Negative temperature coefficient (NTC) material utilized at high temperature and preparation method thereof
A high temperature, raw material technology, applied in the field of NTC materials and its preparation, can solve the problems of low resistivity and low resistance drift rate
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Embodiment 1
[0029] The raw material component of the present embodiment is: 5wt.% La 2 o 3 , 5wt.%ZrO 2 , the rest is Ni 0.6 mn 1.8 al 0.6 o 4 .
[0030] This embodiment includes the following steps:
[0031] Step 1, according to Ni 0.6 mn 1.8 al 0.6 o 4 Weigh the various oxide starting materials, namely MnO, at the stoichiometric molar ratios shown in 2 , NiO, Al2 o 3 , it was mixed evenly by wet ball milling, using absolute ethanol and agate balls as the ball milling medium, the volume ratio of raw materials and absolute ethanol was 1:2, the volume ratio of balls and materials was 2.5:1, and the ball milling time was controlled 8 hours, the power of the ball mill is 0.75KW;
[0032] Step 2. Ni after ball milling 0.6 mn 1.8 Al 0.6 o 4 The powder is dried, and the dried powder is pre-fired at 900°C for 3 hours in an air atmosphere, and the heating rate is 3°C / min;
[0033] Step 3, the pre-burned Ni 0.6 mn 1.8 Al 0.6 o 4 Powder and 5wt.% La 2 o 3 Powder, 5wt.%ZrO 2...
Embodiment 2
[0037] The raw material component of the present embodiment is: 5wt.% La 2 o 3 , 7.5wt.%ZrO 2 , the rest is Ni 0.6 mn 1.8 Al 0.6 o 4 .
[0038] This embodiment includes the following steps:
[0039] Step 1, according to Ni 0.6 mn 1.8 Al 0.6 o 4 Stoichiometric molar ratios shown Weighing various oxide starting materials, i.e. MnO 2 , NiO, Al 2 o 3 , it was mixed evenly by wet ball milling, using absolute ethanol and agate balls as the ball milling medium, the volume ratio of raw materials and absolute ethanol was 1:2, the volume ratio of balls and materials was 2.5:1, and the ball milling time was controlled 10 hours, the power of the ball mill is 0.75KW;
[0040] Step 2. Ni after ball milling 0.6 mn 1.8 Al 0.6 o 4 The powder is dried, and the dried powder is pre-fired at 1000° C. for 1 hour in an air atmosphere, and the heating rate is 5° C. / min.
[0041] Step 3, the pre-burned Ni 0.6 mn 1.8 Al 0.6 o 4 Powder and 5wt.% La 2 o 3 Powder, 7.5wt.%ZrO 2 Ba...
PUM
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