Preparation method of garnet with high power and high dielectric constant and garnet
A high dielectric constant, garnet technology, applied in the field of sound source localization, can solve problems that cannot be separated from process design
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example 1
[0040] (1) According to the chemical formula:
[0041] Y 3-x-z-z′-y-2x′-z″-p-q Bi x SM z Gd z′ Ca 2x′+y+z″+p+q Zr y sn p Ti q Ge z″ In p′ V x′ mn w Al w′ Fe 5-x′-y-z″-p-q-w-w′-δ-p′ o 12 ,
[0042] Take x=1.08, y=0.28, z=0.005, z'=0, z"=0, x'=0, p=0, q=0, w=0, p'=0, w'=0, Calculate the amount of raw materials required separately. Use Sm with purity ≥99.9% 2 o 3 , Y 2 o 3 and analytically pure Bi 2 o 3 , Fe 2 o 3 , CaCO 3 , ZrO 2 , Weigh out the corresponding weight of raw materials. Will Sm 2 o 3 、Gd 2 o 3 , Y 2 o 3 Rare earth oxide raw materials are burned at a temperature of 850°C and cooled in the furnace before use.
[0043] (2) Put the weighed raw materials into a ball mill tank, and add steel balls and deionized water or / and alcohol according to the ratio of material: ball: water = 1:2:1.2, and discharge after 12 hours of ball milling. The ball milling tank is made of stainless steel to reduce the abrasive Fe entering the material during t...
example 2
[0054] (1) According to the chemical formula
[0055] Y 3-x-z-z′-y-2x′-z″-p-q Bi x SM z Gd z′ Ca 2x′+y+z″+p+q Zr y sn p Ti q Ge z″ In p′ V x′ mn w Al w′ Fe 5-x′-y-z″-p-q-w-w′-δ-p′ o 12 ,
[0056] Take: x=1.08, y=0.28, z=0.020, z'=0, z"=0, x'=0, p=0, q=0, w=0, p'=0, w'=0 , respectively calculate the amount of raw materials required. Use Sm with purity ≥99.9% 2 o 3 , Y 2 o 3 and analytically pure Bi 2 o 3 , Fe 2 o 3 , CaCO 3 , ZrO 2 As the raw material, weigh out the corresponding weight of the raw material. Will Sm 2 o 3 、Gd 2 o 3 , Y 2 o 3 etc. Rare earth oxide raw materials are burned at a temperature of 1000°C and cooled in the furnace before use.
[0057] (2) Put the weighed raw materials into a ball mill tank, and add steel balls and deionized water according to the ratio of material: ball: water = 1: 3.5: 1, and discharge after a ball mill for 18 hours. The ball milling tank is made of stainless steel to reduce the abrasive Fe entering the...
example 3
[0068] (1) According to the chemical formula
[0069] Y 3-x-z-z′-y-2x′-z″-p-q Bi x SM z Gd z′ Ca 2x′+y+z″+p+q Zr y sn p Ti q Ge z″ In p′ V x′ mn w Al w′ Fe 5-x′-y-z″-p-q-w-w′-δ-p′ o 12 ,
[0070] Take: x=1.06, y=0.30, z=0.01, z'=0, z"=0, x'=0, p=0, q=0, w=0, p'=0, w'=0 , respectively calculate the amount of raw materials required. Use Sm with purity ≥99.9% 2 o 3 , Y 2 o 3 and analytically pure Bi 2 o 3 , Fe 2 o 3 , CaCO 3 , ZrO 2 As the raw material, weigh out the corresponding weight of the raw material. Will Sm 2 o 3 、Gd 2 o 3 , Y 2 o 3 Rare earth oxide raw materials are burned at a temperature of 1200°C and cooled in the furnace before use.
[0071] (2) Put the weighed raw materials into the ball mill tank, and add steel balls and deionized water according to the ratio of material: ball: water = 1: 5: 0.7, and discharge after 24 hours of ball milling once. The ball milling tank is made of stainless steel to reduce the abrasive Fe entering th...
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Abstract
Ti < q > Ge < z '> In<p'> V < x '> Mn < w > Al < w' > Fe < 5-x '-y-z' '-p-q-w-w'-delta-p >O < 12 >, wherein 0<=x<=1.3, 0<=x'<=0.70, 0<=y'<=0.70, 0<=z<=1.0, 0<=z'<=1.0, 0<=z''<=1.5, 0<=p<=0.50, 0<=q<=0.50, 0<=w<=1.30, 0<=p'<=0.50, 0<=w'<=0.10, and the iron deficiency delta is 0 <= delta<= 0.50; (2) primary ball milling; (3) drying, and pre-sintering in an oxidizing atmosphere for the first time; (4) secondary ball milling; (5) after drying, carrying out secondary pre-sintering in an oxidizing atmosphere; (6) carrying out third-time ball milling; (7) drying and granulating, primarily pressing granules into a blank, and then carrying out cold isostatic pressing; and (8) putting a formed blank into a furnace in an oxidizing atmosphere to be sintered at the sintering temperature from 900 DEG C to 1450 DEG C, and the heat preservation time from 30 hours to 100 hours. The high-magnetic-moment garnet material with relatively low delta H, relatively high delta Hk and a high dielectric constant epsilon' is obtained by promoting the solid-phase reaction degree, reducing the formation of a Bi-rich phase and utilizing rare earth ions Sm < 3 + > for substitution in the formula.
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