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ASTM C863-00

(Test Method)

Standard Test Method for Evaluating Oxidation Resistance of Silicon Carbide Refractories at Elevated Temperatures

Standard Test Method for Evaluating Oxidation Resistance of Silicon Carbide Refractories at Elevated Temperatures

SCOPE
1.1 This test method covers the evaluation of the oxidation resistance of silicon carbide refractories at elevated temperatures in an atmosphere of steam. The steam is used to accelerate the test. Oxidation resistance is the ability of the silicon carbide (SiC) in the refractory to resist conversion to silicon dioxide (SiO 2 ) and its attendant crystalline growth.  
1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-Oct-2000
ICS
81.080 - Refractories
Technical Committee
C08 - Refractories
Drafting Committee
C08.04 - Chemical Behaviors
Current Stage
Ref Project

Relations

Replaced By
ASTM C863-00(2005) - Standard Test Method for Evaluating Oxidation Resistance of Silicon Carbide Refractories at Elevated Temperatures
Effective Date
01-Dec-2005

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ASTM C863-00 - Standard Test Method for Evaluating Oxidation Resistance of Silicon Carbide Refractories at Elevated TemperaturesASTM C863-00 - Standard Test Method for Evaluating Oxidation Resistance of Silicon Carbide Refractories at Elevated Temperatures
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ASTM C863-00 - Standard Test Method for Evaluating Oxidation Resistance of Silicon Carbide Refractories at Elevated Temperatures
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C 863–00
Standard Test Method for
Evaluating Oxidation Resistance of Silicon Carbide
Refractories at Elevated Temperatures
This standard is issued under the fixed designation C 863; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope comparison in application work where oxidation potential is of
concern. The variability of the test is such that it is not
1.1 This test method covers the evaluation of the oxidation
recommended for use as a referee test.
resistance of silicon carbide refractories at elevated tempera-
tures in an atmosphere of steam. The steam is used to
4. Apparatus
accelerate the test. Oxidation resistance is the ability of the
4.1 Heated Chamber—The chamber shall be muffled (Note
silicon carbide (SiC) in the refractory to resist conversion to
1) to confine the atmosphere. The size of the chamber and the
silicon dioxide (SiO ) and its attendant crystalline growth.
heat source are optional. The temperature capability within the
1.2 This standard does not purport to address all of the
chamber shall be at least 1200°C (2190°F) with an allowable
safety concerns, if any, associated with its use. It is the
deviation of 615°C (27°F) measured across the hearth.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
NOTE 1—Silicon carbide refractory material is recommended for use as
bility of regulatory limitations prior to use. the muffle but other suitable refractory materials may be used.
4.2 Instrument—Control and record the temperature of the
2. Referenced Documents
chamber by a suitable instrument capable of maintaining the
2.1 ASTM Standards:
requirements in 4.1. Recommended thermocouple location is
C 20 Test Methods for Apparent Porosity, Water Absorp-
within 1 in. (25 mm) of the top of the specimens and over the
tion, Apparent Specific Gravity, and Bulk Density of
center of the same assemblage.
Burned Refractory Brick and Shapes and Shapes by
Boiling Water
5. Test Specimen
C 830 Test Methods for Apparent Porosity, Liquid Absorp-
5.1 Specimen Size—Obtain a quarter-brick size from a
tion, Apparent Specific Gravity, and Bulk Density of
229-mm (9-in.) straight by cutting the brick along planes
Refractory Shapes by Vacuum Pressure
paralleltoboththe229by64-mm(9by2 ⁄2-in.)andthe114by
C 914 Test Method for Bulk Density and Volume of Solid
1 1
64-mm (4 ⁄2 by 2 ⁄2-in.) faces. Alternative specimens may be
Refractories by Wax Immersion
1 1 7
tile, 165 by 114 by 22 mm (6 ⁄2 by 4 ⁄2 by ⁄8 in.), or other
convenient shapes.
3. Significance and Use
5.2 Three specimens are required for each set of conditions.
3.1 The oxidation of silicon carbide refractories at elevated
temperatures is an important consideration in the application of 6. Conditions
these refractories.The product of oxidation is amorphous silica
6.1 Atmosphere—Steam is passed into the chamber (4.1) at
3 3
or cristobalite, depending upon the temperature at which
the rate of 32 kg/m (2 lb/ft ) of chamber volume per hour.
oxidation takes place. This oxide formation is associated with
Provisionsshouldbemadetouniformlydistributesteamwithin
expansion and degradation of strength. The quantity of water
the chamber.
vapor in the atmosphere greatly affects the rate of oxidation.
6.2 The standard test temperatures are as follows with new
3.2 The test, which creates and measures the expansion, is
samples used at each temperature. Each temperature consti-
suitable for guidance in product development and relative
tutes a test.
800°C (1470°F)
900°C (1650°F)
This test method is under the jurisdiction of ASTM Committee C08 on
1000°C (1830°F)
Refractories and is the direct responsibility of Subcommittee C08.04 on Chemical
1100°C (2010°F)
Behaviors.
1200°C (2190°F)
Current edition approved Oct. 10, 2000. Published December 2000. Originally
published as C 86
...

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1.1 This test method covers the determination of the true specific gravity of solid materials, and is particularly useful for materials that easily hydrate which are not suitable for test with Test Method C135. This test method may be used as an alternate for Test Methods C135, C128, and C188 for determining true specific gravity.  
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SCOPE
1.1 This test method covers a procedure for comparing the behavior of refractories in contact with vapors under conditions intended to simulate the environment within a glass-melting or other type of furnace when refractories are exposed to vapors from raw batch, molten glass, fuel, fuel contaminants, or other sources. This procedure is intended to accelerate service conditions for the purpose of determining in a relatively short time the interval resistance to fluxing, bloating, shrinkage, expansion, mineral conversion, disintegration, or other physical changes that may occur.  
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