High-voltage-resistant ceramic material and preparation method thereof
A ceramic material, high withstand voltage technology, applied in the field of ceramic materials doped with Nb2O5-CaO-Bi2O3 series
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[0039] The preparation method of the ceramic material of the present invention is a traditional oxide synthesis and sintering process. The specific process includes:
[0040] (1) Ingredients: CP or AR grade Nb 2 o 5 , CaCO 3 、 Bi 2 o 3 , Y 2 o 3 , La 2 o 3 , MnO 2 、WO 3 etc. as raw materials, press xNb 2 o 5 -yCaO-zBi 2 o 3 The stoichiometric ratio of +αA is accurately weighed;
[0041] (2) Ball mill mixing: use absolute ethanol as the medium, and planetary ball mill for more than 5 hours. discharge drying;
[0042] (3) Synthesis: the powder is packed in a corundum crucible and synthesized at 700-1000°C for 1-4 hours;
[0043] (4) Synthetic material ball milling: the synthetic material is pulverized, passed through a 40-mesh sieve, using absolute ethanol as a medium, and ball milling with a planetary ball mill for 4-6 hours. The output is dry. Molding: powder plus binder, manual granulation, use 2T / cm 2 The pressure is pressed into a disc with a diameter of...
Embodiment 1
[0047] According to the general formula xNb 2 o 5 -yCaO-zBi 2 o 3 +αA. where A represents 1mol x Nb 2 o 5 -yCaO-zBi 2 o 3 For A, doped with αmol, x+y+z=1, the range of values of x, y, and z is shown in the area shown in the phase diagram ( figure 1 ); A is one or more of Y, K, La, W, Mn;
[0048] Take x=0.35, y=0.31, z=0.34, A is W, α=0.01, and use CP or AR grade chemical reagent Nb 2 o 5 , CaCO 3 、 Bi 2 o 3 、WO 3 As the raw material, after fully drying, weigh according to the above formula stoichiometrically;
[0049] Use absolute ethanol as the medium, and mix by ball milling for 3 hours. Dry, sieve, and synthesize the powder in a corundum crucible at 850°C / 2 hours. Then pulverize and sieve, ball mill for 3 hours, dry, add binder, dry press and shape, after plastic discharge, adopt the above-mentioned oxygen-passing sintering method to sinter. Its dielectric constant is about 90 and does not change much with frequency, see image 3 ;The dielectric loss is...
Embodiment 2
[0051] According to the general formula xNb 2 o 5 -yCaO-zBi 2 o 3 +αA, take x=0.31, y=0.27, z=0.42, A is 0.03mol Mn and 0.01mol La, α=0.03+0.01, use CP or AR grade chemical reagent Nb 2 o 5 , CaCO 3 、 Bi 2 o 3 , MnO 2 , La 2 o 3 As the raw material, after fully drying, weigh according to the above formula stoichiometrically;
[0052] Use absolute ethanol as the medium, and mix by ball milling for 5 hours. Dry, sieve, and synthesize the powder in a corundum crucible at 800°C / 3 hours. Then pulverize and sieve, ball mill for 5 hours, dry, add binder, dry press molding, after plastic discharge, use the above-mentioned oxygen-passing sintering method to sinter. Its dielectric constant is around 110; the ceramic presents a very dense microstructure, see figure 2 ; 1.5mm thickness of ceramic pulse resistance up to 20,000 volts.
[0053] The high pressure resistance value of several groups of typical formulations in the ceramic system of the present invention in table 1...
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