US5407871A — Glass-ceramic composite

Claim 1

Independent Claim 96 words

A glass-ceramic composite consisting essentially of crystallized glass and a ceramic containing at least one of alumina and mullite at the ratio by weight of eighty through fifty-five to twenty through forty-five, said glass containing 40 to 52 percent by weight of SiO 2 , 27 to 37 percent by weight of Al 2 O 3 , 11 to 13 percent by weight of MgO, 2 to 8 percent by weight of B 2 O 3 , 2 to 8 percent by weight of CaO, and 0.1 to 3 percent by weight of ZrO 2 .

Claim 2

Dependent Claim 96 words

A glass-ceramic composite consisting essentially of crystallized glass and a ceramic containing at least one of alumina and mullite at the ratio by weight of eighty through fifty-five to twenty through forty-five, said glass containing 40 to 52 percent by weight of SiO 2 , 27 to 37 percent by weight of Al 2 O 3 , 11 to 13 percent by weight of MgO, 2 to 8 percent by weight of B 2 O 3 , 2 to 8 percent by weight of CaO, and 0.1 to 3 percent by weight of ZrO 2 .

Claim 3

Dependent Claim 24 words

A glass-ceramic composite as in claim 1 wherein said ceramic consists of one selected from the group consisting of alumina, mullite, and mixtures thereof.

Claim 4

Dependent Claim 17 words

A glass-ceramic composite as in claim 1 wherein, said glass-ceramic composite is applicable for integrated circuit package.

Claim 5

Dependent Claim 21 words

A glass-ceramic composite as in claim 1 wherein, said glass-ceramic is applicable to multilayer substrates and allows wiring of fine pitches.

Claim 6

Dependent Claim 16 words

A glass-ceramic composite as in claim 2, wherein said alumina has purity of 99.9% or more.

Claim 7

Dependent Claim 16 words

A glass-ceramic composite as in claim 2, wherein said mullite has purity of 99.9% or more.

Claim 8

Dependent Claim 91 words

A glass-ceramic composite consisting essentially of crystallized glass and a ceramic containing at least one of alumina and mullite at the ratio by weight of eighty through fifty-five to twenty through forty-five, said crystallized glass comprising cordierite as primary crystals and contains 40 to 52 percent by weight of SiO 2 , 27 to 37 percent by weight of Al 2 O 3 , 11 to 13 percent by weight of MgO, 2 to 8 percent by weight of CaO, and 0.1 to 3 percent by weight of ZrO 2 .

Claim 9

Dependent Claim 91 words

A glass-ceramic composite consisting essentially of crystallized glass and a ceramic containing at least one of alumina and mullite at the ratio by weight of eighty through fifty-five to twenty through forty-five, said crystallized glass comprising cordierite as primary crystals and contains 40 to 52 percent by weight of SiO 2 , 27 to 37 percent by weight of Al 2 O 3 , 11 to 13 percent by weight of MgO, 2 to 8 percent by weight of CaO, and 0.1 to 3 percent by weight of ZrO 2 .

Claim 10

Dependent Claim 24 words

A glass-ceramic composite as in claim 7, wherein said ceramic consists of one selected from the group consisting of alumina, mullite, and mixtures thereof.

Claim 11

Dependent Claim 100 words

A glass-ceramic composite with large insulating property consisting essentially of crystallized glass and a ceramic containing at least one of alumina and mullite at the ratio by weight of eighty through fifty-five to twenty through forty-five, said glass containing 40 to 52 percent by weight of SiO 2 , 27 to 37 percent by weight of Al 2 O 3 , 11 to 13 percent by weight of MgO, 2 to 8 percent by weight of B 2 O 3 , 2 to 8 percent by weight of CaO, and 0.1 to 3 percent by weight of ZrO 2 .

Claim 12

Dependent Claim 100 words

A glass-ceramic composite with large insulating property consisting essentially of crystallized glass and a ceramic containing at least one of alumina and mullite at the ratio by weight of eighty through fifty-five to twenty through forty-five, said glass containing 40 to 52 percent by weight of SiO 2 , 27 to 37 percent by weight of Al 2 O 3 , 11 to 13 percent by weight of MgO, 2 to 8 percent by weight of B 2 O 3 , 2 to 8 percent by weight of CaO, and 0.1 to 3 percent by weight of ZrO 2 .

Claim 13

Dependent Claim 106 words

A glass-ceramic composite with high strength, high thermal expansion coefficient, and low permittivity consisting essentially of crystallized glass and a ceramic containing at least one of alumina and mullite at the ratio by weight of eighty through fifty-five to twenty through forty-five, said glass containing 40 to 52 percent by weight of SiO 2 , 27 to 37 percent by weight of Al 2 O 3 , 11 to 13 percent by weight of MgO, 2 to 8 percent by weight of B 2 O 3 , 2 to 8 percent by weight of CaO, and 0.1 to 3 percent by weight of ZrO 2 .

Claim 14

Dependent Claim 106 words

A glass-ceramic composite with high strength, high thermal expansion coefficient, and low permittivity consisting essentially of crystallized glass and a ceramic containing at least one of alumina and mullite at the ratio by weight of eighty through fifty-five to twenty through forty-five, said glass containing 40 to 52 percent by weight of SiO 2 , 27 to 37 percent by weight of Al 2 O 3 , 11 to 13 percent by weight of MgO, 2 to 8 percent by weight of B 2 O 3 , 2 to 8 percent by weight of CaO, and 0.1 to 3 percent by weight of ZrO 2 .

