JP2017052673A - Bonded body manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bonded body manufacturing method capable of improving operating efficiency.SOLUTION: A bonded body manufacturing method includes: preparing a mixture 10 in which a carbon adhesive 5 and a Si-Ti alloy powder 6 are mixed; placing the mixture 10 between bonding surfaces 2a, 3a of a pair of ceramic matrix composites (CMC) 2, 3 to be bonded; and after hardening the carbon adhesive 5 in the mixture 10 to bond the CMC 2, 3 to each other, reacting a carbon (C) component of the carbon adhesive 5 with a silicon (Si) powder and a titanium (Ti) powder by performing vacuum heat treatment to produce silicon carbide (SiC) and titanium carbide (TiC) to bond the CMC 2, 3 to each other.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a joined body manufacturing method for manufacturing a joined body in which a plurality of ceramic matrix composite members are joined.

  Various methods have been developed for joining a plurality of ceramic matrix composites (hereinafter referred to as CMC).

  For example, in Patent Document 1, an adhesive containing silicon carbide (SiC) powder and carbon (C) powder is disposed between CMCs, the adhesive is cured, and then a heat treatment is performed to obtain a cured product. Is carbonized to make it porous. The porous body is impregnated with molten silicon (Si), and a carbon (C) component and a part of silicon (Si) are reacted to generate a silicon carbide-silicon composite between the CMCs.

  That is, in Patent Document 1, when a silicon carbide-silicon composite is produced, molten silicon (Si) is added to a porous body having first silicon carbide (SiC) particles and carbon (C) contained in an adhesive. ) And reacting carbon (C) in the porous body with molten silicon (Si) to produce second silicon carbide (SiC) particles, and a part of the molten silicon (Si) as a silicon phase It remains.

JP 2014-15392

  However, in the above-mentioned Patent Document 1, after the adhesive is cured, a heat treatment at 400 ° C. to 1300 ° C. is performed in order to make the cured product of the adhesive porous, and after that, also at the time of impregnation with molten silicon, 1400 ° C. Although heating at ˜1500 ° C. is required and heat treatment needs to be performed at least twice, further efficiency is desired in the manufacture of the joined body.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a joined body manufacturing method capable of further improving working efficiency.

  In order to achieve the above-described object, a joined body manufacturing method according to a first aspect of the present invention is a joined body manufacturing method for manufacturing a joined body in which a plurality of ceramic matrix composite members are joined. Generating a mixture, and placing the mixture between the bonding surface of one ceramic matrix composite member to be bonded and the bonding surface of the other ceramic matrix composite member; and in the mixture A step of curing the carbon adhesive and bonding the one and the other ceramic-based composite members through the mixture; and the one and the other ceramic-based composite members bonded through the mixture, the Si-based alloy Heating above the melting point of.

  In the joined body manufacturing method according to a second aspect of the present invention, in the first aspect, the Si-based alloy is a Si-Ti alloy, and in the heating step, heating is performed to a temperature equal to or higher than a melting point of the Si-Ti alloy. The C component of the carbon adhesive and the Si component and Ti component of the Si-Ti alloy are reacted to form SiC and TiC.

  According to the present invention using the above means, a mixture of carbon adhesive and Si-based alloy is placed between the CMCs, the carbon adhesive is cured, the CMC is bonded, and then the heat treatment is performed. The body can be manufactured. Thereby, work efficiency can be improved more in manufacture of the joined body of CMC.

It is a side view which shows an example of the conjugate | zygote manufactured by the conjugate | zygote manufacturing method which concerns on this invention. It is explanatory drawing which shows the (a) mixture production | generation process in the conjugate | zygote manufacturing method which concerns on this invention, (b) Explanatory drawing which shows the arrangement | positioning and drying process of a mixture, (c) It is explanatory drawing which shows a heat treatment process.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A bonded body 1 shown in FIG. 1 is bonded to a pair of ceramic matrix composite members (hereinafter referred to as CMC) 2 and 3 with an intermediate material 4 interposed therebetween.

The pair of CMCs 2 and 3 are test bodies each having a columnar shape or a prismatic shape, and are arranged coaxially and joined. Each of the CMCs 2 and 3 includes a ceramic fiber and a ceramic matrix. For example, as ceramic fibers, a two-dimensional fabric in which a predetermined fiber bundle made of carbon (C) fiber, silicon carbide (SiC) fiber or the like is oriented in the axial direction and the circumferential direction, a braided fabric, or a fiber bundle is orthogonal to each other. A three-dimensional fabric oriented in three axial directions is used. The ceramic matrix is made of carbon (C), silicon carbide (SiC), silicon nitride (Si ₃ N ₄ ), or the like, and is attached to ceramic fibers. Among such CMCs, in particular, both ceramic fibers and ceramic matrix are made of carbon (C) or silicon carbide (SiC), ceramic fibers are made of carbon (C), and the ceramic matrix is silicon carbide ( It is preferable to use a material made of SiC).

  The intermediate material 4 is obtained by reacting the C component of the carbon adhesive with the Si component in the Si—Ti alloy to form SiC. Further, since the Ti component in the Si—Ti alloy also reacts with the C component of the carbon adhesive, the intermediate material 4 contains TiC (titanium carbide). Further, the outer periphery of the intermediate material 4 is processed so as to be flush with both the CMCs 2 and 3.

  The joined body 1 of the present embodiment is a test body having a columnar shape or a prismatic shape, but actually requires a sufficient strength at a high temperature of 1000 ° C. or more such as a turbine blade of an aircraft engine. Used as a structure.

  Hereinafter, an example of a specific manufacturing method of the joined body according to the present invention will be described with reference to FIG.

