Patent Application
20200203595
This non-provisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No(s). 107146991 filed in Taiwan R.O.C on Dec. 25, 2018, the entire contents of which are hereby incorporated by reference.
This present disclosure relates to a piezoelectric composite material including ceramic fiber and a shoe including the piezoelectric composite material.
With the development of technology, the demand for wearable devices is gradually increasing, and people have more requirements on the functions of wearable devices. At present, the wearable devices on the market often need additional power supply module (such as battery) to achieve the functions required by consumers, but the additional power supply is unfavorable for portability.
As to some wearable devices, the power supply module is replaced with piezoelectric material to supply electric power. For example, a soft composite containing piezoelectric material is disposed on the bottom of a shoe sole. When a user wearing the shoe is walking or running, the piezoelectric material in the soft composite generates pulsed current according to the stress difference caused by body weight. The pulsed current can be used to store electricity for self-power generating function and produce physiological activity signals.
According to one aspect of the present disclosure, a piezoelectric composite material includes a cross-linker and a plurality of ceramic fibers disposed in the cross-linker. The ceramic fibers include ABO3 oxide. A-site represents PbxLay containing lead (Pb) and lanthanum (La), and the following conditions are satisfied:
0.920≤x≤0.950; and
0.050≤y≤0.080.
According to another aspect of the present disclosure, a shoe includes the aforementioned piezoelectric composite material.
According to still another aspect of the present disclosure, a ceramic fiber includes ABO3 oxide. A-site represents PbxLay containing lead (Pb) and lanthanum (La), and the following conditions are satisfied:
0.920≤x≤0.950; and
0.050≤y≤0.080.
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawings.
According to one embodiment of the present disclosure, a piezoelectric composite material includes a cross-linker and a plurality of ceramic fibers. Please refer to
The cross-linker 10, for example but not limited to, is made of polymer such as Polyethylene, polyvinyl chloride, chlorinated polyethylene, polyethylene acetate, polystyrene acrylic acid, epoxy resin, polyphthalate diallyl ester and the like. It is noted that the present disclosure is not limited by the aforementioned cross-linker.
The ceramic fiber 20 includes ABO3 (perovskite) oxide, and the PZT (Lead zirconate titanate) structure is composed of ABO3 oxide. In this embodiment, A-site represents divalent metal ion(s), and B-site represents quadrivalent metal ion or a group of ions with quadrivalence. In one embodiment, A-site contains lead (Pb) and lanthanum (La), and B-site is selected from the group consisting of titanium (Ti), zirconium (Zr), Manganese (Mn), cobalt (Co), niobium (Nb), Iron (Fe), zinc (Zn), Magnesium (Mg), Yttrium (Y), tin (Sn), nickel (Ni), tungsten (W) and combination thereof. It is noted that the present disclosure is not limited by the aforementioned B-site ions.
With regard to ABO3 oxide in the present disclosure, A-site represents PbxLay, and the following conditions are satisfied: 0.920≤x≤0.950; and 0.050≤y≤0.080. Therefore, ABO3 oxide is favorable for the ceramic fiber 20 enjoying good piezoelectricity. In some embodiments, in PbxLay, x is equal to 0.950 and y is equal to 0.050.
As shown in
According to one embodiment of the present disclosure, the fiber volume ratio in the piezoelectric composite material 1 is from 60.0% to 90.0%; that is, 60.0% to 90.0% of ceramic fibers 20 are existed in the entire volume of the piezoelectric composite material 1. Therefore, piezoelectric composite material 1 It is favorable for the piezoelectric composite material 1 having good sensitivity such that the piezoelectric composite material 1 can generate electricity by less stress, and thereby suitable to be applied in wearable products. In some embodiments, the fiber volume ratio in the piezoelectric composite material 1 is from 80.0% to 90.0%.
According to one embodiment of the present disclosure, the piezoelectric coefficient d33 of the ceramic fiber 20 is greater than or equal to 700.0 pC/N. Please further refer to
As shown in
According to one embodiment of the present disclosure, piezoelectric composite material is applicable to shoe making.
In the following paragraphs, several specific embodiments and comparative examples are provided to illustrate the technical effects of the piezoelectric composite material according to the present disclosure.
A piezoelectric composite material with a configuration in
A piezoelectric composite material with a configuration in
A piezoelectric composite material with a configuration in
A piezoelectric composite material with a configuration in
A piezoelectric composite material with a configuration in
A piezoelectric composite material with a configuration in
The detailed piezoelectricity of the embodiments and examples is shown in Table I below.
Referring to TABLE I, when A-site in ABO3 oxide satisfies the conditions of 0.920≤x≤0.950 and 0.050≤y≤0.080, the piezoelectric coefficient d33 of the ceramic fiber is greater than or equal to 700 pC/N, and such high piezoelectric coefficient d33 provides good piezoelectricity. Moreover, the ceramic fiber has much higher piezoelectric coefficient d33 when x is equal to 0.930, and y is equal to 0.070.
A mass (force) is applied on the piezoelectric composite material of embodiment 1, and the voltage generated by the piezoelectric composite material is measured so as to confirm a relationship between the applied stress and the generated voltage. The detailed result is shown in Table II below.
According to the disclosure, the ceramic fibers in the piezoelectric composite material include ABO3 oxide. A-site represents PbxLay containing Pb and La, and the following conditions are satisfied: 0.920≤x≤0.950; and 0.050≤y≤0.080. Therefore, ABO3 oxide with specific composition is favorable for the ceramic fibers enjoying good piezoelectricity, that is, a higher piezoelectric coefficient d33.
Furthermore, since higher piezoelectric coefficient d33, the ceramic fiber is sensitive to less stress even though it has small size, such that the ceramic fiber is applicable to wearable products such as shoe.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present disclosure. It is intended that the specification and examples be considered as exemplary embodiments only, with a scope of the disclosure being indicated by the following claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 107146991 | Dec 2018 | TW | national |
