Joined body, honeycomb structure, method for producing joined body, and covered body

Patent metadata

Field	Value
Publication number	US-10242763-B2
Application number	US-201615058654-A
Country	US
Kind code	B2
Filing date	Mar 2, 2016
Priority date	Mar 20, 2015
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A joined body 20 includes a first member 22 having a thermal expansion coefficient of 8 ppm/K or less, a second member 24 having a thermal expansion coefficient of 12 ppm/K or more, and a joining portion 30 composed of an electrically conductive oxide containing 50% by mass or more of a spinel-type ferrite phase, the joining portion 30 joining the first member and the second member. The electrically conductive oxide preferably contains Fe and element A (where element A represents one or more selected from the group consisting of Mg, Mn, Co, Ni, Cu, and Zn). The molar ratio of element A to Fe, i.e., A/Fe, is 0.5 or less.

First claim

What is claimed is:

1. A joined body comprising:
a first member having a thermal expansion coefficient of 8 ppm/K or less;
a second member having a thermal expansion coefficient of 12 ppm/K or more; and
a joining portion composed of an electrically conductive oxide containing 50% by mass or more of a spinel ferrite phase, the joining portion joining the first member and the second member,
wherein the electrically conductive oxide contains Fe and element A, and element A resents one or more elements selected from the group consisting of Mg, Mn, Co, Ni, Cu, and Zn,
wherein in the electrically conductive oxide, the molar ratio of element A to Fe, is 0.25 or more and 0.4 or less, and
wherein the joining portion has a thermal expansion coefficient of 8 ppm/K or more and 12 ppm/K or less.

2. The joined body according to claim 1 , wherein the electrically conductive oxide contains one or more spinel ferrite phases selected from the group consisting of ZnFe 2 O 4 , CuFe 2 O 4 , and MnFe 2 O 4 .

3. The joined body according to claim 1 , wherein the joining portion has an electrical conductivity of 1.0×10 −6 S/cm or more.

4. The joined body according to claim 1 , wherein the first member is composed of a ceramic containing Si, and the second member is composed of an alloy containing Fe.

5. The joined body according to claim 1 , wherein the joined body has a joining strength of 3.0 MPa or more.

6. The joined body according to claim 1 , wherein at least one of part of a surface of the first member adjacent to the joining portion is exposed and part of a surface of the joining portion adjacent to the second member is exposed.

7. A honeycomb structure comprising the joined body according to claim 1 .

8. A method for producing a joined body, comprising a step of:
firing a laminate to form a joining portion, the laminate including a first member having a thermal expansion coefficient of 8 ppm/K or less, a second member having a thermal expansion coefficient of 12 ppm/K or more, and an electrically conductive oxide raw material arranged between the first member and the second member, the joining portion being composed of an electrically conductive oxide containing 50% by mass or more of a spinel ferrite phase, and the joining portion joining the first member and the second member,
wherein the electrically conductive oxide contains Fe and element A, and element A represents one or more elements selected from the group consisting of Mg, Mn, Co, Ni, Cu, and Zn,
wherein n the electrically conductive oxide, the molar ratio of element to Fe, is 0.25 or more and 0.4 or less, and
wherein the joining portion has a thermal expansion coefficient of 8 ppm/K or more and 12 ppm/K or less.

9. The method for producing a joined body according to claim 8 , wherein the electrically conductive oxide raw material contains a metal powder and a compound powder.

10. The method for producing a joined body according to claim 9 , wherein the compound powder is one or more selected from the group consisting of oxide powders, carbonate powders, hydroxide powders, and chloride powders.

Assignees

• Ngk Insulators Ltd

Inventors

• Izumi Yunie
• Kobayashi Yoshimasa

Classifications

• C04B2235/763

  Spinel structure AB2O4 · CPC title

• C04B38/0016

  assembled from subunits · CPC title

• B32B2264/105

  Metal · CPC title

• B32B9/005

  comprising one layer of ceramic material, e.g. porcelain, ceramic tile (layered products with at least two ceramic layers composed mainly of ceramic B32B18/00) · CPC title

• C04B2235/9607

  Thermal properties, e.g. thermal expansion coefficient · CPC title