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CN-122010578-A - Ceramic continuous fiber having metal element and ceramic matrix composite material using same

CN122010578ACN 122010578 ACN122010578 ACN 122010578ACN-122010578-A

Abstract

The present application relates to a ceramic continuous fiber having a metal element and a ceramic matrix composite using the same. The purpose of the present application is to provide a ceramic continuous fiber having a metal element, which is suitable for producing a CMC having high heat resistance, and a CMC using the same. The ceramic continuous fiber is characterized in that the ceramic continuous fiber has a metal element, and the metal element has a mass concentration of 10ppm to 1000 ppm.

Inventors

  • KODA YUJI
  • Shan Xiaxun
  • Ping Gaoyao
  • OHTA Ikuya

Assignees

  • 东曹株式会社

Dates

Publication Date
20260512
Application Date
20210927
Priority Date
20200929

Claims (14)

  1. 1. A ceramic continuous fiber, characterized in that a metal element is present in the ceramic continuous fiber, the metal element having a mass concentration of 10ppm to 1000ppm, and the metal element being present at grain boundaries of ceramics constituting the ceramic continuous fiber.
  2. 2. The ceramic continuous fiber according to claim 1, wherein the metal element is a metal element other than iron and aluminum.
  3. 3. The ceramic continuous fiber according to claim 1 or 2, wherein the metal element is 1 or more selected from the group consisting of sodium, potassium, magnesium, calcium, strontium, barium, lanthanum, cerium, praseodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, yttrium, zirconium, neodymium, titanium, scandium, vanadium, chromium, manganese, cobalt, nickel, and copper.
  4. 4. A ceramic continuous fiber according to any one of claims 1 to 3, wherein the metal element is one or more selected from the group consisting of lanthanum, ytterbium, lutetium, magnesium, cerium, zirconium, neodymium, titanium, calcium, yttrium, and strontium.
  5. 5. The ceramic continuous fiber according to any one of claims 1 to 4, wherein the metal element is in at least one of a grain boundary diffusion and a substitution solid solution state.
  6. 6. The ceramic continuous fiber according to any one of claims 1 to 5, wherein the ceramic continuous fiber is a continuous fiber comprising at least alumina.
  7. 7. The ceramic continuous fiber according to any one of claims 1 to 6, wherein a crystallite growth rate calculated from the following formula (1) after heat treatment under conditions of an atmospheric atmosphere at 1300 ℃ for 100 hours is 160% or less, G = {(d b -d a ）/d a }×100 ···(1) G is a growth rate (%), d a is a crystallite diameter (nm) of a substance constituting the fiber in the ceramic continuous fiber before heat treatment, and d b is a crystallite diameter (nm) of a substance constituting the fiber in the ceramic continuous fiber after heat treatment.
  8. 8. The ceramic continuous fiber according to any one of claims 1 to 7, wherein the ceramic continuous fiber is an alumina continuous fiber or a mullite continuous fiber.
  9. 9. Ceramic matrix composite, characterized in that a ceramic continuous fiber according to any one of claims 1 to 8 is used.
  10. 10. The ceramic matrix composite according to claim 9, wherein the ceramic matrix constituting the ceramic matrix composite is at least any one selected from the group consisting of alumina, mullite, zirconia and silica.
  11. 11. The ceramic matrix composite according to claim 9 or 10, wherein a difference in bulk tensile strength between before and after the heat treatment at 1300 ℃ in an atmospheric atmosphere for 100 hours is 100MPa or less.
  12. 12. The method for producing a ceramic continuous fiber according to any one of claims 1 to 8, comprising a step of immersing the ceramic continuous fiber in a solution containing a metal acetylacetonate complex, and a step of heat-treating at 950 ℃ or higher and 1300 ℃ or lower.
  13. 13. The method for producing ceramic continuous fiber according to claim 12, wherein the metal acetylacetonate complex is an acetylacetonate complex containing 1 or more selected from the group consisting of lanthanum, ytterbium, lutetium, magnesium, zirconium, cerium, yttrium, titanium, sodium, potassium, calcium, scandium, vanadium, chromium, manganese, cobalt, nickel, copper, zinc, gallium, and strontium.
  14. 14. A method for producing a ceramic matrix composite, comprising compounding the ceramic continuous fiber according to any one of claims 1 to 8 with a ceramic matrix.

