Iron oxide powder, composition, ceramics, iron oxide powder precursor, method for producing iron oxide powder precursor, and method for producing iron oxide powder

A technology of iron oxide powder and manufacturing method, which is applied in the direction of iron oxide/iron hydroxide, chemical instruments and methods, iron oxide, etc., which can solve the problems of fading and lack of chroma in color, and achieve the effect of high heat resistance

Pending Publication Date: 2021-02-19
KOGAKUIN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, its color lacks chroma
In addition, in applications exposed to high temperatures such as ceramics, the particles of hematite cause particle growth, and there is a problem of discoloration

Method used

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  • Iron oxide powder, composition, ceramics, iron oxide powder precursor, method for producing iron oxide powder precursor, and method for producing iron oxide powder
  • Iron oxide powder, composition, ceramics, iron oxide powder precursor, method for producing iron oxide powder precursor, and method for producing iron oxide powder
  • Iron oxide powder, composition, ceramics, iron oxide powder precursor, method for producing iron oxide powder precursor, and method for producing iron oxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8、 comparative example 1～3

[0152] according to figure 1 According to the flow chart, iron oxide powder is obtained.

[0153] First, add 0.5mol·dm to 100ml -3 Aluminum nitrate nonahydrate is added to the ferric nitrate aqueous solution according to the condition that the value of x=Al / (Al+Fe) reaches more than 0 and less than 0.8 (that is, the content of aluminum is more than 10 mol% and less than 80 mol%), as the starting solution .

[0154] Ammonium bicarbonate in an amount 12 times the molar amount (0.6 mol) of the metal ion was gradually added to the aqueous solution with stirring.

[0155] Then, it was stirred for 0 to 2 hours and left to stand for 0 to 6 hours. The resulting suspension was suction-washed with 1 L or more of pure water, replaced with an appropriate amount of ethanol, and dried in a vacuum to obtain an iron oxide precursor. All the obtained iron oxide powder precursors were brown in color.

[0156] The iron oxide powder precursor obtained in Examples is a porous structure with a...

Embodiment 7、8

[0194] In Examples 7 and 8, the precursor samples before firing were treated at a high temperature of 1200° C. for 2 hours, and evaluated according to the above-mentioned evaluation criteria. The results are shown in Table 1.

[0195] Regarding heat resistance, referring to Table 1, it can be seen that in Examples 4 to 6, even when exposed to a high temperature of 1100°C, the chroma is maintained at the same level as that of commercially available products, and it is also known that the red color can be maintained up to 1300°C by naked eye observation. In addition, in Examples 7 and 8, even though they were heated at a high temperature of 1200° C., the chroma of the obtained iron oxide powder was also good.

[0196] Additionally, if Figure 6 As shown, if referring to the chromaticity change when the commercial product and the powder sample of x=0.3 are heat-treated at high temperature, compared with the 1000°C reheated sample of the commercial product, the sample of the pres...

Embodiment 9-1～9-4、 comparative example 4-1～4-2

[0199] Iron oxide powder was prepared in the same manner as in Example 4 except that the concentration of the ferric nitrate aqueous solution was prepared as the value shown in Table 2. In addition, about the evaluation of heat resistance, it carried out similarly to said .

[0200] Wherein, embodiment 9-3 is identical with aforesaid embodiment 4.

[0201] [Table 2]

[0202]

[0203] It can be seen from Table 2 that, compared with the comparative example, the iron oxide powder obtained in the examples has higher chroma and better heat resistance. In particular, the concentration of the ferric nitrate aqueous solution is 0.3mol·dm -3 ~0.7mol·dm -3 In Examples 9-2 to 9-4 prepared within the range of , iron oxide powders with extremely high chroma and high heat resistance were obtained. In addition, if Figure 7 0.3mol·dm of extremely high chroma -3 (Also denoted as "0.3M")~0.7mol·dm -3 (also referred to as "0.7M"), it was confirmed that the particle form of the iron ox...

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Abstract

An iron oxide powder which has an aluminum content of from 10 mol% to 80 mol% (inclusive), and which is composed of porous structures that have a diameter of from 0.3 [mu]m to 2 [mu]m (inclusive).

Description

technical field [0001] The present invention relates to an iron oxide powder, a composition, a ceramic, an iron oxide powder precursor, a method for producing the iron oxide powder precursor, and a method for producing the iron oxide powder. Background technique [0002] Conventionally, as for iron oxide powder, it is known that red iron oxide powder mainly composed of hematite is used as a pigment for asphalt, ceramics, plastics, cosmetics, and the like. [0003] However, its colors lack chroma. In addition, in applications exposed to high temperatures such as ceramics, the particles of hematite cause particle growth, and there is a problem of discoloration. [0004] Hitherto, high-chroma iron oxide red pigments have been developed (see Patent Documents 1 to 3). In addition, hematite that exhibits a stable color even when heated at a high temperature has also been developed (see Patent Document 4). [0005] In addition, various studies have been conducted on hematite (se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
CPCC04B33/34C04B41/009C04B41/86C04B2111/82C04B41/5022C03C8/14C09C1/24C01P2006/12C01P2004/62C01P2004/61C01P2006/14C01P2002/60C01P2004/03C01G49/06C01P2004/20C01P2006/65C01P2006/62C01P2006/63C01P2006/64C04B33/00C04B41/4543C04B41/5036C04B2103/54C01G49/0045C01P2004/24C01P2004/32C01P2004/64C04B35/44C04B35/62222C04B35/62675C04B35/62813C04B35/62826
Inventor 桥本英树阿相英孝高田润藤井达生
Owner KOGAKUIN UNIVERSITY
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