JP4766645B2 - Damping member - Google Patents

Description

The present invention relates to a vibration damping member.

  Conventionally, a damping member made of a material composed only of an elastic body of rubber or synthetic resin, or a material in which a rigid body is dispersed inside the elastic body as a matrix is known. In this damping member, the elastic body has a large internal friction and easily absorbs vibration energy, prevents the vibration of parts and members from being transmitted to the outside, and transmits external vibration to the parts and the like. Can be prevented. For this reason, this damping member is widely used in various industrial fields such as machines and buildings.

  However, since the conventional damping member is mainly composed of an elastic body, the rigidity is low, and it deforms greatly only by applying a small force. For this reason, the vibration damping member is difficult to be employed for structural parts that require high accuracy, such as sample holders for electron microscopes and scanning tunneling microscopes, precision processing machines, and the like. In addition, if a damping member such as a damping steel plate that exhibits damping properties by laminating or sandwiching an elastic body of rubber or synthetic resin on a plate-like metal, these are shaped like plates. It will be limited.

  In this regard, it is conceivable to use the ceramic product disclosed in Patent Document 1 as a damping member. Such a damping member is made of a porous ceramic material and a resin such as a thermosetting acrylic resin impregnated in the ceramic material. In this ceramic product, while the ceramic material itself exhibits high rigidity, the resin impregnated in the ceramic material is considered to absorb vibration energy between the individual particles of the ceramic material. Compared to the vibration member, it has high rigidity and is considered to be difficult to deform by a small force.

JP 2001-106584 A

  However, it is difficult to apply the above-described conventional vibration damping member to structural parts that require higher accuracy and structural parts such as machines that require high resolution. For this reason, a damping member that can be applied to a structural member that requires higher accuracy is required in the market.

The present invention has been made in view of the above conventional circumstances, to provide a highly by rigidity and high damping property, which can be employed as a structural part which requires high accuracy damping member Is a problem to be solved.

The inventors conducted intensive research to solve the above-mentioned problems , and when using aluminum titanate-based plastic ceramics having a specific composition and having microcracks at grain boundaries and intertwined columnar crystals , The present inventors have found that the problem can be solved and have completed the present invention.

That is, in the vibration damping member of the present invention, the total amount of Al ₂ O ₃ , TiO ₂ and MgO is 100% by mass, the Al ₂ O ₃ is 59% by mass or less, and the TiO ₂ is 38% by mass or more. and the remainder consists of a plastic ceramic aluminum titanate-based capable plastically deformed columnar crystals are entangled with each other with a micro-crack in the MgO der is, and the grain boundary, the resin impregnated into該塑ceramics, The internal friction is 0.0104 to 0.0427, and the Young's modulus is 53.5 to 124.2 (GPa).

In the vibration damping member of the present invention, aluminum titanate (Al ₂ TiO ₅ ) -based plastic ceramics have microcracks at the grain boundaries and the columnar crystals are entangled with each other, showing a high strain and allowing large plastic deformation I have to. If this plastic ceramic is impregnated with a resin, the resin penetrates into the microcracks, and the resin restrains the movement of the crystal of the plastic ceramic and exhibits high rigidity, while the resin penetrated between the columnar crystals absorbs vibration energy. Absorb. As a result, the vibration damping member of the present invention has both high rigidity and high vibration damping properties. At this time, in this damping member, the plastic ceramic material itself has high rigidity, and the coupling of the columnar crystals is difficult to be separated by the vibration of the resin itself, so that it can be applied to a structural component that requires high accuracy.

  Therefore, the vibration damping member of the present invention can be employed as a structural component that requires high accuracy due to high rigidity and high vibration damping properties.

  Further, the vibration damping member of the present invention uses plastic ceramics in which many microcracks are generated. For this reason, when processing, such as cutting, is given to the damping member, microcracks prevent cracks generated by the processing. Thus, the vibration damping member can exhibit machinability and can be post-processed, so that the shape restriction is reduced. For this reason, if the damping member is used, it can be expected to manufacture a part with high dimensional accuracy.

