내화성 세라믹 섬유

한글명:내화성 세라믹 섬유

카스 번호142844-00-6

상품명:Refractories, fibers, aluminosilicate

CBNumberCB61215159

분자식Al6O13Si2

포뮬러 무게426.052428

MOL 파일142844-00-6.mol

동의어(한글)

내화성세라믹섬유

내화성세라믹섬유(Refractoryceramicfibers)

내화물 세라믹 섬유

화학적 성질

녹는점	>1650°C
밀도	2.6-2.7 g/cm3
저장 조건	Store at +5°C to +30°C.
물리적 상태	섬유질의(입자를 포함할 수 있음)
EPA	Refractory ceramic fibers (142844-00-6)

위험 및 안전 성명

위험품 표기	T
위험 카페고리 넘버	49
안전지침서	53-45
WGK 독일	3
HS 번호	6806 10 00

그림문자(GHS)

내화성 세라믹 섬유 화학적 특성, 용도, 생산

개요
Aluminosilicate fibers (commonly called refractory ceramic fibers (RCFs) in the United States) are amorphous fibers belonging to a class of materials termed synthetic vitreous fibers (SVFs), also termed man-made mineral fibers or manmade vitreous fibers. This class of materials also includes glass wool, rock (stone) wool, slag wool, mineral wool, and specialpurpose glass fibers. Fibers can be classified in various ways, such as natural versus synthetic, organic versus inorganic, and crystalline versus amorphous. Several fiber taxonomies have been proposed.
Aluminosilicate wools (ASWs) were first invented in the early 1940s and commercialized in the 1950s in the United States and somewhat later in other countries. Substantial energy price increases beginning in the 1970s increased the economic benefits of energy conservation and the market for these fibers.
ASWs are SVFs produced by melting (at ～1925°C) alumina, silica, and other inorganic oxides, and then blowing or spinning these melts into fibers. These fibers can also be produced by melting blends of calcined kaolin, alumina, and silica. The bulk fibers produced by this process can be used directly for some applications, but are more commonly converted into other physical forms, including blanket, modules (folded blanket capable of being installed rapidly in industrial furnaces), paper, felt, board, vacuum formed parts, textiles, and putties or pastes. Conversion to various physical forms takes place at locations where aluminosilicate fibers are produced, facilities operated by converters (producers of intermediate goods) or end users. Primary manufacturing facilities for aluminosilicate fibers are located in North and South America, Europe, and Asia. Conversion facilities and end users are distributed throughout the industrialized world.
화학적 성질
Refractory ceramic fibers are aluminum silicates with varying amounts of metal oxides and other materials, depending upon the raw materials.
The following is a guideline for the range of components by percentage SiO2, 47–54%; Al2 O3, 35–51%; CaO, ＜1%; MgO,＜1%; Na2O,＜1%; K2O,＜1%; Fe2O3, 0–1%; TiO2, 0–2%; ZrO2, 0–17%. Nominal fiber diameter at manufacture is approximately 2–3 μm (26, 68a). The chemistry of fiber formulations is constantly evolving to meet market demands (16d).Irritation may occur due to fibers on skin or in the eyes (16d).
용도
ASWs have several desirable properties for use as hightemperature insulating materials, including low thermal conductivity, low heat storage (low volumetric heat capacity), thermal shock resistance, lightweight, good corrosion resistance, and ease of installation. Depending upon the fiber composition, the maximum end-use temperature for ASWs can be as high as 1430°C (2600°F). Because of this capability, these fibers are also included in the class of high-temperature insulating wools (HTIWs). Benefits of the use of ASW insulation include reduced energy costs and reduced greenhouse gas emissions. The energy savings can be substantial when compared to conventional high-temperature insulation such as insulating firebrick.
Applications and markets for ASWs are principally industrial and vary by product form and country including furnace linings and components in the cement, ceramic, chemical, fertilizer, forging, foundry, glass, heat treating, nonferrous metals, petrochemical, power generation (cogeneration), and steel industries. ASWs are used for passive fire protection applications where thin, lightweight materials are needed to prevent flame penetration. ASWs are also used to a minor degree in emission control applications such as heat shield insulation, catalytic converter support mat, and filtration media for air bag inflators. Though sometimes referred to in the literature as a substitute for asbestos, aluminosilicate fibers are not typically used in asbestos applications. Aluminosilicate fibers are priced substantially higher than various types of asbestos and have maximum end-use temperatures substantially greater than those for asbestos (which vary depending upon the product but are typically°850°C).
생산 방법
Refractory ceramic fiber is produced from a mixture of sand and alumina or kaolin. Metal oxides such as titanium and zinc may be added, depending upon the final desired specifications (16d, 26). The raw materials are transferred to the furnace where the batch is melted. As the molten mix flows from the furnace, it is fiberized as it passes a stream of air and steam or falls on rotating disks. The fiber diameters are in the range of 0.5–10 μm, and have lengths up to several centimeters (69). Some raw fiber may be packaged in bulk for sale or for use in products containing RCF. Alternatively, raw fiber enters a chamber where it is sprayed with lubricating oil and allowed to settle onto a moving conveyor. This material moves through a needler, where opposing units of close-set needles are forced through the RCF, interlocking the fibers and forming a blanket. The blanket is conveyed through an oven to burn off the lubricating oil, then trimmed to the required dimensions, rolled, and boxed.
Secondary processes involve the use of bulk fiber or blankets to produce additional products. These include vacuum- formed products, folded modules, braids and ropes, boards, and customer-specified shapes and use in catalytic converters, metal reinforcements, heat shields, brake pads, and airbags.
Fibers may undergo transformation from amorphous to crystalline forms during use in high temperature applications. Therefore, exposures to these so-called after-use fibers may include mullite, cristobalite, or other crystalline phases.
Carcinogenicity
In 2002, IARC (16d) classified refractory ceramic fibers as “possibly carcinogenic to humans” (Group 2B), based on inadequate evidence of carcinogenicity in humans and sufficient evidence in experimental animals. The American Conference of Governmental Industrial Hygienists has designated RCF as a suspected human carcinogen (A3).
Indulski et al. reported the numbers of occupational diseases diagnosed from 1984 to 1994 among 600 Polish workers employed in the manufacture of refractory ceramic fibers. No cases of lung cancer were cited. Lung fibrosis and silicosis were noted in four workers, ages 52–64 at diagnosis. The duration of employment ranged from 24 to 37 years preceding the manufacture of ceramic fibers; therefore, the authors note that the conditions could be related to earlier employment.
환경귀착
Numerous in vitro and in vivo studies have been conducted on both natural and synthetic fibers to try to understand and measure cytotoxicity, mutagenicity, and genotoxicity. Many of these studies have proven inconclusive, so mechanism(s) of action are still unclear. Other studies have indicated that aluminosilicate fibers are less active biologically than various forms of asbestos.

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