Description

Ceramic continuous fiber having metal element and ceramic matrix composite material using same The present application is a divisional application of chinese patent application No.202180066130.3 (PCT application No. PCT/JP 2021/035351) with the title of "ceramic continuous fiber with metal element and ceramic matrix composite material using the same" on the application day of 2021, 9, 27. Technical Field The present invention relates to a ceramic continuous fiber having a metal element and a ceramic matrix composite using the same. Background A ceramic matrix composite material (hereinafter also referred to as "CMC") obtained by compositing ceramic continuous fibers and a ceramic matrix has a damage resistance (damage resistance) that is not typical of ceramics. Accordingly, CMC is being studied as a substitute material for a heat-resistant metal such as a Ni-based alloy. In particular, oxide CMC formed using alumina or mullite oxide is known to have high chemical stability against environmental substances such as oxygen, water vapor, ca, mg, na, si and the like. In addition, CMC obtained by using ceramic continuous fibers made of alumina or mullite-based oxide is particularly expected to be used as a member for jet engines for aviation (for example, non-patent document 1). The limit use temperature of the oxide CMC is 1100 ℃ or lower, and is lower than that of non-oxide CMC (limit use temperature: 1500 ℃) formed by silicon carbide. As one of the reasons for this, oxide-based fibers have lower heat resistance than silicon carbide fibers. The heat resistance temperature of CMC such as the ultimate use temperature depends on the heat resistance of the fiber, and thus attempts have been made to improve the heat resistance of the fiber (for example, non-patent documents 2 to 4). Prior art literature Non-patent literature Non-patent document 1 J.AerospaceLab, issue3, (2011) 1-12. Non-patent document 2 J.Am.Ceram.Soc.99, issue99, (2016) 1709-1716. Non-patent document 3 J.composites: partA, issue32, (2001) 1143-1153. Non-patent document 4 J.RareEareth, issue2, (2012) 175. Disclosure of Invention Problems to be solved by the invention In non-patent document 3, zirconia and yttria are added in the production process of alumina fibers for the purpose of suppressing grain growth of alumina particles in the fibers and improving creep characteristics. However, such alumina fibers do not have heat resistance and creep characteristics as high as those of commercially available mullite fibers (Nextel 720). In non-patent document 4, lanthanum oxide is mixed with a mullite precursor to inhibit the growth of mullite hot particles in mullite fibers. The mullite fiber thus obtained has a heat-resistant temperature of about 1000 ℃. As a method for producing a usual ceramic continuous fiber, a method of mixing a plurality of precursor solutions containing elements constituting the fiber, adjusting viscosity, spinning, and firing is mentioned. In non-patent documents 3 and 4, a trace amount of additive is added to a precursor solution containing a fiber constituent element. However, it is difficult to uniformly disperse the trace amount of additive in the precursor solution, and the trace amount of additive is coagulated. Therefore, the additive cannot exert its effect. In addition, the production of fibers containing additives requires complicated steps. On the other hand, as a method of adding an element to a ceramic material, there is generally an ion implantation method of implanting ionized atoms or molecules into a material. However, the ion implantation method requires a large-scale apparatus. In addition, in the ion implantation method, it is difficult to uniformly add elements to ceramic continuous fibers having a columnar shape. The purpose of the present invention is to provide a ceramic continuous fiber which has high heat resistance and contains a metal element and is suitable for producing a CMC having high strength, and a CMC using the same. Means for solving the problems The present inventors have conducted intensive studies to solve the above-described problems. As a result, it has been found that the ceramic continuous fiber containing a small amount of a specific metal element in the fiber can solve the above-mentioned problems. Thus, the present application has been completed. That is, the present invention is as recited in the claims. The gist of the present disclosure is a ceramic continuous fiber containing a metal element uniformly in the ceramic continuous fiber, and a Ceramic Matrix Composite (CMC) using the same, particularly a ceramic continuous fiber shown below, a CMC using the same, and a method for producing the same. [1] The ceramic continuous fiber is characterized in that the ceramic continuous fiber has a metal element, and the metal element has a mass concentration of 10ppm to 1000 ppm. [2] The ceramic continuous fiber according to the above [1], wherein the metal element is a metal element oth