Standard Test Method for Evaluating Oxidation Resistance of Silicon Carbide Refractories at Elevated Temperatures
Steam is used to accelerate the oxidation of SiC refractories at elevated temperatures. ASTM specifies a 500 hour test duration at a temperature between 800°C and 1200°C. The average volume and bulk density changes are measured on three specimens per material.
|PER TEST OF 1 MATERIAL||PER TEST OF 3 MATERIALS||PER TEST OF 6 MATERIALS|
|Basic Test Cost||$1890||$1890||$1890|
SIGNIFICANCE AND USE
The oxidation of silicon carbide refractories at elevated temperatures is an important consideration in the application of these refractories. The product of oxidation is amorphous silica or cristobalite, depending upon the temperature at which oxidation takes place. This oxide formation is associated with expansion and degradation of strength. The quantity of water vapor in the atmosphere greatly affects the rate of oxidation.
The test, which creates and measures the expansion, is suitable for guidance in product development and relative comparison in application work where oxidation potential is of concern. The variability of the test is such that it is not recommended for use as a referee test.
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 (SiO2) and its attendant crystalline growth.
1.2 This standard does not purport to address all of the safety concerns, 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.
Extracted, with permission, from ASTM C863 Standard Test Method for Evaluating Oxidation Resistance of Silicon Carbide Refractories at Elevated Temperatures, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the standard may be purchased from ASTM International, phone 610-832-9555, e-mail: email@example.com, website: www.astm.org.
FROM THE BLOG...
Orton is pleased to announce its partnership with Hot Disk of Gothenburg, Sweden representing Hot...
01/07/2021Jessica Putnam-Phillips on ClayShare
Jessica explains how Pyrometric cones help the firing process. Click here to Watch her on ClayShare...
09/03/2020Sue McLeod and Witness Cones
We ran across this recent post from Sue McLeod that explains why she uses Witness Cones in her firings. ...