According to the inventors the test results, plastic ceramics, ing in raw material consisting essentially of Al ₂ O _3, TiO ₂ and alkaline earth oxide is calcined. Al ₂ O ₃ and TiO ₂ constitute a crystal of aluminum titanate (Al ₂ TiO ₅ ), and an alkaline earth oxide constitutes another crystal together with Al ₂ O ₃ and / or TiO ₂ . In these plastic ceramics, these crystals form solid crystals to form columnar crystals, each of which has microcracks at the grain boundaries, and the columnar crystals are entangled with each other, and the strain is reliably displayed at a high value, enabling large plastic deformation. I have to. Thus, in this plastic ceramic, internal friction increases due to large strain caused by microcracks. For this reason, it is considered that the vibration damping member of the present invention can have more excellent vibration damping properties.

“Substantially” means that the raw material may contain inevitable SiO ₂ , Fe ₂ O _{3 and the} like in addition to Al ₂ O ₃ , TiO ₂ and alkaline earth oxides.

As a raw material containing Al ₂ O ₃ , Al ₂ O ₃ , Al (OH) ₃ or the like can be employed. As a raw material containing TiO ₂ , TiO ₂ or the like can be adopted. According to the inventors' consideration, it is considered that MgO, CaO, BaO or the like can be used as the alkaline earth oxide. As a raw material containing MgO, MgCO ₃ , Mg (OH) ₂ or the like can be employed. As a raw material containing CaO, CaCO ₃ . Ca (OH) ₂ or the like can be employed. As a raw material containing BaO, BaCO ₃ , Ba (OH) ₂ or the like can be employed. According to the test results of the inventors, when MgO is employed as an alkaline earth oxide, a crystal of magnesium titanate (MgTi ₂ O ₅ ) is also formed, and the plastic ceramic exhibits a high value of strain. For this reason, the internal friction of the damping member can be increased.

According to the test results of the inventors, when MgO is employed as an alkaline earth oxide, the total of Al ₂ O ₃ , TiO ₂ and MgO is 100% by mass, and Al ₂ O ₃ is 59% by mass or less. , and the TiO ₂ is 38 mass% or more, Ru rest MgO der. In particular, MgO is preferably 21% by mass or less. This is because the vibration damping member thus obtained has sufficient vibration damping properties.

  Examples of the resin include thermosetting resins such as thermosetting acrylic resins, phenol resins, epoxy resins, urea resins, melamine resins, polyamides, polyacetals, polycarbonates, polyethylene terephthalates, polyvinyl chloride, polystyrene, thermoplastic acrylic resins, etc. A thermoplastic resin can be employed. According to the test results of the inventors, it is preferable to employ a thermosetting resin. Since the thermosetting resin has a three-dimensional network structure, it is superior in heat resistance and mechanical strength compared to thermoplastic resin, and can be a vibration damping member excellent in heat resistance and mechanical strength. It is. In particular, according to the test results of the inventors, it is preferable to employ a thermosetting acrylic resin as the thermosetting resin. If it is a thermosetting acrylic resin, it will become a damping member which has high rigidity reliably. A plurality of types of thermosetting acrylic resins can also be mixed and used.

  The resin is selected in the side chain depending on the required damping performance. This is because the flexibility of the resin varies depending on the side chain, and the side chain of the resin is considered to have a deep relationship with the internal friction. For example, the thermosetting acrylic resin can be selected from various ester groups such as a methyl ester group, an ethylhexyl ester group, and a lauryl ester group.

  According to the test results of the inventors, when the thermosetting resin is methyl methacrylate, S-lauryl methacrylate, 2-ethylhexyl methacrylate or the like, the frequency dependency of internal friction is low, A damping member that does not select a frequency is obtained.

The vibration damping member of the present invention can be manufactured by the method for manufacturing a vibration damping member of the present invention. This manufacturing method includes a blending step for obtaining a blend from raw materials substantially consisting of Al ₂ O ₃ , TiO ₂ and an alkaline earth oxide, a molding step for molding the blend into a compact, and the molding The method includes a firing step of firing a body to obtain a plastic ceramic, and an impregnation step of impregnating the plastic ceramic with a resin to obtain a damping member.

In the method for manufacturing a vibration damping member of the present invention, a preparation is obtained from a raw material substantially consisting of Al ₂ O ₃ , TiO ₂ and an alkaline earth oxide by a preparation step, and the preparation is formed into a molded body by a forming step, and then fired. The molded body is fired by the process to obtain a plastic ceramic. Then, the vibration damping member is obtained by impregnating the plastic ceramic with the resin in the impregnation step.

