Method for preparing SnO2-Zn2SnO4 composite voltage-sensitive ceramics
A technology of varistor ceramics and powder materials, applied in varistors, varistor cores, etc., can solve complex problems and achieve the effect of simple process
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Embodiment 1
[0021] A kind of SnO 2 -Zn 2 SnO 4 Composite pressure-sensitive ceramics, the preparation method of which is:
[0022] 1) Zn 2 SnO 4 Preparation of powder
[0023] The analytically pure chemical reagent SnO 2 Mix with ZnO in a molar ratio of 1:2, and put it into a nylon ball mill tank, then add alcohol and ball mill for 12 hours at a speed of 120 rpm to obtain a slurry;
[0024] After the ball milled slurry is dried at 21°C~150°C, it is sent into a powder tablet press, and pressed into a disc with a diameter of 30 mm under the condition of 80 MPa, and then sent into a muffle furnace. Calcined at 1000°C for 2 hours, then naturally cooled to 20°C and crushed to obtain Zn 2 SnO 4 Powder, spare;
[0025] 2) Weigh and analyze 0.82mol pure chemical reagent SnO 2 and 0.18mol Zn prepared in Step 1 2 SnO 4 The powder is dry mixed, then put into a nylon ball mill tank, and ball milled with alcohol at a speed of 120 rpm for 12 hours to obtain a slurry for subsequent use;
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Embodiment 2
[0029] A kind of SnO 2 -Zn 2 SnO 4 Composite pressure-sensitive ceramics, the preparation method of which is:
[0030] 1) Zn 2 SnO 4 The preparation of powder, with embodiment 1;
[0031] 2) Weigh the analytically pure chemical reagent SnO 2 0.84mol and Zn prepared in step 1 2 SnO 4 0.16 mol of the powder was dry mixed, then loaded into a nylon ball mill tank, and ball milled with alcohol for 12 hours at a speed of 120 rpm to obtain a slurry for subsequent use;
[0032] Dry the milled slurry at 21°C~150°C and weigh it, then add 8% of its weight and 10% polyvinyl alcohol solution to it, and press it into tablets under a pressure of 160MPa Machine pressed into discs with a diameter of 15 mm and a thickness of 1.5 mm, and set aside;
[0033] 3) Debinding the wafer prepared in step 2 at 650°C for 1 hour, then sintering at 1300°C for 2 hours, and then naturally cooling to 21°C to obtain the product.
Embodiment 3
[0035] A kind of SnO 2 -Zn 2 SnO 4 Composite pressure-sensitive ceramics, the preparation method of which is:
[0036] 1) Zn 2 SnO 4 The preparation of powder, with embodiment 1;
[0037] 2) Weigh the analytically pure chemical reagent SnO 2 0.86mol and Zn prepared in step 1 2 SnO 4 0.14 mol of the powder was dry mixed, then loaded into a nylon ball mill tank, and ball milled with alcohol for 12 hours at a speed of 120 rpm to obtain a slurry for subsequent use;
[0038] Dry the ball-milled slurry at 21°C~150°C and weigh it, then add 4% of its weight and 10% polyvinyl alcohol solution to it, and press it into tablets under a pressure of 160MPa Machine pressed into discs with a diameter of 15 mm and a thickness of 1.5 mm, and set aside;
[0039]3) Debinding the wafer prepared in step 2 at 650°C for 1 hour, then sintering at 1300°C for 2 hours, and then naturally cooling to 21°C to obtain the product.
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