 3 , Na 2 CO 3 and TiO 2 The purity is above 99.0%.
[0042] Step 2: Mix mixtures A and B with zirconium balls and deionized water respectively, according to the mass ratio of 1:2:0.8 and 1:2:1.5, and then use a planetary ball mill for 24 hours, then dry at 85°C 14h, after briquetting, put it in a box-type furnace for 2.5 hours at 1160°C and 4 hours at 845°C to form ST powder and NBT powder respectively for later use;
[0043] Step 3: According to the stoichiometric formula 0.85ST-0.15NBT, take ST powder and NB...
Embodiment 2
[0048] The microwave sintered lead-free ST-NBT ceramic material with high energy storage density of the present invention has a formula of (1-x)ST-xNBT, wherein x=0.20, and x is the mole percentage.
[0049] Step 1: Prepare pure-phase ST and pure-phase NBT for future use. Weigh SrCO according to the molar ratio of 1:1 3 and TiO 2 Mix to form mixture A; weigh Bi according to the molar ratio 1:1:4 2 o 3 , Na 2 CO 3 and TiO 2 Mix to form Mixture B. SrCO 3 , Bi 2 o 3 , Na 2 CO 3 and TiO 2 The purity is above 99.0%.
[0050] Step 2: Mix mixtures A and B with zirconium balls and deionized water respectively according to the mass ratio of 1:2:1 and 1:2:2, then use a planetary ball mill for 22 hours, and then dry at 85°C 15h, after briquetting, put it in a box-type furnace for 3 hours at 1170°C and 5 hours at 840°C to form ST powder and NBT powder respectively for later use;
[0051] Step 3: According to the stoichiometric formula 0.8ST-0.2NBT, take ST powder and NBT po...
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