US3687697A - Glasses for temperature-stable ultrasonic delay lines of low damping characteristics - Google Patents

Glasses for temperature-stable ultrasonic delay lines of low damping characteristics Download PDF

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Publication number
US3687697A
US3687697A US48246A US3687697DA US3687697A US 3687697 A US3687697 A US 3687697A US 48246 A US48246 A US 48246A US 3687697D A US3687697D A US 3687697DA US 3687697 A US3687697 A US 3687697A
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United States
Prior art keywords
glasses
temperature
glass
percent
bao
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Expired - Lifetime
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US48246A
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English (en)
Inventor
Marga Faulstich
Norbert Neuroth
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Schott AG
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Jenaer Glaswerk Schott and Gen
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C4/00—Compositions for glass with special properties
    • C03C4/0057—Compositions for glass with special properties for ultrasonic delay lines glass
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead
    • C03C3/105—Glass compositions containing silica with 40% to 90% silica, by weight containing lead containing aluminium

Definitions

  • compositions for use in delay line assemblies having low temperature coefiicient of propagation time for ultrasonic waves, low mechanical damping, a transformation temperature of about 540600 C., and high acoustical impedance.
  • Preferred compositions in percent by weight are as follows:
  • the total alkali metal oxide amounting to 0.7-1.8%, with the proviso that up to 2 of the wt. percent of BaO may be replaced by CdO, 'SrO, CaO, W0 A1 0 or a mixture of two or more thereof, for stabilization against devitrification.
  • the invention relates to glasses for electromechanical delay lines which have a very low delay time temperature coefiicient. Furthermore, these glasses have a relatively low mechanical damping, so that the intensity of the signal is only slightly attenuated by passing through the delay line.
  • the electrical signal is transformed by a piezoelectric transducer into sound vibrations. These pass through the glass body and at the end of the sound path they are transformed back into electrical vibrations by a second piezoelectric tranducer.
  • T.C. temperature coefiicient of time delay
  • shear waves Two types of sound waves are possible in a solid: longitudinal waves and shear waves. In delay lines shear waves are preferred, because these waves have a lower velocity than longitudinal waves. The frequency, when measured, ranges around 5 megahertz.
  • the velocity of shear waves (v,) is lower in the glasses of the instant invention and the acoustical impedance (A1.) is greater than in the case of the glasses hitherto described for temperature-stable ultrasonic delay lines which have a high softening temperature. Both of these factors represent technical improvements: the lower sound velocity signifies that the glass body can be made smaller, and the greater acoustical impedance means lower reflection losses in the passage of the sound waves from the glass to the transducer.
  • the very low alkali oxide content in the glasses of the invention guards against mechanical after-effects.
  • the glasses of the invention have a small temperature coefficient of propagation time for ultrasonic waves, preferably for shear waves with a frequency of about 5 megahertz, with low mechanical dampening, transformation temperatures of about 540-600 C., and increased acoustical impedance.
  • Preferred compositions are set forth in Table 2.
  • the total alkali metal oxide content amounts to 0.7 to 1.8%.
  • 2% of the BaO can be replaced by other alkali earth (SrO and CaO) or by CdO, W0 or A1 0 without substantially moditying the special properties which are important to the described application of the glass.
  • FIG. 1 is a schematic showing of a delay line assembly
  • FIG. 2 and FIG. 3 show change in delay time versus temperature for compositions of the invention stated infra.
  • a delay line medium 1 is installed in an ultrasonic delay line assembly, which is of conventioual construction.
  • the delay line medium is outfitted with transducers 2 which are connected to imput circuit 3 and output circuit 4.
  • V Sound speed for shear waves, meters per sec 2, 722 2, 733 2, 742 2, 727 2, 730 Density (gJcmfi) 3. 58 3.58 3. 63 3. 57 3. 59
  • A.I. Acoustical impedance
  • compositional ranges of the glasses of the examples consist essentially of:
  • Temperature coeilicient 10 to '60 at 4.4 MHZ., 0.8 to 1.5 X 10- per C.; mechanical. damping in terms of logarithmic decrement at l kilohertz'of about 036x10- to O.43 10- sound speed for' 'shear'waves of 2722 to 2742 meters per second; density. of 3.57 to 3.63 grams/ cmfi; acoustical impedance of 9.74 10 936x10 kg./m. sec.); and a transformation temperature in the range of about 550 to 577 C. i'
  • FIGS. 2 and 3 show the eife-ct 0 I ,tempenature on the delay time in a delay line made from the glasses in the table and providing a 64 microsecond delay.
  • the glasses of the invention are similar in type to known optical and art glasses, and they can be produced by procedures which are conventional for production of such glasses.
  • the batch mixture consists of:
  • the well-mixed batch is continuously fed into a conventional glass melting tanlg melted at about 1440? C. in about 16 hours, refined for about 14 hours, at about 1480- 1500 C. and until it is free of bubbles, and, at a viscosity between 300 and 500 poises (corresponding to temperatures of 1420 to 1360 C.), depending on the throughput, it is poured otf and worked directly into the desired molded objects or bars. In this example, the viscosity at pouring otf is about 6,000 poises.
  • the melt can also be cast in blocks from which the desired objects can afterwards be pressed.
  • the molded objects are annealed in accordance with conventional optical glass practice.
  • the glass can also be produced in any smaller volume desired in platinum crucibles or appropriate ceramic crucibles.
  • BaO may be replaced by CdO, SrO, CaO, W0 A1 0 or a mixture of two or more thereof, for stabilization against devitrification.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
US48246A 1969-06-25 1970-06-22 Glasses for temperature-stable ultrasonic delay lines of low damping characteristics Expired - Lifetime US3687697A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691932135 DE1932135B2 (de) 1969-06-25 1969-06-25 Glaeser fuer temperaturstabile ultraschall verzoegerungs leitungen mit kleiner daempfung