  In the vibration damping member manufacturing method of the present invention, it is preferable to perform the firing step at 1400 to 1550 ° C. When the firing step is less than 1400 ° C., the Young's modulus of the damping member can be maintained high, but the internal friction of the damping member is not sufficient because the growth of columnar crystals of plastic ceramic is not sufficient and distortion is small. On the other hand, if the firing temperature exceeds 1550 ° C, the bending strength is lowered, which is not preferable.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings. In the embodiment, Test Examples 1 to 6 shown below are performed.
(Test Example 1)

In the manufacturing method of the vibration damping member of Test Example 1, in the blending step S10 shown in FIG. 1, the raw materials composed of Al ₂ O ₃ , TiO ₂ and alkaline earth oxide are mixed so as to have the mass% shown in Table 1. . MgO is used as the alkaline earth oxide. Here, MgO is fixed to 3.0 parts by mass, Al ₂ O ₃ is changed from 30.0 to 90.0 parts by mass, and TiO ₂ is changed from 70.0 to 10.0 parts by mass. That is, when Al ₂ O ₃ , TiO ₂ and MgO are 100% by mass in total, MgO is fixed at 2.91% by mass, Al ₂ O ₃ is 29.13 to 87.38% by mass and TiO ₂ is It will change at 9.71-67.96 mass%. Each mixture is wet pulverized with a ball mill for 1 hour, the pulverized product is dried at 120 ° C., and the dried product is passed through a sieve having an opening of 0.5 mm to prepare a formulation.

Next, in the molding step S20, each preparation is dry press molded at a pressure of 500 kgf / cm ² to obtain a molded body.

  Next, in the firing step S30, each molded body is put in an electric furnace and fired at 1500 (° C) for 2 hours. Thus, sample No. C1-C6 plastic ceramics are obtained. The size of each plastic ceramic is 10 (mm) × 64 (mm) × 5 (mm).

  Sample No. obtained in this way. Table 1 also shows the open porosity (%) of C1 to C6 plastic ceramics. In addition, each sample No. The bending strength (MPa) in C1-C6 plastic ceramics is measured using an autograph. At that time, a three-point bending test is performed with an autograph measurement span of 40 (mm) and a crosshead speed of 0.5 (mm / min). When performing the three-point bending test, each sample No. Strain (%), internal friction and Young's modulus (GPa) generated until the C1 to C6 plastic ceramics are broken are measured. The results are also shown in Table 1.

  In the impregnation step S40, each sample No. A C1-C6 plastic ceramic is impregnated with a thermosetting acrylic resin as a thermosetting resin. As the thermosetting acrylic resin, methyl methacrylate (MMA) is used. At this time, a vacuum desiccator is used. The vacuum desiccator is provided with a tube that communicates the inside and the outside, and a bi-directional cock is provided in the middle of the tube on the outside side. In this vacuum desiccator, each sample No. C1-C6 plastic ceramics are put in and deaerated for 10 minutes at a vacuum degree of 1.33 KPa with a vacuum pump. After immersing the outer end of the tube in methyl methacrylate, the bi-directional cock is opened and the inside and outside of the vacuum desiccator are communicated. Thus, methyl methacrylate was introduced from the outside into the vacuum desiccator. A C1-C6 plastic ceramic is impregnated with thermosetting methyl methacrylate. Then, after closing the bi-directional cock and performing deaeration for 10 minutes, it returns to atmospheric pressure and leaves still for 5 minutes. During this period, methyl methacrylate was removed from each sample No. by atmospheric pressure. Impregnation into C1-C6 plastic ceramics. Thus, each sample No. shown in Table 2 was obtained. The damping member of 1-6 is obtained.

  Each sample No. The bending strength (MPa), strain (%), internal friction and Young's modulus (GPa) of the vibration damping members 1 to 6 are measured in the same manner as described above. The results are also shown in Table 2.

  From Table 1 and Table 2, each sample No. The vibration damping members 1 to 6 are the sample Nos. Compared with C1-C6 plastic ceramics, the strain is generally small. Further, the bending strength is generally increased. Furthermore, there is no significant change in internal friction, and the Young's modulus is increased.

