Unlock instant, AI-driven research and patent intelligence for your innovation.
Lead free ceramic composition for PTC thermistor and PTC ceramic thermistor thereby
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A ceramic composition, thermistor technology, applied in the direction of resistors, non-adjustable metal resistors, circuits, etc., can solve the problems of infancy and insufficient verification of PTC characteristics.
Inactive Publication Date: 2011-09-07
KOREA INST OF CERAMIC ENG & TECH +1
View PDF4 Cites 6 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0009] However, the PTC properties of the above raw materials have not been fully verified, especially the development of ceramic compositions with high Curie temperatures (High Tc>130°C) for automotive heaters is still in its infancy
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1～ Embodiment 33
[0047] Prepare TiO 2 、 Bi 2 o 3 、Na 2 CO 3 , Nb 2 o 5 , MnO 2 , BaTiO 3 As starting materials, and weighing the above-mentioned raw materials, so that it conforms to form the composition within the range proposed in this application.
[0048] In each sample, a plurality of starting elements were mixed by using a ball mill (Ball mill) for 24 hours of wet ball milling, and the above-mentioned mixed sample was dried at 100-120° C., and the powder was put into a mortar. After crushing, it was put into an aluminacrucible and calcined at 1000° C. for 2 hours.
[0049] The calcined powder was put into a mortar and pulverized, and then wet ball milled with spherical zirconia for 24 hours. Then, after fully drying the mixed sample at 100-120°C, use 1[ton / cm 2 ] of the pressure of the cylindrical mold (10mm) on the sample prepared in the mortar by uniaxial pressing to shape it into a disc (disc)-shaped test piece.
[0050] The uniaxially pressed test pieces were sintered at ...
Embodiment 34～ Embodiment 53
[0059] In addition to preparing TiO 2 、 Bi 2 o 3 、K 2 CO 3 , Nb 2 o 5 , MnO 2 , BaTiO 3 Except for the starting material, a PTC element was manufactured in the same manner as in Example 1 above, and Table 2 below shows the details of the chemical quantification of the samples prepared in Examples 34 to 53 and the measurement of PTC characteristics. result.
[0060] and, Figure 10 to Figure 15 is a graph of the measurement results.
[0061] 【Table 2】
[0062]
[0063]
[0064] [Table 1] and [Table 2], Figure 1 to Figure 15 It shows that the samples satisfying the conditions of 0.01≤x≤0.05, 0c (Curie temperature) is an excellent characteristic above 130°C.
[0065] Also, using high-purity BaTiO 3 (BT) As the main component of the ceramic composition for a PTC thermistor according to an embodiment of the present invention, Na 0.5 K 0.5 NbO 3 (NKN), thereby ensuring a high Curie temperature (High Tc>130°C).
[0066] And, the Nb 2 o 5 Used as an additive ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Property
Measurement
Unit
Curie temperature
aaaaa
aaaaa
Curie temperature
aaaaa
aaaaa
Curie temperature
aaaaa
aaaaa
Login to View More
Abstract
The present invention relates to a ceramic composition for a lead-free PTC thermistor which does not contain a lead (Pb) component and has a low specific resistance value at room temperature and a Curie temperature (Tc) of 130 DEG C or more. The ceramic composition for a lead free PTC thermistor according to the present invention comprises any one selected from formulas 1-4. [Formula 1] Ba1-x(Bi0.5 Na0.5)xTiO3 + y mol% M1Ow [Formula 2] Ba1-x(Bi0.5Na0.5)xTiO3 + y mol% M12Ow + z wt% M2O2 [Formula 3] Ba1-x(Bi0.5K0.5)xTiO3 + y mol% M1Ow [Formula 4] Ba1-x(Bi0.5K0.5)xTiO3 + y mol% M1Ow + z wt% M2O2 (In formulas 1-4, 0.01<=x<=0.05, 0.00<y<=0.40, 0.00<z<=0.40; M1 is one or more elements selected from the group consisting of Nb, Sb, La, Y; M2 is Mn; and w is 3 when M1 is a trivalent element and is 5 when M1 is a pentavalent element.) In addition, the invention comprises a ceramic composition for a PTC thermistor of the following formula 5 in which Na0.5K0.5NbO3(NKN) is formed as a solid solution of BaTiO3(BT). [Formula 5] (1-x)BT-xNKN (0<x=0.05) The invention provides a PTC ceramic thermistor prepared using the compositions of the formulas.
Description
technical field [0001] The present invention relates to a ceramic composition, and more specifically to a ceramic composition for a PTC thermistor that does not contain a lead component. Background technique [0002] PTC (Positive Temperature Coefficient of resistance: positive temperature coefficient of resistance) thermistor exhibits the characteristic that the resistance increases with the increase of temperature, generally BaTiO 3 for the basic composition. [0003] BaTiO 3 (BT) series semiconducting ceramics such as ABO 3 A compound with a representative perovskitecrystal structure, showing a form in which divalent Ba ions occupy the A-site and tetravalent Ti ions occupy the B-site, and the crystal structure shows a transition into a triangular crystal according to the temperature The polymorphic characteristics of rombohedral, orthorhombic, tetragonal and cubic. [0004] In particular, if the 1.5V DC The resistance-temperature characteristic can be obtained by me...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More