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Ultrasonic test method and equipment for ceramic honeycomb structure

A ceramic honeycomb and honeycomb technology, applied in the direction of using ultrasonic/sonic/infrasonic waves, separation methods, using sound waves/ultrasonic/infrasonic waves for material analysis, etc., can solve the problems of unreliable detection of cracks, long-term problems, etc.

Active Publication Date: 2012-06-27
康宁(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other techniques that work on the same principle as X-ray inspection (such as tomography and tomography) also have the same disadvantages. They require much longer time and much more effort, so they cannot be used in practical applications. Efficient and reliable detection of cracks and other discontinuities within the time frame of the manufacturing process

Method used

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  • Ultrasonic test method and equipment for ceramic honeycomb structure
  • Ultrasonic test method and equipment for ceramic honeycomb structure
  • Ultrasonic test method and equipment for ceramic honeycomb structure

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Embodiment Construction

[0035] Now, refer to Figure 1A , 1B and 1C, the method and apparatus of the present invention are particularly suitable for detecting discontinuities or other non-uniformities that may exist in ceramic honeycomb structures 1 used in diesel engines and automotive exhaust systems. This structure comprises a grid 3 of mesh walls 5 for defining air-guiding cells 7 along the axis of rotation of the structure 1 . The mesh 3 of the mesh wall 5 is surrounded by a skin 9 . The outer skin 9 has an inner edge 11 which is generally integrally (except at defects) connected to the outer edge of the mesh 3 of the mesh wall 5, Figure 1B best shown. The resulting tank-shaped structure has an inlet port 13 for receiving exhaust gases from a diesel or car engine, and an outlet port 15 for exhausting these gases.

[0036] The ceramic honeycomb substrate 1 used as a flow-through catalyst substrate has completely open cells 7 between an inlet end 13 and an outlet end 15 . The density of cells...

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PUM

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Abstract

A method and device for detecting the presence or absence of internal discontinuities or inhomogeneities in a fired or green ceramic honeycomb structure is provided. In the method, an ultrasonic transmitter (33) and receiver (35) are positioned on outer locations of the honeycomb structure, and the transmitter is actuated to generate an ultrasonic wave that is conducted through an inner portion of the honeycomb structure (40), and received by the ultrasonic receiver. The received ultrasonic wave is filtered and then analyzed to determine the presence of internal discontinuities (17). The transmitter generates ultrasonic waves having a frequency of five megahertz or less to maintain a high signal to noise ratio in the propagated wave received by the ultrasonic receiver. The device of the invention includes an array of ultrasonic transmitters and receivers which are simultaneously actuated as a ceramic substrate is moved relative thereto to quickly and efficiently provide a full, non-contact scan of the ceramic body for discontinuities.

Description

technical field [0001] The present invention relates generally to methods for detecting internal discontinuities in ceramic honeycomb structures and, more particularly, to an ultrasonic testing method and apparatus for quickly and efficiently determining the presence or absence of internal discontinuities within such structures . Background technique [0002] Ceramic honeycomb structures are used in vehicle exhaust systems to reduce pollutants. Such structures generally comprise a network of interconnected walls forming a matrix of elongated air-conducting cells, which may be, for example, square, octagonal or hexagonal. The reticulated walls are preferably surrounded by a cylindrical skin integrally attached to the outer edges of these walls to form a pot-shaped structure or oval structure, such structures having opposing inlets and outlets for passage through the A matrix of cells receives exhaust and exhausts it. [0003] The ceramic honeycomb structure could be used a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/00G01B17/00C04B33/00C04B35/10C04B35/195G01S15/00
CPCB01D2279/30B01D2046/2433B01D46/0086B01D46/2418B01D2273/18B01D46/2429
Inventor L·E·汉普顿Z·史
Owner 康宁(上海)有限公司