PTC thermistor ceramic composition and PTC thermistor element
US-9697935-B2 · Jul 4, 2017 · US
Semiconductor Ceramic Composition And PTC Thermistor
US2017229219A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2017229219-A1 |
| Application number | US-201715409989-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jan 19, 2017 |
| Priority date | Feb 8, 2016 |
| Publication date | Aug 10, 2017 |
| Grant date | — |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A semiconductor ceramic composition which is a BaTiO 3 based semiconductor ceramic composition, wherein, part of Ba is replaced by at least A (at least one alkali metal element selected from Na and K), Bi and RE (at least one element selected from rare earth elements including Y), and part of Ti is replaced by at least TM (at least one element selected from the group including of V, Nb and Ta), the relationships of 0.7≦{(the content of Bi)/(the content of A)}≦1.43, 0.017≦{(the content of Bi)+(the content of A)}≦0.25, and 0<{(the content of RE)+(the content of TM)}≦0.01 are satisfied when the total content of Ti and TM is set as 1 mol, the grain sizes have a maximum peak in a grain size distribution in a range of 1.1 μm to 4.0 μm or less, and the distribution frequency of the peak is 20% or more.
First claim
Opening claim text (preview).
What is claimed is: 1 . A semiconductor ceramic composition which is a BaTiO 3 based semiconductor ceramic composition, wherein, part of Ba is replaced by at least A, Bi and RE, and part of Ti is replaced by at least TM, wherein A represents at least one alkali metal element selected from the group consisting of Na and K, RE represents at least one element selected from rare earth elements including Y, and TM represents at least one element selected from the group consisting of V, Nb and Ta, the relationships of 0.7≦{(the content of Bi)/(the content of A)}≦1.43, 0.017≦{(the content of Bi)+(the content of A)}≦0.25, and 0<{(the content of RE)+(the content of TM)}≦0.01 are satisfied when the total content of Ti and TM is set as 1 mol, the semiconductor ceramic composition is composed of several crystal grains, the grain sizes of the several crystal grains have a maximum peak in a grain size distribution in a range of 1.1 μm or more and 4.0 μm or less, and the distribution frequency of the peak is 20% or more. 2 . A PTC thermistor comprising a ceramic body and a pair of electrodes formed on surfaces of the ceramic body, wherein, the ceramic body is formed by using the semiconductor ceramic composition of claim 1 .
Assignees
Inventors
Classifications
- C04B35/4682Primary
based on BaTiO3 perovskite phase · CPC title
Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate · CPC title
characterised by specific heating conditions during heat treatment · CPC title
Mixing media, e.g. organic solvents · CPC title
Making the green bodies or pre-forms by moulding · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US2017229219A1 cover?
- A semiconductor ceramic composition which is a BaTiO 3 based semiconductor ceramic composition, wherein, part of Ba is replaced by at least A (at least one alkali metal element selected from Na and K), Bi and RE (at least one element selected from rare earth elements including Y), and part of Ti is replaced by at least TM (at least one element selected from the group including of V, Nb and Ta)…
- Who is the assignee on this patent?
- Tdk Corp
- What technology area does this patent fall under?
- Primary CPC classification C04B35/4682. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Aug 10 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).