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US 2026/0217594 A1Published application
Low-thermal expansion member
AssigneeNippon Electric Glass Co., Ltd.
InventorsYuki YOKOTA, Yuki NISHIMURA, Yusuke OKADA, Yohei HOSODA
Life of this patent
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Abstract
Provided is a low-thermal expansion member having a low coefficient of thermal expansion, like conventional Li2O—Al2O3—SiO2-based crystallized glasses, and being low in cost. A low-thermal expansion member contains a MgO—Al2O3—SiO2-based crystal.
Claims28
1:
- A low-thermal expansion member containing a MgO—Al2O3—SiO2-based crystal.
2:
- The low-thermal expansion member according to claim 1, containing α-cordierite and having transmittancy.
3:
- The low-thermal expansion member according to claim 2, containing, in terms of % by mass, 20 to 90% SiO2, more than 0 to 50% Al2O3, and more than 0 to 40% MgO.
4:
- The low-thermal expansion member according to claim 2, wherein SiO2/(SiO2+Al2O3+MgO) is 0.45 to 0.81 in terms of % by mass.
5:
- The low-thermal expansion member according to claim 2, wherein Al2O3/(SiO2+Al2O3+MgO) is 0.01 to 0.45 in terms of % by mass.
6:
- The low-thermal expansion member according to claim 2, wherein MgO/(SiO2+Al2O3+MgO) is 0.03 to 0.29 in terms of % by mass.
7:
- The low-thermal expansion member according to claim 2, wherein SiO2/Al2O3 is 1 to 15 in terms of % by mass.
8:
- The low-thermal expansion member according to claim 2, wherein SiO2/MgO is 2 to 15 in terms of % by mass.
9:
- The low-thermal expansion member according to claim 2, wherein Al2O3/MgO is 0.2 to 15 in terms of % by mass.
10:
- The low-thermal expansion member according to claim 2, wherein, in terms of % by mass, the low-thermal expansion member contains 0 to 5.6% BaO, SiO2/Al2O3 is 2.5 to 15, and SiO2/MgO is 5.4 to 15.
11:
- The low-thermal expansion member according to claim 2, wherein, in terms of % by mass, the low-thermal expansion member contains 0 to 5.6% BaO, SiO2/Al2O3 is 2.5 to 15, and Al2O3/MgO is 1.8 to 15.
12:
- The low-thermal expansion member according to claim 2, containing, in terms of % by mass, 55.5 to 90% SiO2 and more than 0% ZnO.
13:
- The low-thermal expansion member according to claim 2, wherein (Li2O+Na2O+K2O)/SiO2 is 0.00005 to 0.03 in terms of % by mass.
14:
- The low-thermal expansion member according to claim 2, wherein Li2O+Na2O+K2O+CaO+SrO+BaO is not more than 2% in terms of % by mass.
15:
- The low-thermal expansion member according to claim 2, wherein (SiO2+ZnO)/(MgO+Al2O3) is 0.7 to 3 in terms of % by mass.
16:
- The low-thermal expansion member according to claim 2, wherein ZnO—(TiO2+ZrO2) is −15 to 5% in terms of % by mass.
17:
- The low-thermal expansion member according to claim 2, wherein TiO2/(TiO2+Fe2O3) is 0.001 to 0.999 in terms of % by mass.
18:
- The low-thermal expansion member according to claim 2, containing at least one of MoO3, V2O5, CuO, NiO, MnO2, Cr2O3, Nd2O3, WO3, and Co3O4.
19:
- The low-thermal expansion member according to claim 2, containing more than 0% MoO3 in terms of % by mass.
20:
- The low-thermal expansion member according to claim 2, wherein, in terms of % by mass, SiO2/(SiO2+Al2O3+MgO) is 0.36 to 0.81, Al2O3/(SiO2+Al2O3+MgO) is 0.09 to 0.5, MgO/(SiO2+Al2O3+MgO) is 0.01 to 0.29, and the low-thermal expansion member contains 0.01 to less than 2.5% Na2O and at least one of As2O3, Sb2O3, SnO2, and Cl.
21:
- The low-thermal expansion member according to claim 1, wherein a β-OH value is more than 0 to 2/mm.
22:
- The low-thermal expansion member according to claim 1, wherein a transmittance at a thickness of 4 mm and a wavelength of 1200 nm is not less than 10%.
23:
- The low-thermal expansion member according to claim 1, wherein a coefficient of thermal expansion at 30 to 380° C. is not more than 30×10−7/° C.
24:
- The low-thermal expansion member according to claim 1, wherein a coefficient of thermal expansion at 30 to 750° C. is not more than 30×10−7/° C.
25:
- The low-thermal expansion member according to claim 1, being a crystallized glass.
26:
- A precursor of a low-thermal expansion member, the precursor being made of a crystallizable glass containing, in terms of % by mass, 20 to 90% SiO2, more than 0 to 50% Al2O3, more than 0 to 40% MgO, 0 to 20% CaO, 0 to 20% SrO, 0 to 20% BaO, 0 to 20% ZnO, 0 to 10% Li2O, 0 to 20% Na2O, 0 to 20% K2O, 0 to 20% B2O3, 0 to 20% P2O5, 0 to 20% TiO2, 0 to 20% ZrO2, 0 to 10% HfO2, and 0 to 20% SnO2.
27:
- A method for producing the low-thermal expansion member according to claim 25, the method comprising the steps of:
- heating a raw material into a melt and forming the melt into a shape to obtain a crystallizable glass;
- and
- subjecting the crystallizable glass to heat treatment to crystallize the crystallizable glass.
1 more element
28:
- The method for producing the low-thermal expansion member according to claim 27, wherein an amount of metal Al added to the raw material is more than 0 to 5000 ppm in terms of % by mass.