  First, as shown in FIG. 2A, a mixture 10 in which a carbon adhesive 5 and a Si—Ti alloy powder 6 are mixed is prepared. The mixture 10 is in the form of a paste, and a solvent 7 may be added to adjust the handleability of the paste. As the solvent 7, for example, ethanol is preferable.

  Next, as shown in FIG. 2 (b), the mixture 10 is disposed between the joint surfaces 2 a and 3 a of the pair of CMCs 2 and 3. Specifically, the mixture 10 is applied to one joint surface 2a, and the other joint surface 3a is connected to one joint surface 2a via the mixture 10 so that the distance between the joint surfaces 2a and 3a becomes a predetermined value. Press to the side. At this time, the mixture 10 can be brought into contact over the entire area of both the joint surfaces 2a and 3a by applying to the one joint surface 2a such an amount that the mixture 10 protrudes outside the outer periphery of both the CMCs 2 and 3. Moreover, since the mixture 10 is paste-like, it is difficult to leak out or impregnate.

  Then, drying is performed to cure the carbon adhesive 5 in the mixture 10. Drying temperature conditions and time follow the conditions set for the carbon adhesive 5 in the mixture 10. In addition, when the solvent 7 is added, the solvent 7 evaporates at the time of drying and is removed from the mixture 10. When the carbon adhesive 5 in the mixture 10 is cured, the CMCs 2 and 3 are bonded together with the distance between the joint surfaces 2a and 3a fixed.

  Subsequently, as shown in FIG. 2C, so-called vacuum heat treatment is performed in which the CMCs 2 and 3 bonded via the mixture 10 are placed in the vacuum furnace 20 and heated in a reduced pressure state. Here, by heating to a temperature equal to or higher than the melting point of the Si—Ti alloy, the carbon (C) component of the carbon adhesive 5 in the mixture 10 and the Si—Ti alloy powder 6 react to form silicon carbide (SiC). ) And titanium carbide (TiC) are produced and the CMCs 2 and 3 are joined. In this way, the mixture 10 is converted into silicon carbide (SiC) and titanium carbide (TiC) to form the intermediate material 4. Then, after the heat treatment, final outer shape processing is performed on the joined body of CMCs 2 and 3 taken out from the vacuum furnace 20. For example, in the case of the joined body 1 shown in FIG. 1, the outer periphery of the intermediate material 4 is made flush with both the CMCs 2 and 3 by this final outer shape processing.

  Next, the strength test of the joined body formed by joining the CMCs by the above manufacturing method was performed.

  Specifically, a carbon adhesive, a Si—Ti alloy powder, and an ethanol solvent were mixed at a ratio of carbon adhesive: Si—Ti alloy powder: ethanol solvent = 2: 2: 1 to form a mixture. In addition, Si-Ti alloy powder was made into the ratio of Si-16at% Ti. And after drying CMC which has arrange | positioned a mixture between joining surfaces in 129 degreeC environment for 4 hours, it was further dried in 260 degreeC environment for 2 hours. Then, the CMC bonded by the mixture was heat-treated for 20 minutes at a temperature within + 50 ° C. from the melting point of Si-16 at% Ti in a vacuum furnace.

  As a result of conducting a strength test on the joined body manufactured under the above conditions, a strength of about 25 MPa could be obtained.

  As described above, in the present embodiment, a mixture obtained by mixing a carbon adhesive with Si—Ti alloy powder is disposed between CMCs, the carbon adhesive is cured, and the CMC is bonded, and then a single heat treatment is performed. It is possible to produce a CMC bonded body with sufficient strength. Although the melting point of Si alone is usually 1400 ° C. or higher, the melting point can be lowered by using Si—Ti alloy powder, and the heat treatment temperature in a vacuum furnace can also be lowered.

  For this reason, according to the method for manufacturing a CMC assembly of the present embodiment, a CMC assembly can be manufactured more efficiently. And the joined body of CMC manufactured by the said manufacturing method can have sufficient intensity | strength.

  Although the description about the embodiment of the joined body manufacturing method according to the present invention is finished as above, the embodiment is not limited to the above embodiment.

  The mixture 10 of the above embodiment is a mixture of the carbon adhesive 5 and the Si—Ti alloy powder 6, but the powder mixed with the carbon adhesive may be a Si-based alloy powder having a melting point lower than the melting point of Si alone. What is necessary is just Si-Hf (hafnium) alloy powder and Si-Y (yttrium) alloy powder besides Si-Ti alloy powder. The Si-based alloy is preferable because its powder form is excellent in handleability. For example, a paste of Si alloy powder having a viscosity that does not flow out when applied may be mixed with the carbon adhesive.

DESCRIPTION OF SYMBOLS 1 Bonding body 2, 3 Ceramics base composite member 2a, 3a Bonding surface 4 Intermediate material 5 Carbon adhesive 6 Si-Ti alloy powder 7 Solvent 10 Mixture 20 Vacuum furnace

Claims (2)

A joined body manufacturing method for manufacturing a joined body obtained by joining a plurality of ceramic matrix composite members,
Generating a mixture of a carbon adhesive and a Si-based alloy;
Disposing the mixture between the bonding surface of one ceramic matrix composite member to be bonded and the bonding surface of the other ceramic matrix composite member;
Curing the carbon adhesive in the mixture and bonding the one and other ceramic matrix composite members through the mixture; and
Heating the one and other ceramic matrix composite members bonded through the mixture to a melting point or higher of the Si-based alloy;
A method for manufacturing a joined body.   The Si-based alloy is a Si-Ti alloy, and in the heating step, the Si-Ti alloy is heated to a temperature equal to or higher than the melting point of the Si-Ti alloy, and the C component of the carbon adhesive and the Si component and Ti component of the Si-Ti alloy. The bonded body manufacturing method according to claim 1, wherein the reaction is made into SiC and TiC.

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