Pyroelectric ceramic material and preparation method thereof
A technology of pyroelectric ceramics and ceramic powders, which is applied in the field of ceramic materials, can solve the problems of limited practical application and large thermal hysteresis, and achieves a wide application temperature range, low dielectric loss, stable and moderate pyroelectric coefficient. Effect
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Embodiment 1
[0032] a) According to the general formula: (Pb 1.005 )(Mg 1 / 3 Nb 2 / 3 ) 0.07 (Zr 0.83 sn 0.02 Ti 0.15 ) 0.93 o 3 +4.5at.%Mn Weigh Pb in stoichiometric ratio 3 o 4 229.7g, ZrO 2 94.9g, TiO 2 11.2g, SnO 2 21.4g, MnCO 3 27.1g, Nb 2 o 5 6.2g, Mg 2 (OH) 2 CO 3 1.7g, then add 0.3g Al2 o 3 and 0.3g SiO 2 Add deionized water 313.8g, material: ball: water=1: 1.5: 0.7, carry out wet ball milling 24 hours with agate ball as ball milling medium; Oven dry, briquette, synthesize under air atmosphere: with 2 ℃ / min The heating rate was raised to 830°C, and then kept for 2 hours to obtain ceramic powder;
[0033] b) The ceramic powder obtained in step a) is finely ground for 24 hours by wet ball milling method, material: ball: water=1: 1.8: 0.6, and the ball milling medium is agate ball; after drying, add 10 g of PVA with a concentration of 6wt.%. The aqueous solution is used as a binder for granulation, then aged for 22 hours, pressed and molded, and ejected at 800...
Embodiment 2
[0040] a) According to the general formula: (Pb 1.005 )(Mg 1 / 3 Nb 2 / 3 ) 0.07 (Zr 0.83 sn 0.02 Ti 0.15 ) 0.93 o 3 +3at.%Mn+0.3at.%Fe to weigh the stoichiometric ratio of Pb 3 o 4 229.7g, ZrO 2 94.9g, TiO 2 11.2g, SnO 2 21.4g, MnCO 3 17.8g, Fe 2 o 3 1.2g, Nb 2 o 5 6.2g, Mg 2 (OH) 2 CO 3 1.7g, then add 0.3g Al 2 o 3 and 0.3g SiO 2 Add deionized water 313.8g, material: ball: water=1: 1.5: 0.7, carry out wet ball milling 24 hours with agate ball as ball milling medium; Oven dry, briquette, synthesize under air atmosphere: with 2 ℃ / min The heating rate was increased to 880°C, and then kept for 1 hour to obtain ceramic powder;
[0041] b) The ceramic powder obtained in step a) is finely ground for 28 hours by wet ball milling, material: ball: water=1: 1.6: 0.5, the ball milling medium is agate balls; after drying, add 12g of PVA with a concentration of 5wt.%. The aqueous solution is used as a binder for granulation, then aged for 26 hours, pressed and ...
Embodiment 3
[0047] a) According to the general formula: (Pb 1.005 )(Mg 1 / 3 Nb 2 / 3 ) 0.07 (Zr 0.83 sn 0.02 Ti 0.15 ) 0.93 o 3 +3at.%Mn Weigh Pb in stoichiometric ratio 3 o 4 229.7g, ZrO 2 94.9g, TiO 2 11.2g, SnO 2 21.4g, MnCO 3 17.8g, Nb 2 o 5 6.2g, Mg 2 (OH) 2 CO 3 1.7g, then add 0.3g Al 2 o 3 and 0.3g SiO 2 Add deionized water 313.8g, material: ball: water=1: 1.5: 0.7, carry out wet ball milling 24 hours with agate ball as ball milling medium; Oven dry, briquette, synthesize under air atmosphere: with 2 ℃ / min The heating rate was increased to 800°C, and then kept for 3 hours to obtain ceramic powder;
[0048] b) The ceramic powder obtained in step a) is finely ground for 20 hours by wet ball milling, material: ball: water = 1: 1.6: 0.5, and the ball milling medium is agate ball; after drying, add 7.5g of 8wt.% PVA aqueous solution is used as a binder to granulate, then aged for 24 hours, pressed and molded, and ejected at 850°C to obtain a ceramic green body; ...
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