A thermosensitive ceramic material with high temperature coefficient and its preparation method
A heat-sensitive ceramic and positive temperature coefficient technology, which is applied in the field of heat-sensitive ceramic materials and their preparation, can solve the problems of insufficient temperature coefficient of heat-sensitive ceramic materials, decreased nonlinear performance, low room temperature resistivity, etc., and achieves a simple preparation method Ease of operation, controllable temperature coefficient, high positive temperature coefficient effect
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[0028] The preparation method of the thermosensitive ceramic material comprises the following steps:
[0029] (1) Bismuth oxide, alkali metal oxide or alkali metal carbonate, and titanium dioxide are mixed according to the molar ratio (0.98-1.02): (0.99-1.03):4, preferably according to the molar ratio of 1:1:4, and the After the mixture is calcined, high-purity bismuth sodium titanate or bismuth potassium titanate ceramic powder is obtained; the mixing method is preferably mixed by ball milling, and absolute ethanol is used as a ball milling aid during ball milling. The calcination temperature is 800-950° C., and the calcination time is 1-2 hours.
[0030] In some embodiments, as a preferred mode, step (1) can also be: bismuth oxide, alkali metal oxide or alkali metal carbonate, titanium dioxide according to the molar ratio (0.98-1.02): (0.99-1.03): 4 Mixing, preferably mixing according to the molar ratio of 1:1:4, and adding an appropriate amount of organic monomers, using t...
Embodiment 1
[0039] S1: 58.245g of bismuth oxide, 13.249g of sodium carbonate, and 39.94g of titanium dioxide were ball milled and mixed evenly. The mixture was calcined at 850 degrees Celsius for 1 hour to obtain high-purity bismuth sodium titanate ceramic powder.
[0040] S2: Take 102.79g industrial barium titanate ceramic powder, 7.35g strontium titanate ceramic powder, and 2.12g bismuth sodium titanate ceramic powder, 1.51g calcium titanate, 0.16g yttrium oxide, 0.08g niobium pentoxide, 0.054g Manganese nitrate and 0.45 g of silicon dioxide are ball milled and mixed evenly.
[0041] S3: The ceramic slurry is taken out from the ball mill jar, dried in an oven for 12 hours, and then taken out. After taking it out, grind the block into powder, and pass through a 40-mesh sieve. Add an appropriate amount of PVA glue to the raw powder, mix well, and pass through a 60-mesh sieve. Finally, about 1 g of raw powder is taken, and pressed into a tablet using a mold to obtain a shaped embryo bod...
Embodiment 2
[0046] The preparation steps of this example are the same as those of Example 1, except that 3.18 g of sodium bismuth titanate and 101.62 g of barium titanate are used in step S2, and the others are the same.
[0047] The chemical formula of the main component of the thermosensitive ceramic material prepared in this embodiment is (Ca 0.03 (Bi 0.5 Na 0.5 ) 0.03 Sr 0.07 Ba 0.87 ) Ti 1.01 o 3 .
[0048] image 3 is the resistance-temperature curve of the barium titanate thermistor prepared in this example, from image 3 It can be seen that as the temperature increases, the resistance increases rapidly up to a maximum value. The ascent section is steep, showing its excellent nonlinear performance.
[0049] The electrical performance parameters of the barium titanate heat-sensitive ceramics prepared in this example are: room temperature resistivity 711.2Ω cm, lift-to-drag ratio R max / R min =8.5×10 6 , temperature coefficient (α (10 / 25) ) 39.04%, switch temperature 11...
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