Radiation-resistant inorganic material and fiber thereof
An inorganic material including SiO 2 , Al 2 O 3 , CaO, and Fe 2 O 3 as components, in which the mass percentages of the components in terms of oxide in the inorganic material are set as follows: i) the total content of SiO 2 and Al 2 O 3 is from 40% by mass to 70% by mass; ii) the ratio Al 2 O 3 /(SiO 2 +Al 2 O 3 ) (mass ratio) is in the range of 0.15 to 0.40; iii) the content of Fe 2 O 3 is from 16% by mass to 25% by mass; and iv) the content of CaO is from 5% by mass to 30% by mass, can be produced as an inorganic material having excellent melt spinnability and excellent radiation resistance.
1 . A fiber having radiation resistance comprising an inorganic material, wherein the inorganic material comprises SiO 2 , Al 2 O 3 , CaO, and Fe 2 O 3 as components,
wherein the mass percentages of the components in terms of oxide in the inorganic material are as follows:
i) the total content of SiO 2 and Al 2 O 3 is from 40% by mass to 70% by mass;
ii) the ratio Al 2 O 3 /(SiO 2 +Al 2 O 3 ) (mass ratio) is in the range of 0.15 to 0.40;
iii) the content of Fe 2 O 3 is from 21% by mass to 25% by mass; and
iv) the content of CaO is from 5% by mass to 25% by mass.
2 . The fiber according to claim 1 , wherein the content of CaO is from 5% by mass to 17% by mass.
3 . The fiber according to claim 1 , wherein the content of Fe 2 O 3 is from 21% by mass to 23% by mass.
4 . A fiber-reinforced composite material reinforced with the fiber according to claim 1 .
5 . The fiber-reinforced composite material according to claim 4 , wherein the fiber-reinforced composite material is a fiber-reinforced resin.
6 . The fiber-reinforced composite material according to claim 4 , wherein the fiber-reinforced composite material is a fiber-reinforced cement.
7 . A method for suppressing radiation-induced deterioration of a fiber-reinforced composite material comprising a base material and a fiber and constituting a part to be irradiated with radiation, the method comprising adding the inorganic fiber of claim 1 as said fiber to the base material.
8 . The method for suppressing radiation-induced deterioration according to claim 7 , wherein the content of CaO is from 5% by mass to 17% by mass.
9 . The method for suppressing radiation-induced deterioration according to claim 7 , wherein the content of Fe 2 O 3 is from 21% by mass to 23% by mass.
10 . A method for producing an inorganic fiber having radiation resistance,
the method comprising melt-spinning a mixture of a silica source, an alumina source, a calcium oxide source, and an iron oxide source,
wherein the mass percentages of SiO 2 , Al 2 O 3 , CaO, and Fe 2 O 3 in terms of oxide in the mixture are as follows:
i) the total content of SiO 2 and Al 2 O 3 is from 40% by mass to 70% by mass;
ii) the ratio Al 2 O 3 /(SiO 2 +Al 2 O 3 ) (mass ratio) is in the range of 0.15 to 0.40;
iii) the content of Fe 2 O 3 is from 21% by mass to 25% by mass; and
iv) the content of CaO is from 5% by mass to 25% by mass.
11 . The method for producing an inorganic fiber according to claim 10 , wherein the content of CaO is from 5% by mass to 17% by mass.
12 . The method for producing an inorganic fiber according to claim 10 , wherein the content of Fe 2 O 3 is from 21% by mass to 23% by mass.
13 . The method for producing an inorganic fiber according to claim 10 , wherein the inorganic fiber is used for a part to be irradiated with radiation.
14 . The method for producing an inorganic fiber according to claim 10 , wherein fly ash is used as the silica source or the alumina source.
15 . The method for producing an inorganic fiber according to claim 14 , wherein the iron oxide source is copper slag.
16 . The method for producing an inorganic fiber according to claim 15 , wherein the calcium oxide source is iron and steel slag.
17 . The method for producing an inorganic fiber according to claim 10 , wherein the silica source or the alumina source is basalt or andesite.
18 . The method for producing an inorganic fiber according to claim 17 , wherein the iron oxide source is copper slag.
19 . The method for producing an inorganic material fiber according to claim 18 , wherein the calcium oxide source is iron and steel slag.
20 . A part to be irradiated with radiation, the part comprising a fiber having radiation resistance, the fiber comprising an inorganic material, wherein the inorganic material comprises SiO 2 , Al 2 O 3 , CaO, and Fe 2 O 3 as components,
wherein the mass percentages of the components in terms of oxide in the inorganic material are as follows:
i) the total content of SiO 2 and Al 2 O 3 is from 40% by mass to 70% by mass;
ii) the ratio Al 2 O 3 /(SiO 2 +Al 2 O 3 ) (mass ratio) is in the range of 0.15 to 0.40;
iii) the content of Fe 2 O 3 is from 21% by mass to 25% by mass; and
iv) the content of CaO is from 5% by mass to 25% by mass.
21 . The part according to claim 20 , wherein the content of CaO is from 5% by mass to 17% by mass.
22 . The part according to claim 20 , wherein the content of Fe 2 O 3 is from 21% by mass to 23% by mass.
23 . The part according to claim 20 ,
wherein the part to be irradiated with radiation is any one of the following:
a) a nuclear reactor building, a nuclear reactor containment vessel, piping inside a nuclear reactor facility, and a decommissioning robot;
b) a space station building, a space station, an artificial satellite, a planetary exploration satellite, and a space suit; and
c) medical devices utilizing particle beams.