Publications (1)

Publication Number Publication Date
US3687697A true US3687697A (en) 1972-08-29

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ID=5737934

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US48246A Expired - Lifetime US3687697A (en) 1969-06-25 1970-06-22 Glasses for temperature-stable ultrasonic delay lines of low damping characteristics

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US (1) US3687697A (enrdf_load_stackoverflow)
JP (1) JPS4814641B1 (enrdf_load_stackoverflow)
BE (1) BE752213A (enrdf_load_stackoverflow)
CS (1) CS151515B2 (enrdf_load_stackoverflow)
DE (1) DE1932135B2 (enrdf_load_stackoverflow)
FR (1) FR2051333A5 (enrdf_load_stackoverflow)
GB (1) GB1290213A (enrdf_load_stackoverflow)
NL (1) NL7008913A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3783416A (en) * 1969-12-22 1974-01-01 Owens Illinois Inc Solid ultrasonic delay lines and glass compositions therefor
US4123731A (en) * 1976-09-21 1978-10-31 Asahi Glass Company, Ltd. Glass for use in ultrasonic delay lines
US4223286A (en) * 1977-09-05 1980-09-16 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave resonator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49129144U (enrdf_load_stackoverflow) * 1973-03-05 1974-11-06
JPS56157734A (en) * 1980-10-22 1981-12-05 Mitsubishi Electric Corp Cooking utensil

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3783416A (en) * 1969-12-22 1974-01-01 Owens Illinois Inc Solid ultrasonic delay lines and glass compositions therefor
US4123731A (en) * 1976-09-21 1978-10-31 Asahi Glass Company, Ltd. Glass for use in ultrasonic delay lines
US4223286A (en) * 1977-09-05 1980-09-16 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave resonator

Also Published As

Publication number Publication date
GB1290213A (enrdf_load_stackoverflow) 1972-09-20
FR2051333A5 (enrdf_load_stackoverflow) 1971-04-02
CS151515B2 (enrdf_load_stackoverflow) 1973-10-19
DE1932135B2 (de) 1971-06-03
JPS4814641B1 (enrdf_load_stackoverflow) 1973-05-09
DE1932135A1 (de) 1971-01-21
NL7008913A (enrdf_load_stackoverflow) 1970-12-29
BE752213A (fr) 1970-12-01

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