In particular, in order for the vibration damping member to have sufficient vibration damping properties, it is necessary to satisfy the requirement that the internal friction is approximately 0.01 or more. From this point, from Table 2, each sample No. In the vibration damping members 1 to 4, the internal friction is 0.0092 to 0.0175, so that the requirement is substantially satisfied. Moreover, in the damping member of each sample No. 1-6, since Young's modulus is 88.4-313.8 (GPa), it turns out that it has Young's modulus substantially equal to or more than aluminum alloy etc. .
(Test Example 2)

In the manufacturing method of the vibration damping member of Test Example 2, as in Test Example 1, the molded body is molded by performing the mixing step S10 and the molding step S20 so that the mass% shown in Table 3 is obtained. Here, MgO is fixed to 3.0 parts by mass, Al ₂ O ₃ is changed from 50.0 to 90.0 parts by mass, and TiO ₂ is changed from 50.0 to 10.0 parts by mass. That is, when Al ₂ O ₃ , TiO ₂ and MgO are 100% by mass in total, MgO is fixed at 2.91% by mass, Al ₂ O ₃ is 48.54 to 87.38% by mass and TiO ₂ is It will change at 9.71-48.54 mass%. And in baking process S30, a molded object is baked with the calcination temperature of 1400 (degreeC), each sample No.1. C7-C9 plastic ceramics are obtained.

  Each sample No. For C7 to C9 plastic ceramics, the bending strength (MPa), strain (%), internal friction and Young's modulus (GPa) are measured as in Test Example 1. The results are also shown in Table 3.

  Then, as in Test Example 1, the impregnation step S40 is performed. Thus, each sample No. Each sample No. shown in Table 4 was impregnated by impregnating a plastic ceramic of C7 to C9 with methyl methacrylate. The damping member of 7-9 is obtained.

  Each sample No. Regarding the vibration damping members 7 to 9, the bending strength (MPa), strain (%), internal friction and Young's modulus (GPa) are measured in the same manner as described above. The results are also shown in Table 4.

  From Table 3 and Table 4, each sample No. The damping members of Nos. 7 and 8 are sample Nos. The strain is smaller than C7 and C8 plastic ceramics. Moreover, internal friction is large and Young's modulus is also large. However, sample no. The damping member of No. 9 is sample No. The strain is larger than that of C9 plastic ceramics. Moreover, internal friction is small and Young's modulus is also small.

In particular, in order for the vibration damping member to have sufficient vibration damping properties, it is necessary to satisfy the requirement that the internal friction is approximately 0.01 or more. From this point, from Table 4, Sample No. The vibration damping member No. 7 satisfies the requirement because the internal friction is 0.0104. Moreover, in the damping member of each sample No. 7-9, since Young's modulus is 104.7-277.1 (GPa), it turns out that it has Young's modulus substantially equal to or more than aluminum alloy etc. .
(Test Example 3)

In the method for manufacturing a vibration damping member of Test Example 3, as in Test Example 1, the molded body is molded by performing the mixing step S10 and the molding step S20 so that the mass% shown in Table 5 is obtained. Here, 50.0 parts by mass of Al ₂ O _3, to secure the TiO ₂ to 50.0 parts by mass, and changing the MgO to 0.0 to 20.0 parts by weight. That is, when Al ₂ O ₃ , TiO ₂ and MgO are 100% by mass as a whole, Al ₂ O ₃ is 41.67 to 50.00% by mass, TiO ₂ is 41.67 to 50.00% by mass, and MgO. Will change at 0.00-16.66 mass%. In the firing step S30, the compact was fired at a firing temperature of 1500 (° C). C10-C13 plastic ceramics are obtained.

  Each sample No. obtained in this way. Table 5 also shows the open porosity (%) of C10 to C13. In addition, each sample No. Regarding C10 to C13 plastic ceramics, the bending strength (MPa), internal friction and Young's modulus (GPa) are measured in the same manner as in Test Example 1. The results are also shown in Table 5.

  Then, as in Test Example 1, the impregnation step S40 is performed. Thus, each sample No. Each sample No. shown in Table 6 was impregnated by impregnating a plastic ceramic of C10 to C13 with methyl methacrylate. 10 to 13 damping members are obtained.

  Each sample No. Regarding the vibration damping members of 10 to 13, the internal friction and Young's modulus (GPa) are measured in the same manner as described above. The results are also shown in Table 6.

  From Table 5 and Table 6, each sample No. The damping members of Nos. 10 to 13 are sample Nos. Compared with C10-13 plastic ceramics, the internal friction is increased and the Young's modulus is also increased.

