Investigation of high-temperature ultrasonic transducer design using lithium niobate piezocomposite

K. J. Kirk, R. Hou, N. Schmarje, N. M. Pragada, L. Torbay, D. Hutson

Research output: Contribution to journalArticle

Abstract

The design and fabrication of lithium niobate piezocomposite transducers aims to achieve high-temperature ultrasonic NDT measurements at 400°C. In this paper, three aspects are investigated: exploring design parameters at room temperature by a comparison of experimental and modelled results for lithium niobate piezocomposites with an epoxy matrix; high-temperature electromechanical testing of lithium niobate piezocomposites with a cement matrix; and fabrication and testing of a high-temperature transducer operating at 400°C for defect detection. The piezocomposites were made with a 1-3 structure using a y/36°-cut lithium niobate single-crystal material. The typical piezocomposite thickness was 1 mm, with a pillar width of 0.4-0.8 mm, a kerf width of 0.5 mm, a volume fraction of lithium niobate of 30-40% and a pillar aspect ratio (pillar height to pillar width) ranging from 1 to 6. The operating frequency of the samples was between 1 MHz and 4 MHz. The results of the lithium niobate piezocomposite with an epoxy matrix and pillar aspect ratios of 3, 4 and 6 indicated that a high coupling coefficient kt should be achievable, even with a low pillar aspect ratio. The piezocomposite material was heated in air to 400-500°C over several thermal cycles and showed good stability of the electromechanical impedance spectrum. A 13 x 13 mm2 transducer with an operating frequency of 3 MHz was used to demonstrate the detection of an artificial defect in a steel block using a high-temperature couplant on a hot plate at 400°C.
Original languageEnglish
Pages (from-to)193-199
JournalInsight - Non-destructive Testing and Condition Monitoring
Volume57
Issue number4
DOIs
Publication statusPublished - Apr 2015

Cite this

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abstract = "The design and fabrication of lithium niobate piezocomposite transducers aims to achieve high-temperature ultrasonic NDT measurements at 400°C. In this paper, three aspects are investigated: exploring design parameters at room temperature by a comparison of experimental and modelled results for lithium niobate piezocomposites with an epoxy matrix; high-temperature electromechanical testing of lithium niobate piezocomposites with a cement matrix; and fabrication and testing of a high-temperature transducer operating at 400°C for defect detection. The piezocomposites were made with a 1-3 structure using a y/36°-cut lithium niobate single-crystal material. The typical piezocomposite thickness was 1 mm, with a pillar width of 0.4-0.8 mm, a kerf width of 0.5 mm, a volume fraction of lithium niobate of 30-40{\%} and a pillar aspect ratio (pillar height to pillar width) ranging from 1 to 6. The operating frequency of the samples was between 1 MHz and 4 MHz. The results of the lithium niobate piezocomposite with an epoxy matrix and pillar aspect ratios of 3, 4 and 6 indicated that a high coupling coefficient kt should be achievable, even with a low pillar aspect ratio. The piezocomposite material was heated in air to 400-500°C over several thermal cycles and showed good stability of the electromechanical impedance spectrum. A 13 x 13 mm2 transducer with an operating frequency of 3 MHz was used to demonstrate the detection of an artificial defect in a steel block using a high-temperature couplant on a hot plate at 400°C.",
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Investigation of high-temperature ultrasonic transducer design using lithium niobate piezocomposite. / Kirk, K. J.; Hou, R.; Schmarje, N.; Pragada, N. M.; Torbay, L.; Hutson, D.

In: Insight - Non-destructive Testing and Condition Monitoring, Vol. 57, No. 4, 04.2015, p. 193-199.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Investigation of high-temperature ultrasonic transducer design using lithium niobate piezocomposite

AU - Kirk, K. J.

AU - Hou, R.

AU - Schmarje, N.

AU - Pragada, N. M.

AU - Torbay, L.

AU - Hutson, D.

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AB - The design and fabrication of lithium niobate piezocomposite transducers aims to achieve high-temperature ultrasonic NDT measurements at 400°C. In this paper, three aspects are investigated: exploring design parameters at room temperature by a comparison of experimental and modelled results for lithium niobate piezocomposites with an epoxy matrix; high-temperature electromechanical testing of lithium niobate piezocomposites with a cement matrix; and fabrication and testing of a high-temperature transducer operating at 400°C for defect detection. The piezocomposites were made with a 1-3 structure using a y/36°-cut lithium niobate single-crystal material. The typical piezocomposite thickness was 1 mm, with a pillar width of 0.4-0.8 mm, a kerf width of 0.5 mm, a volume fraction of lithium niobate of 30-40% and a pillar aspect ratio (pillar height to pillar width) ranging from 1 to 6. The operating frequency of the samples was between 1 MHz and 4 MHz. The results of the lithium niobate piezocomposite with an epoxy matrix and pillar aspect ratios of 3, 4 and 6 indicated that a high coupling coefficient kt should be achievable, even with a low pillar aspect ratio. The piezocomposite material was heated in air to 400-500°C over several thermal cycles and showed good stability of the electromechanical impedance spectrum. A 13 x 13 mm2 transducer with an operating frequency of 3 MHz was used to demonstrate the detection of an artificial defect in a steel block using a high-temperature couplant on a hot plate at 400°C.

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JO - Insight - Non-destructive Testing and Condition Monitoring

JF - Insight - Non-destructive Testing and Condition Monitoring

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