Material for thermal barrier coating
A heat-insulating coating and base material technology, applied in coating, metal material coating process, air transportation, etc., can solve problems such as residual tensile stress
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Embodiment 1
[0050] It is known that by changing the conditions for solving the basic equations of quantum mechanics, various physical property values at the nanometer level can be obtained. This method is a non-empirical calculation method that does not use any test results as the calculation parameters and obtains the required data. It is called "first-principle calculation". In the present invention, this first-principle calculation is used to estimate the thermal expansion coefficient α and the thermal conductivity λ from the crystal structure.
[0051] (From;
[0052] http: / / www.nistep.go.jp / achiev / ftx / jpn / stfc / stt009j / feature3.html#4-0 "Science and Technology Trends" December 2001, Science and Technology Trends Research Center, Science and Technology Policy Research Institute, Ministry of Education, Culture, Sports, Science and Technology of Japan)
[0053] First, the inventors studied the thermal expansion coefficient α and thermal conductivity λ estimated from the crystal structure...
Embodiment 2
[0067] In this example, the composite of the materials whose thermal expansion coefficient and thermal conductivity were measured in the above-mentioned Example 1 was studied.
[0068] According to Example 1, La 2 Si 2 O 7 , La 2 Ti 2 O 7 , Sr 2 Ta 2 O 7 And LaTaO 4 Since its thermal expansion rate is lower than that of zirconia, tensile stress may be generated when it is used as a thermal insulation coating material. Therefore, in order to maintain the low thermal conductivity of these materials and increase the coefficient of thermal expansion, the combination of them with other high thermal expansion materials described in Table 1 has been studied.
[0069] When two types of ceramics with a large difference in thermal expansion coefficient are combined, the thermal expansion coefficient of the composite material (α c ) Is represented by the following equation (3) called Turner's equation. In formula (3), α is the thermal expansion rate, K is the bulk modulus of elasticity, V is...
Embodiment 3
[0082] Although MG 2 SiO 4 In electrical equipment such as IC substrates and components, the electrical equipment is used as an insulating material, but is not used in an example of a high temperature structural material represented by a heat insulating coating. The inventors focus on MG 2 SiO 4 The high thermal expansion and low thermal conductivity are taken into account the application of the heat insulating coating, first for MG 2 SiO 4 And its similar compound was studied.
[0083] Mg 2 SiO 4 The mineral name is magnesium olivine, belongs to the oblique crystal, and has the PMNB according to the spatial group. 2 SiO 4 (M olivine-type structure of the M is a ferrous metal element). It belongs to this raw square crystal, has a spatial group PMNB classification to M 2 SiO 4 (M2-valent metal elements) of olivine-shaped structures and Fe 2 SiO 4 (Mineral iron olivine), MN 2 SiO 4 (Mineral named olivine), Ni 2 SiO 4 (Mineral nickel olivine), CO 2 SiO 4 Wait.
[0084] The talent met...
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