In particular, in order for the vibration damping member to have sufficient vibration damping properties, it is necessary to satisfy the requirement that the internal friction is approximately 0.01 or more. From this point, from Table 6, sample No. In the vibration damping members 10 and 11, the internal friction is 0.0095 to 0.0171, so that the requirement is substantially satisfied. Moreover, in the damping member of each sample No. 10-13, since Young's modulus is 60.50-162.00 (GPa), it turns out that it has Young's modulus substantially equal to or more than aluminum alloy etc. .
(Test Example 4)

In the method for manufacturing a vibration damping member of Test Example 4, the plastic ceramic of Sample No. C12 of Test Example 3 is obtained. And in the impregnation process S40, the damping member of sample No. 14 shown in Table 7 is obtained by impregnating the plastic ceramic of sample No. C12 with S-lauryl methacrylate (SL). Moreover , the vibration damping member of sample No. 15 shown in Table 7 is obtained by impregnating the plastic ceramic of sample No. C12 with 2-ethylhexyl methacrylate (2EH). Each sample No. For the damping members 14 and 15, the internal friction and Young's modulus (GPa) are measured as in Test Example 1. The results are also shown in Table 7.

  Further, in the method for manufacturing the damping member of Test Example 4, the plastic ceramic of Sample No. C3 of Test Example 1 is obtained. And in the impregnation process S40, the damping member of sample No. 16 shown in Table 8 is obtained by impregnating the plastic ceramic of sample No. C3 with S-lauryl methacrylate. Moreover, the vibration damping member of sample No. 17 shown in Table 8 is obtained by impregnating the plastic ceramic of sample No. C3 with 2-ethylhexyl methacrylate. Each sample No. For the vibration damping members 16 and 17, the internal friction and Young's modulus (GPa) are measured as in Test Example 1. The results are also shown in Table 8.

  From Table 7 and Table 8, each sample No. The damping members of Nos. 14 to 17 are sample Nos. Although the internal friction is smaller than that of C3 and C12 plastic ceramics, the Young's modulus is larger.

According to the results of Test Examples 1 to 4, when the thermosetting resin is methyl methacrylate, S-lauryl methacrylate, 2-ethylhexyl methacrylate, or the like, the frequency dependence of internal friction is low, so vibration It is considered that a vibration damping member that does not select the frequency is obtained.
(Test Example 5)

In the method for manufacturing the vibration damping member of Test Example 5, as in Test Example 1, the molded body is molded by performing the mixing step S10 and the molding step S20 so that the mass% shown in Table 9 is obtained. Here, each sample No. It is assumed that the C14-C20 plastic ceramic is a columnar crystal in which a crystal of plastic aluminum titanate (Al ₂ TiO ₅ ) and a crystal of magnesium titanate (MgT ₂ iO ₅ ) are dissolved. Then, the molar ratio of Al ₂ TiO ₅ is changed to 1.000 to 0.000, if the molar ratio of MgT i ₂ O ₅ is changed to _{0.000~1.000, Al 2 O 3, TiO} 2 and A molded body having a MgO ratio of 100% by mass as a whole is obtained. In the firing step S30, the compact was fired at a firing temperature of 1500 (° C). C14-C20 plastic ceramics are obtained.

  Each sample No. Table 9 also shows the open porosity (%) of C14 to C20. In addition, each sample No. Regarding C14 to C20 plastic ceramics, the bending strength (MPa), strain (%), internal friction and Young's modulus (GPa) are measured as in Test Example 1. The results are also shown in Table 9.

  And in impregnation process S40, each sample No. shown in Table 10 is impregnated by impregnating the plastic ceramic of each sample No. C14-C20 with methyl methacrylate. 18 to 24 damping members are obtained. Moreover, in impregnation process S40, each sample No. shown in Table 10 was impregnated by impregnating the plastic ceramic of each sample No. C14-C20 with S-lauryl methacrylate. The damping member of 25-31 is obtained.

  Each sample No. For the vibration damping members 18 to 24, the bending strength (MPa), strain (%), internal friction, and Young's modulus (GPa) are measured in the same manner as in Test Example 1. The results are also shown in Table 10. In addition, each sample No. Regarding the damping member of 25 to 31, the bending strength (MPa), strain (%), internal friction and Young's modulus (GPa) are measured as in Test Example 1. The results are also shown in Table 10.

