US3857713A - Alkali free lead silicate glass medium for ultrasonic delay lines - Google Patents

Alkali free lead silicate glass medium for ultrasonic delay lines Download PDF

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Publication number
US3857713A
US3857713A US00264338A US26433872A US3857713A US 3857713 A US3857713 A US 3857713A US 00264338 A US00264338 A US 00264338A US 26433872 A US26433872 A US 26433872A US 3857713 A US3857713 A US 3857713A
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US
United States
Prior art keywords
percent
glass
amount
glass medium
pbo
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00264338A
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English (en)
Inventor
T Inamura
K Sawamoto
Y Nakata
N Niizeki
M Tsunekawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Labor Of Nippon Telegraphy & Telephone Public Corp ja
Of Nippon Telegraphy & Telepho
OHI KOJYO OF NIPPON KOGAKU KK
OHI KOJYO OF NIPPON KOGAKU KK JA
Nikon Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Of Nippon Telegraphy & Telepho
OHI KOJYO OF NIPPON KOGAKU KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP6418869A external-priority patent/JPS4814163B1/ja
Priority to FR7030057A priority Critical patent/FR2068888A5/fr
Priority to GB3931370A priority patent/GB1318075A/en
Priority to DE2040517A priority patent/DE2040517C3/de
Application filed by Of Nippon Telegraphy & Telepho, OHI KOJYO OF NIPPON KOGAKU KK filed Critical Of Nippon Telegraphy & Telepho
Priority to US00264338A priority patent/US3857713A/en
Application granted granted Critical
Publication of US3857713A publication Critical patent/US3857713A/en
Assigned to NIPPON TELEGRAPH & TELEPHONE CORPORATION reassignment NIPPON TELEGRAPH & TELEPHONE CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 07/12/1985 Assignors: NIPPON TELEGRAPH AND TELEPHONE PUBLIC CORPORATION
Assigned to NIKON CORPORATION, 2-3, MARUNOUCHI 3-CHOME, CHIYODA-KU, TOKYO, JAPAN reassignment NIKON CORPORATION, 2-3, MARUNOUCHI 3-CHOME, CHIYODA-KU, TOKYO, JAPAN CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE APR. 1, 1988 Assignors: NIPPON KOGAKU, K.K.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
    • 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
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • 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
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/07—Glass compositions containing silica with less than 40% 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
    • C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
    • C03C3/112—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine
    • 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

