Low-voltage and low-resistance thermal element and preparation method thereof
A heat-resistant, low-voltage technology, which is used in thermometers, measuring heat, and instruments that are directly sensitive to heat and electric/magnetic components, and can solve problems such as large resistance values, long warm-up times for heaters, and slow heating speeds for heaters, etc. problem, to achieve the effect of large adjustment flexibility
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[0064] The second embodiment of the present invention proposes a method for preparing a low-voltage, low-resistance heat-sensitive element of any of the above-mentioned technical solutions, including:
[0065] Pressing the blank, the blank includes the main material and the added material; making the various raw materials into a blank of a heat-sensitive element through batching, ball milling, granulation, and molding processes;
[0066] After the first temperature rise, heat preservation and decompression of the billet; this process decomposes and removes moisture and organic matter in the element. The process is accompanied by gas discharge, and the heating rate of this process should not be too fast, otherwise it will cause cracking and deformation of the components; a specific operation is to put the pressed billet into the sintering furnace, and raise the temperature from room temperature at a heating rate of 200°C / h Heat at 600°C for 30 minutes;
[0067] The billet is pre...
Embodiment 1
[0078] Embodiment 1 is used to make the low-pressure low-resistance thermosensitive element of Curie temperature 170 ℃:
[0079] Weigh the ingredients according to the quantity required by the formula: BaTiO 3 :249.9Kg, PbTiO 3 :50.1Kg, Y 2 o 3 : 0.534Kg, La 2 o 3 : 0.578Kg, MnO 2 : 0.041Kg, AlN: 0.039Kg, Si 3 N 4 : 0.995Kg, CaCO 3 : 2.366Kg, TiO 2 : 1.889Kg, BN: 0.733Kg;
[0080] After ball milling, crushing, granulation, and molding processes, an annular blank with an outer circle of 14.5 mm, an inner circle of 7.2 mm, and a thickness of 1.2 mm is made;
[0081] After sintering, the formed heat-sensitive blanks are neatly stacked in the ashtray and put into the sintering furnace. The heating rate from room temperature to 600°C is 200°C / hour, the temperature is kept at 600°C for 30 minutes, the heating rate is 300°C / hour from 600°C to 900°C, the heating rate is 500°C / hour from 900°C to 1260°C, and the temperature is kept at 1260°C for 5 minutes , 1260 ℃ to 900 ℃ c...
Embodiment 2
[0083] Embodiment 2 is used to make a low-voltage low-resistance thermal element with a Curie temperature of 250°C:
[0084] Weigh the ingredients according to the quantity required by the formula: BaTiO 3 :219.85Kg, PbTiO 3 :80.15Kg, Y2O 3 : 0.534Kg, La 2 o 3 : 0.578Kg, MnO 2 : 0.041Kg, AlN: 0.039Kg, Si 3 N 4 : 0.995Kg, CaCO 3 : 2.366Kg, TiO 2 : 1.889Kg, BN: 0.733Kg;
[0085] After ball milling, crushing, granulation, and molding processes, an annular blank with an outer circle of 14.5 mm and an inner circle of 7.2 mm and a thickness of 1.2 mm is made;
[0086] After sintering, the formed heat-sensitive blanks are neatly stacked in the ashtray and put into the sintering furnace. The heating rate from room temperature to 600°C is 200°C / hour, the temperature is kept at 600°C for 30 minutes, the heating rate is 300°C / hour from 600°C to 900°C, the heating rate is 700°C / hour from 900°C to 1240°C, and the temperature is kept at 1240°C for 1 minute , 1240 ℃ to 900 ℃ cooli...
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