Ferroelectric ceramic micro refrigerator and producing method thereof
A technology of ferroelectric ceramics and refrigerators, which is applied in the operation mode of machines, machines using electric/magnetic effects, refrigerators, etc. application, inability to prepare large-area flakes, etc., to achieve the effect of convenient cooling/heating conversion, enhanced optional work, and light weight
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Embodiment 1
[0060] Embodiment 1: with domestic analysis pure Pb (C 2 h 3 o 2 ) 2 Powder, chemically pure Ti(OC 4 h 9 ) 4 Solvent and Mg(C 2 h 3 o 2 ) 2 and electron pure Nb 2 o 5 Powder, etc. as raw materials, according to Pb (Mg 1 / 3 Nb 2 / 3 )O 3 with PbTiO 3 A formulation with a mol ratio of 85 / 15, and an excess of 4 mol% of Mg and 5 mol% of Pb in the sample. First, the above-mentioned PMNT raw materials meeting the stoichiometric ratio are miscible in an organic solvent of ethylene glycol ether to obtain a white sol (Sol). The sol (Sol) is put into a ball mill jar and fully ball milled for 8 hours. At this time, each raw material component is mixed at a molecular level to obtain a PMNT precursor. The PMNT precursor was placed in an infrared oven to fully dry and gel at 120°C, and then placed in a resistance furnace for pre-calcination at 450°C and 750°C for 2 hours respectively to obtain PMNT pre-crystallized powder. The PMNT pre-crystallized powder is pressed into a gre...
Embodiment 2
[0061] Embodiment 2: with domestic analysis pure Pb (C 2 h 3 o 2 ) 2 Powder, chemically pure Ti(OC 4 h 9 ) 4 Solvent and Mg(C 2 h 3 o 2 ) 2 and electron pure Nb 2 o 5 Powder, etc. as raw materials, according to Pb (Mg 1 / 3 Nb 2 / 3 )O 3 with PbTiO 3 A formulation with a mol ratio of 85 / 15 and an excess of 6 mol % of Mg and 8 mol % of Pb in the sample. First, the above-mentioned PMNT raw materials meeting the stoichiometric ratio are miscible in an organic solvent of ethylene glycol ether to obtain a white sol (Sol). The sol (Sol) is put into a ball mill jar and fully ball milled for 10 hours. At this time, each raw material component is mixed at a molecular level to obtain a PMNT precursor. The PMNT precursor was placed in an infrared oven to fully dry and gel at 180°C, and then placed in a resistance furnace for pre-calcination at 490°C and 800°C for 2 hours respectively to obtain PMNT pre-crystallized powder. The PMNT pre-crystallized powder is pressed into a g...
Embodiment 3
[0062] Embodiment 3: with domestic analysis pure Pb (C 2 h 3 o 2 ) 2 Powder, chemically pure Ti(OC 4 h 9 ) 4 Solvent and Mg(C 2 h 3 o 2) 2 and electron pure Nb 2 o 5 Powder, etc. as raw materials, according to Pb (Mg 1 / 3 Nb 2 / 3 )O 3 with PbTiO 3 A formulation with a mol ratio of 85 / 15, and an excess of 5 mol% of the Mg component and 7 mol% of the Pb component in the sample. First, the above-mentioned PMNT raw materials meeting the stoichiometric ratio are miscible in an organic solvent of ethylene glycol ether to obtain a white sol (Sol). The sol (Sol) was put into a ball mill jar and fully ball milled for 9 hours. At this time, each raw material component was mixed at a molecular level to obtain a PMNT precursor. Put the PMNT precursor into an infrared oven to fully dry and gel at 160°C, then put it into a resistance furnace and pre-fire it at 470°C and 800°C for 2 hours respectively to obtain PMNT pre-crystallized powder. The PMNT pre-crystallized powder is ...
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