Definitions

  • ABSTRACT A glass medium suitable for ultrasonic delay lines employs a composition which consists essentially of 36 to 46 percent of SiO 35 to 60 percent of PhD, 0 to 20 percent of AlF and 0 to 10 percent of BaF the total content of .the A11 and BaF being present in a range of 2 to 20 percent, the percentage being by weight.
  • the present invention relates to a glass medium for ultrasonic delay lines having improved acoustic properties.
  • an ultrasonic delay line consists of a medium through which acoustic waves are propagated, an input transducer fixed to a suitable portion of the medium for converting electrical signals into mechanical signals and an output transducer for converting the mechanical signals again into electrical signals.
  • the most important factors of a medium used as a delay line are that the delay time will not be varied by temperature variation, that the attenuation of the propagated acoustic wave be minimal, and that the aging also be minimal. Glasses as ultrasonic media are required to meet severe conditions for such special uses. For example, when a glass is used as a delay line in a PAL color television receiver, the variation in delay time together with the aging must be within :80 ppm.
  • the attentuation is preferred to be less than X 10 db/ cycle when measured with a frequency higher than 1 MHZ.
  • a fused silica which has been used widely as a delay line has a temperature coefficient (a ratio of variation of delay time to a temperature rise of 1C) of
  • FIG. 1 is a schematic illustration of a bar-shaped ultrasonic delay line
  • FIG. 2 is a graph illustrating the composition of a glass in accordance with the present invention.
  • FIG. 3 is a graph illustrating rate of variation of delay time due to aging.
  • FIG. 4 is a graph illustrating the rate of variation of delay time due to temperature variation.
  • FIG. 1 shows a common and simple form of delay line consisting of a delay line medium 2 in the form of a bar and input and output transducers l and 3 fixed to the ends thereof.
  • the shear waves of the me chanical signals converted by the input transducer 1 propagate through the medium 2 and are converted again into the electrical signals by the output transducer 3.
  • the delay time is the time for the acoustic wave to propagate through the medium 2 between the input and output transducers land 3.
  • FIG. 2 is a graph illustrating the composition range of a glass composition in accordance with the present invention.
  • the glass consists of 36 46 percent by Hal
  • the glasses available on the market weight of Stow 35 60 percent by weight of Pbo, 0 have a temperature coefficient from 10 ppm/C to 50 20 percent by weight of AiFa and 0 10 percent by C and agmg 100 F. to 1000 weight of BaF
  • the total content of the AIF and Ba] which depending upon their compositions represent a is present in the range of 2 to 20 percent by weight. wide variation.
  • Conventional glasses do not possess the when th6 fluoride content is Smaller than th above properties to permit their satisfactory use as delay lines. mentioned range, the viscosity of the fused glass iS 7 creased, and unresolved SiO tends to remain so that it is difficult to attain a high degree of homogenization.
  • the fluoride content be higher than 2 percent by weight. From the standpoint It therefore. the pnmary f of the present of stability, the fluoride content is preferably less than vention to provide a glass composition to be used as a 20 percent by weight.
  • the contents of Pbo and sioz m which el'minate.s.the defects .encoumered are somewhat different depending upon the contents with prior art glass compositions, and which possesses and types of fluorides, but a glass having a temperature satisfactory properties as a delay line.
  • the temperature coefficient in the range of to +5ppm/oC may be coefficient is in the range of 5 to +5 ppm/0C the tained by the contents of 36 46 percent by weight of tenuafio'n is less than 10 X 10-3 lb/cycle h F SiO and 35 60 percent by weight of PhD.
  • the attenu- Sured 3 frequency of 5 agmg ation of the glass of the invention is less than 10 X l0 most zero.
  • Another advantage resides in the fact that db/cycie when measured with a frequency higher than glass compositions in accordance with the present in- 1 MHZ and the aging of deiay time iS less than 50 ppm vention may be Produced in a considerablytshorter by an accelerated aging test in' which the glass is subnealing time as compared to the time required to crizd to a Strain of 10-6 at with an aitematiiig cute prior art delay line glass.
  • aging is minicurrent f 1 m ZBd- Since the glass of this invention contains a lead oxide,
  • the Viscosity and the melting p the velocity of shear wave may be small so that the diture of molten glass made in accordance with the inmensions of the glass may be made smaller compared vention are lower because the glass contains fluorides, ith th prior n l ss, whereby melting and forming of the glass are greatly
  • the table below shows the compositions, of the Ex facilitated. amples and their acoustic characteristics:
  • the attenuation of each of the Examples was less than prepared by the following process.
  • a glass batch (total 10 X 10 db/cycle and the aging in years was less than 50 ppm as shown in FIG. 3.
  • the temperature variations for Examples 1 and 3 are shown in FIG. 4.
  • Aging tests were made at 50C under a continuous strain of 10 by an alternating current of SMHz.
  • the density of each glass was about 4g/cm
  • control of temperature and time are not critical and the acoustic properties of the glass of the present invention will not vary though the control of conditions of temperature and time may vary.
  • Example 1 consisting of 40.0 percent by weight of SiO 56.0 percent by weight of PbO and 4.0 percent by weight of AlF the temperature coefficient, attenuation and aging remained almost unchanged even when the annealing temperature was changed from 1C/Hr. to 30C/Hr., with a decrease in velocity of only 0.5 percent.
  • the viscosity of the molten glass of the invention is reduced because the glass contains fluorides.
  • the melting temperature of the glass of the invention is lower by 50 150C than the melting temperature of the prior art glass containing only oxides. Thus the glass melting conditions are much improved.
  • the raw materials of the glass in accordance with the present invention may be mixed in the conventional manner and melted in a clay pot or platinum crucible at a temperature from 1,200 to 1,350C.
  • the fused glass may be formed by the conventional method.
  • the continuous flow or tank furance method may, of course, be employed.
  • a refining agent such as Sb O A5 0 etc.
  • glass in accordance with Example 1 is amount about 200.0 kg) comprising 80.0 kg of SiO 108.74 kg of PbO, 8.1 kg of AIR, and 1.0 kg of Sb O is well mixed by a known method, and the mixture is heated at 1,350C for 5 hours in a clay crucible. The molten glass is stirred for 15 minutes under 40 revolutions per minute. Then the molten mixture is cooled to a temperature suitable for casting. The cooled, molten glass is thrown in a cast, and annealed to room temperature at an annealing rate 1.5C/hr.
  • Glass made in accordance with the present invention has satisfactory properties for ultrasonic delay lines and may be produced in a simple manner.
  • a glass medium for ultrasonic line having the range of 5 to +5 ppm/C of the temperature coefficient of delay time, attenuation of less than approximately 10 X 10' db/cycle at a frequency higher than 1 MH and aging of delay time ofless than 50 ppm, the glass medium being devoid of an alkali ion and consisting essentially of, by weight, 36 to 46 percent of SiO 35 to 60 percent of PbO, 0 to 20 percent of AlF and O 10 percent of BaF the total content of the AlF and BaF being present in a range of 2 to 20 percent.

