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November/December 2008
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Ceramic Honeycomb for Automotive Catalytic Converter

Flexural Strength of Honeycomb Ceramics

Honeycomb ceramics, porous with linear hollow channels, are currently being used worldwide in automotive catalytic converters and as diesel particulate filters for trucks. Flexural testing of this type of ceramics is addressed in a new ASTM International standard, C1674, Test Method for Flexural Strength of Advanced Ceramics with Engineered Porosity (Honeycomb Cellular Channels) at Ambient Temperatures. C1674 was developed by Subcommittee C28.04 on Applications, part of ASTM International Committee C28 on Advanced Ceramics.

“With a growing market, ceramic producers and automotive users need to have a well-defined, comprehensive consensus standard for characterizing the mechanical strength of these ceramics as a function of geometry, materials and environmental exposure,” says Stephen Gonczy, president, Gateway Materials Technology, current C28 chair and an ASTM member for more than 20 years. “C1674 will be used to test the quality and durability of ceramic honeycombs used in automotive catalyst supports, diesel particulate filters and combustion burner plates.”

Ceramic producers, filter and catalyst suppliers, and automotive and truck manufacturers will use the new standard to test production materials, develop new compositions and configurations, and evaluate the environmental durability of the material.

According to Gonczy, Subcommittee C28.04 is going to develop other mechanical and physical tests for honeycomb ceramics. In addition, the subcommittee will also be working on standards for porous ceramics with three-dimensional cellular ceramic foam structures that are being used as filters and energy absorption materials.

Gonczy also notes that the task group that developed C1674 is now working on an extensive interlaboratory study to quantify the repeatability and reproducibility of the honeycomb flexure test across a range of compositions, architectures and specimen sizes. Ceramic producers and end users are welcome to join the task group as well as Subcommittee C28.04.

CONTACT

Technical Information: Stephen T. Gonczy, Gateway Materials Technology, Mt. Prospect, Ill.

Phone: 847-870-1621

ASTM Staff: Joe Koury

Phone: 610-832-9804