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KR-102964148-B1 - Ceramic materials, compacts, sintered bodies, and articles

KR102964148B1KR 102964148 B1KR102964148 B1KR 102964148B1KR-102964148-B1

Abstract

The ceramic material of the present invention comprises a La-Mo-based composite oxide and at least one first element selected from the group consisting of Si and Al, wherein the content of the first element exceeds 0 mass% and is 0.5 mass% or less.

Inventors

  • 쇼지 마오
  • 고즈카 히사시
  • 오키무라 야스유키
  • 나카지마 아키라

Assignees

  • 니혼도꾸슈도교 가부시키가이샤
  • 고쿠리츠다이가쿠호진 도쿄가가쿠 다이가쿠

Dates

Publication Date
20260512
Application Date
20220406
Priority Date
20210408

Claims (7)

  1. A ceramic material comprising a La-Mo-based composite oxide, at least one first element selected from the group consisting of Si and Al, and at least one second element selected from the group consisting of Ca, Mg, Ni, Co, Na, S, Sr, Y, Zn, and B, and not comprising harmful elements from the group consisting of Cd, Hg, Pb, Ra, and U, wherein the content of the first element exceeds 0 mass% and is 0.5 mass% or less, and the content of the second element is 0.01 mass% or less.
  2. In Article 1, The above La-Mo - based composite oxide is a ceramic material comprising La₂Mo₂O₅ .
  3. The ceramic material described in claim 1 or 2 is in powder form, and A compact formed by compression molding the above-mentioned powdered ceramic material.
  4. A sintered body formed by sintering the ceramic material described in claim 1 or 2.
  5. An article having the ceramic material described in claim 1 or 2 on at least a portion of its surface.
  6. An article formed by dispersing the ceramic material described in claim 1 or 2 within the material.
  7. delete

Description

Ceramic materials, compacts, sintered bodies, and articles The present invention relates to ceramic materials, compacted bodies, sintered bodies, and articles. As shown in Patent Document 1, ceramics composed of a composite oxide containing rare earth elements and molybdenum (Mo) are known as a new type of inorganic material having antibacterial and antiviral properties. Among such ceramics, those composed of a composite oxide containing lanthanum (La) as a rare earth element (e.g., La₂Mo₂O₅ ) are receiving particular attention for reasons such as being advantageous for industrial production because they use lanthanum, which is inexpensive and readily available among rare earth elements. Figure 1 is a graph showing the results of the antibacterial performance evaluation test of Example 3. Figure 2 is a graph showing the results of the antiviral performance evaluation test of Example 3. Figure 3 is a graph showing the results of the antibacterial performance evaluation test of Example 4. Figure 4 is a graph showing the results of the antiviral performance evaluation test of Example 4. The ceramic material of the present embodiment comprises a La-Mo-based composite oxide and at least one first element selected from the group consisting of Si and Al, and contains the first element in a predetermined ratio. La-Mo composite oxides are the main components of ceramic materials and are mainly composed of composite oxides of lanthanum (La) and molybdenum (Mo ) . There are no particular limitations on such La - Mo composite oxides as long as they do not impede the purpose of the present invention, but examples include La₂Mo₂O₅ , La₂Mo₃O₁₂ , La₆MoO₁₂ , La₇Mo₇O₃₀ , La₂Mo₄O₁₅ , La₂MoO₆ , La₄MoO₅ , and LaMo₂O₅ . These La - Mo composite oxides may be used alone or in combination of two or more types. As for the La-Mo-based composite oxide, at least one selected from the group consisting of La₂Mo₂O₅, La₂Mo₄O₁₅, and La₂MoO₆ispreferred,morepreferablyincludes at least La₂Mo₂O₅ , and particularly preferred is La₂Mo₂O₅ . In addition, the La-Mo composite oxide may be a La-Mo composite oxide (non-substitutional La-Mo composite oxide) containing only lanthanum (La) and molybdenum (Mo) as metal elements, or a La-Mo composite oxide (partially substitutional La-Mo composite oxide) in which some of the lanthanum (La) is substituted with other metal elements such as Ce, W, V, for example, La 1.8 Ce 0.2 Mo 2 O 9 . The main component, the La-Mo-based composite oxide, is included in the ceramic material at least 99.0 mass%, preferably 99.3 mass% or more, and more preferably 99.5 mass% or more. Ceramic materials contain trace elements in addition to La-Mo-based composite oxides. Trace elements in ceramic materials are detected using a fluorescence X-ray spectroscopy (XRF) or an ICP emission spectroscopy (ICP) analyzer, as described below. As trace elements, for example, a first element consisting of at least one selected from the group consisting of Si and Al can be cited. The first element is included as an essential component in the ceramic material, and the content (content ratio) of the first element in the ceramic material is greater than 0 mass% and less than or equal to 0.5 mass%. It is presumed that if the content (content ratio) of the first element in the ceramic material is within this range, the phase separation between the La - Mo-based composite oxide (e.g., La₂Mo₂O₅ ) and the lanthanum aluminate is suppressed, thereby obtaining excellent antibacterial and antiviral properties, and also accelerating the time to exhibit antibacterial and antiviral properties. Furthermore, since lanthanum aluminate does not contribute to antibacterial and antiviral properties, if it separates from the La-Mo-based composite oxide, it causes a decrease in the antibacterial and antiviral properties of the ceramic material. If the first element is excessively abundant (in other words, if the content (content ratio) of the first element exceeds 0.5 mass%), the La-Mo complex oxide and lanthanum aluminate separate into phases, which causes a decrease in antibacterial and antiviral properties. In addition, among the ceramic materials, it is preferable that the first element be included in an amount of 0.0001 mass% or more, more preferable that it be included in an amount greater than 0.0003 mass%, more preferable that it be included in an amount of 0.01 mass% or more, and more preferable that it be included in an amount of 0.02 mass% or more. Also, the first element may be included in an amount of 0.1 mass% or less, or 0.05 mass% or less. The detection of the first element in the ceramic material is first carried out using XRF, as described below. If the first element can be detected by XRF, the content (content ratio) of the first element in the ceramic material is determined based on the detection result. In addition, if the first element in the ceramic material cannot be detected by XRF, the detection of the first element is carried out on the ceram