  From Table 9 and Table 10, each sample No. The vibration damping members 18 to 24 have the sample Nos. The strain is extremely small as compared with plastic ceramics of C14 to C20. Also, the bending strength is extremely high. Furthermore, the internal friction is reduced and the Young's modulus is increased. In addition, as shown in Table 9 and Table 10, each sample No. The damping members of 25 to 31 are sample Nos. The strain is generally smaller than that of C14 to C20 plastic ceramics. Also, the bending strength is extremely high. Furthermore, the internal friction is generally large, and the Young's modulus is large.

In particular, in order for the vibration damping member to have sufficient vibration damping properties, it is necessary to satisfy the requirement that the internal friction is approximately 0.01 or more. In this regard, from Table 9 and Table 10, each sample No.18~23 and each sample No. In the damping member of 25-31, the internal friction is 0.0142-0.0427, and therefore the requirement is satisfied. Moreover, each sample No. 18-24 and each sample No. It can be seen that the damping members of 26 to 31 have Young's moduli of 53.1 to 122.5 (GPa), and therefore have Young's moduli that are substantially equal to or higher than those of aluminum alloys and the like.

Here, FIG. 2 shows changes in internal friction and Young's modulus of the damping member with respect to the molar ratio of magnesium titanate (MgTi ₂ O ₅ ). It is considered that magnesium titanate crystals are formed in plastic ceramics by MgO, and columnar crystals composed of aluminum titanate crystals and magnesium titanate crystals are formed in plastic ceramics. Thus, it is considered that the internal friction of the damping member can be increased by the grain boundaries, and the Young's modulus can be increased.

(Test Example 6)
In the method for manufacturing a vibration damping member of Test Example 6, similarly to Test Example 5, the molded body is molded by performing the mixing step S10 and the molding step S20 so that the mass% shown in Tables 11 and 12 is obtained. In the firing step S30, the compact was fired at a firing temperature of 1550 (° C). C21-C27 plastic ceramics are obtained.

そして、含浸工程Ｓ４０において、各試料Ｎｏ.Ｃ２１〜Ｃ２７の塑性セラミックスにメタクリル酸Ｓ−ラウリル、メタクリル酸メチル又はメタクリル酸２−エチルヘキシルを含浸させることによって、表１１及び表１２に示す各試料Ｎｏ．３２〜３８の制振部材を得る。

And in impregnation process S40, each sample No. shown in Table 11 and Table 12 was made to impregnate the plastic ceramic of each sample No. C21-C27 with S- lauryl methacrylate, methyl methacrylate, or 2-ethylhexyl methacrylate. A 32-38 damping member is obtained.

Each sample No. As with Test Example 1, the internal friction and Young's modulus (GPa) are measured for the vibration damping members 32 to 38. The results of internal friction are shown in Table 11, and the Young's modulus results are shown in Table 12. FIG. 3 shows the change in internal friction of the damping member relative to the molar ratio of magnesium titanate (MgTi ₂ O ₅ ), and FIG. 4 shows the change in Young's modulus of the damping member.

From Table 11 and FIG. C21-C27 plastic ceramics also have a relatively large internal friction. And each sample No. impregnated with S- lauryl methacrylate, methyl methacrylate or 2-ethylhexyl methacrylate was impregnated. The damping members of 32 to 38 are those sample Nos. The internal friction may be lower than that of C21 to C27 plastic ceramics. The reason for this is considered to be that the resin restrains the movement of the crystal that causes internal friction. Moreover, from Table 12 and FIG. 4, each sample No. impregnated with S- lauryl methacrylate, methyl methacrylate or 2-ethylhexyl methacrylate was impregnated. The damping members of Nos. 32-38 are sample Nos. Not impregnated with resin. The Young's modulus is much higher than that of C21 to C27 plastic ceramics. For this reason, these sample Nos. It is considered that the damping members 32 to 38 are particularly suitable for application to, for example, the arm of a hard disk head or a sample holder of an electron microscope.

  From the above test examples, it is considered that the vibration damping member of the present invention preferably performs the firing step S30 at a firing temperature of 1400 to 1550 ° C.

From Test Examples 1 to 6, the range of internal friction that can occur in the aluminum titanate-based plastic ceramics can be displayed in the ternary composition diagram shown in FIG. The plastic ceramic will generate high internal friction within the range indicated by the frame lines A1 and A2. Here, in the range indicated by the frame line A1, internal friction higher than that in the range indicated by the frame line A2 occurs. In particular, if the total of Al ₂ O ₃ , TiO ₂ and MgO is 100% by mass, Al ₂ O ₃ is 59% by mass or less, TiO ₂ is 38% by mass or more, and the rest is MgO. The member generally has an internal friction of 0.01 or more. For this reason, it will have sufficient damping property as a damping member.