Claim 15

Dependent Claim 106 words

A glass-ceramic composite with dense surface, no water absorbing capacity, and high strength consisting essentially of crystallized glass and a ceramic containing at least one of alumina and mullite at the ratio by weight of eighty through fifty-five to twenty through forty-five, said glass containing 40 to 52 percent by weight of SiO 2 , 27 to 37 percent by weight of Al 2 O 3 , 11 to 13 percent by weight of MgO, 2 to 8 percent by weight of B 2 O 3 , 2 to 8 percent by weight of CaO, and 0.1 to 3 percent by weight of ZrO 2 .

Claim 16

Dependent Claim 106 words

A glass-ceramic composite with dense surface, no water absorbing capacity, and high strength consisting essentially of crystallized glass and a ceramic containing at least one of alumina and mullite at the ratio by weight of eighty through fifty-five to twenty through forty-five, said glass containing 40 to 52 percent by weight of SiO 2 , 27 to 37 percent by weight of Al 2 O 3 , 11 to 13 percent by weight of MgO, 2 to 8 percent by weight of B 2 O 3 , 2 to 8 percent by weight of CaO, and 0.1 to 3 percent by weight of ZrO 2 .

Claim 17

Dependent Claim 218 words

Method for making a glass-ceramic composite consisting essentially of crystallized glass and a ceramic selected from the group consisting of alumina and mullite, said crystallized glass comprising cordierite as primary crystals and containing 40 to 52 percent by weight of SiO 2 , 27 to 37 percent by weight of Al 2 O 3 , 11 to 13 percent by weight of MgO, 2 to 8 percent by weight of B 2 O 3 , 2 to 8 percent by weight of CaO, and 0.1 to 3 percent by weight of ZrO 2 , said method comprising the steps of: (a) weighing and mixing CaCO 3 , Al(OH) 3 , SiO 2 , MgCO 3 , H 3 BO 3 , and ZrO 2 ; (b) melting the mixture of step (a) in a platinum or alumina crucible at a temperature of 1,400° C. to 1,500° C.; (c) dropping the molten mixture of step (b) into water to form frit; (d) crushing the frit of step (c) to glass powder; (e) mixing said glass powder of step (d) with alumina or mullite powder at the ratio of 80 through 55 to 20 through 45; (f) molding the mixture of step (e); and (g) firing the molded body of step (f) at temperature of 900° C. to 1,000° C.

Claim 18

Dependent Claim 218 words

Method for making a glass-ceramic composite consisting essentially of crystallized glass and a ceramic selected from the group consisting of alumina and mullite, said crystallized glass comprising cordierite as primary crystals and containing 40 to 52 percent by weight of SiO 2 , 27 to 37 percent by weight of Al 2 O 3 , 11 to 13 percent by weight of MgO, 2 to 8 percent by weight of B 2 O 3 , 2 to 8 percent by weight of CaO, and 0.1 to 3 percent by weight of ZrO 2 , said method comprising the steps of: (a) weighing and mixing CaCO 3 , Al(OH) 3 , SiO 2 , MgCO 3 , H 3 BO 3 , and ZrO 2 ; (b) melting the mixture of step (a) in a platinum or alumina crucible at a temperature of 1,400° C. to 1,500° C.; (c) dropping the molten mixture of step (b) into water to form frit; (d) crushing the frit of step (c) to glass powder; (e) mixing said glass powder of step (d) with alumina or mullite powder at the ratio of 80 through 55 to 20 through 45; (f) molding the mixture of step (e); and (g) firing the molded body of step (f) at temperature of 900° C. to 1,000° C.

Claim 19

Dependent Claim 26 words

Method for making a glass-ceramic composite as in claim 12, wherein said firing of said step (g) is conducted at a speed of about 180° C./hour.

Claim 20

Dependent Claim 41 words

Method for making a glass-ceramic composite as in claim 12, wherein said glass powder of step (d) has the average grain diameter of not greater than 3 micrometer and the specific surface area of not less than 4 m 2 /g.

Claim 21

Dependent Claim 23 words

Method for making a glass-ceramic composite as in claim 12, wherein said frit of step (c) is crushed with an alumina ball mill.

Claim 22

Dependent Claim 22 words

Method for making a glass-ceramic composite as in claim 12, wherein said alumina of step (e) has purity of 99.9% or more.

Claim 23

Dependent Claim 22 words

Method for making a glass-ceramic composite as in claim 12, wherein said mullite of step (e) has purity of 99.9% or more.

Claim 24

Dependent Claim 23 words

Method for making a glass-ceramic composite as in claim 12, wherein said mixture of step (e) is molded by the green sheet method.

Claim 25

Dependent Claim 18 words

Method for making a glass-ceramic composite as in claim 12, wherein said mixture of step (e) is press-molded.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1998-04-17	1998-10-17	1999-04-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2002-04-17	2002-10-17	2003-04-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2006-04-17	2006-10-17	2007-04-18	$7700.00	Window Closed / Lapsed

Glass-ceramic composite

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