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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)
US00264338A 1969-08-15 1972-06-19 Alkali free lead silicate glass medium for ultrasonic delay lines Expired - Lifetime US3857713A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR7030057A FR2068888A5 (de) 1969-08-15 1970-08-14
GB3931370A GB1318075A (en) 1969-08-15 1970-08-14 Glass medium for ultrasonic delay lines
DE2040517A DE2040517C3 (de) 1969-08-15 1970-08-14 Glas für Ultraschallverzögerungsleitungen, das gute Temperaturkonstanz (weniger als S ppm/ Grad C), geringe Dämpfung (weniger als 10 mal 10 hoch -3 db/Zyklus bei 5 Mhz) und ausgezeichnete Alterungsbeständigkeit aufweist
US00264338A US3857713A (en) 1969-08-15 1972-06-19 Alkali free lead silicate glass medium for ultrasonic delay lines

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP6418869A JPS4814163B1 (de) 1969-08-15 1969-08-15
US6319470A 1970-08-11 1970-08-11
US00264338A US3857713A (en) 1969-08-15 1972-06-19 Alkali free lead silicate glass medium for ultrasonic delay lines

Publications (1)

Publication Number Publication Date
US3857713A true US3857713A (en) 1974-12-31

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US00264338A Expired - Lifetime US3857713A (en) 1969-08-15 1972-06-19 Alkali free lead silicate glass medium for ultrasonic delay lines

Country Status (4)

Country Link
US (1) US3857713A (de)
DE (1) DE2040517C3 (de)
FR (1) FR2068888A5 (de)
GB (1) GB1318075A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2742539A1 (de) * 1976-09-21 1978-03-23 Asahi Glass Co Ltd Glas fuer ultraschallverzoegerungsleitungen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120232A (en) * 1982-05-17 1983-11-30 Galileo Electro Optics Corp Glass composition

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1118422A (en) * 1965-04-15 1968-07-03 Philips Electronic Associated Improvements relating to acoustic delay lines
FR2005676A1 (de) * 1968-04-05 1969-12-12 Nippon Telegraph & Telephone
US3598619A (en) * 1968-04-09 1971-08-10 Matsushita Electric Ind Co Ltd Glass ultrasonic delay line

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1118422A (en) * 1965-04-15 1968-07-03 Philips Electronic Associated Improvements relating to acoustic delay lines
FR2005676A1 (de) * 1968-04-05 1969-12-12 Nippon Telegraph & Telephone
US3598619A (en) * 1968-04-09 1971-08-10 Matsushita Electric Ind Co Ltd Glass ultrasonic delay line

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2742539A1 (de) * 1976-09-21 1978-03-23 Asahi Glass Co Ltd Glas fuer ultraschallverzoegerungsleitungen
US4123731A (en) * 1976-09-21 1978-10-31 Asahi Glass Company, Ltd. Glass for use in ultrasonic delay lines

Also Published As

Publication number Publication date
DE2040517B2 (de) 1974-10-03
FR2068888A5 (de) 1971-09-03
GB1318075A (en) 1973-05-23
DE2040517A1 (de) 1971-02-18
DE2040517C3 (de) 1975-06-05

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AS Assignment

Owner name: NIPPON TELEGRAPH & TELEPHONE CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:NIPPON TELEGRAPH AND TELEPHONE PUBLIC CORPORATION;REEL/FRAME:004454/0001

Effective date: 19850718

AS Assignment

Owner name: NIKON CORPORATION, 2-3, MARUNOUCHI 3-CHOME, CHIYOD

Free format text: CHANGE OF NAME;ASSIGNOR:NIPPON KOGAKU, K.K.;REEL/FRAME:004935/0584