  Further, the range of internal friction that can occur in the vibration damping member when the aluminum titanate plastic ceramic is impregnated with methyl methacrylate can be displayed in the ternary composition diagram shown in FIG. The vibration damping member generates high internal friction within the range indicated by the frame lines B1, B2, and B3. Here, in the range indicated by the frame line B1, higher internal friction is generated than in the range indicated by the frame line B2. Within the range indicated by the frame line B2, higher internal friction is generated than within the range indicated by the frame line B3. Further, the range of Young's modulus that can occur in the vibration damping member can be displayed in the ternary composition diagram shown in FIG.

  Furthermore, from Test Example 4 and Test Example 5, the range of internal friction that can occur in the vibration damping member when aluminum titanate plastic ceramic is impregnated with S-lauryl methacrylate is shown in FIG. Can be displayed in the figure. The vibration damping member generates high internal friction within the range indicated by the frame lines C1, C2, and C3. Here, in the range shown by the frame line C1, higher internal friction is generated than in the range shown by the frame line C2. Within the range indicated by the frame line C2, higher internal friction is generated than within the range indicated by the frame line C3. Further, the range of Young's modulus that can occur in the vibration damping member can be displayed in the ternary composition diagram shown in FIG.

As described above, in the vibration damping member of the embodiment, the plastic ceramic is obtained by firing the raw material substantially composed of Al ₂ O ₃ , TiO _2, and MgO. At that time, Al ₂ O ₃ and TiO ₂ constitute crystals of aluminum titanate (Al ₂ TiO ₅ ), and MgO constitutes magnesium titanate (MgTi ₂ O ₅ ) together with TiO ₂ . In these plastic ceramics, these crystals form solid crystals to form columnar crystals, each of which has microcracks at the grain boundaries, and the columnar crystals are entangled with each other, and the strain is reliably displayed at a high value, enabling large plastic deformation. It is considered that Thus, in this plastic ceramic, internal friction increases due to large strain caused by microcracks. Further, the Young's modulus is maintained high by the columnar crystals. For this reason, it is thought that the damping member of embodiment can be provided with the more excellent damping property.

  The vibration damping member according to the present invention can be used for structural parts that require higher accuracy, structural parts such as machines that require high resolution, and the like.

It is process drawing of the manufacturing method of a damping member concerning embodiment. It is a graph which shows the change of the internal friction and the Young's modulus with respect to the test examples 1-5 of embodiment with respect to the molar ratio of magnesium titanate. It is a graph which shows the change of the internal friction with respect to the test example 6 with respect to the molar ratio of a magnesium titanate. It is a graph which concerns on Test Example 6 and shows the change of the Young's modulus with respect to the molar ratio of magnesium titanate. It is a ternary composition diagram showing the range of internal friction that can occur in an aluminum titanate-based plastic ceramic according to the embodiment. It is a ternary composition diagram showing the range of internal friction that can occur in the vibration damping member when impregnated with methyl methacrylate according to the embodiment. It is a ternary composition diagram showing a range of Young's modulus that can occur in the vibration damping member when impregnated with methyl methacrylate according to the embodiment. FIG. 4 is a three-component composition diagram showing a range of internal friction that can occur in the vibration damping member when impregnated with S-lauryl methacrylate according to the embodiment. It is a ternary composition diagram showing a range of Young's modulus that can occur in a vibration damping member when impregnated with S-lauryl methacrylate according to an embodiment.

Explanation of symbols

S10 ... Preparation step S20 ... Molding step S30 ... Firing step S40 ... Impregnation step

Claims (3)

As Al ₂ O _3, TiO ₂ and 100% by weight of total of MgO, the Al ₂ O ₃ is at most 59% by weight, in the TiO ₂ is 38 mass% or more, Ri remain the MgO der, and It consists of an aluminum titanate-based plastic ceramic that has microcracks at the grain boundaries and can be plastically deformed by entanglement of columnar crystals , and a resin impregnated with the plastic ceramic, and has an internal friction of 0.0104 to 0.0427. A damping member having a Young's modulus of 53.5 to 124.2 (GPa).   The vibration damping member according to claim 1, wherein the resin is a thermosetting resin.   The vibration damping member according to claim 2, wherein the thermosetting resin is a thermosetting acrylic resin.

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