Mid-K LTCC compositions and devices

Patent metadata

Field	Value
Publication number	US-9892853-B2
Application number	US-201515301737-A
Country	US
Kind code	B2
Filing date	Jun 12, 2015
Priority date	Jul 9, 2014
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

LTCC devices are produced from dielectric compositions comprising a mixture of precursor materials that, upon firing, forms a dielectric material comprising a matrix of titanates of alkaline earth metals, the matrix doped with at least one selected from rare-earth element, aluminum oxide, silicon oxide and bismuth oxide.

First claim

What is claimed is:

1. A lead-free and cadmium-free dielectric paste composition comprising a solids portion comprising:
from about 15 wt % to about 25 wt % BaO;
from about 0 wt % to about 15 wt % CaO;
from about 0 wt % to about 3 wt % SrO;
from about 0 wt % to about 6 wt % ZnO;
from about 1 wt % to about 15 wt % B 2 O 3 ;
from about 0 wt % to about 30 wt % Al 2 O 3 ;
from about 0 wt % to about 30 wt % SiO 2 ;
from about 3 wt % to about 60 wt % TiO 2 ;
from about 0 wt % to about 17 wt % Bi 2 O 3 ;
from about 0 to about 20 wt % Nd 2 O 3 ;
from about 0 to about 30 wt % Sm 2 O 3 ;
from about 0 to about 3 wt % CuO; and
from about 0 to about 3 wt % LiF.

2. A lead-free and cadmium-free dielectric paste composition comprising a solids portion comprising:
from about 5 wt % to about 40 wt % BaO;
from about 10 wt % to about 60 wt % TiO 2 ;
from about 5 wt % to about 25 wt % Bi 2 O 3 ;
from about 0.1 wt % to about 15 wt % SiO 2 ;
from about 0.1 wt % to about 15 wt % ZnO;
from about 0.1 wt % to about 15 wt % B 2 O 3 ;
from about 0.1 wt % to about 15 wt % CuO; and
from about 0.1 wt % to about 15 wt % LiF.

3. The lead-free and cadmium-free dielectric paste composition of claim 2 , comprising a solids portion comprising:
from about 15 Wt % to about 30 wt % BaO;
from about 40 wt % to about 57 wt % TiO 2 ;
from about 8 wt % to about 18 wt % Bi 2 O 3 ;
from about 0.1 wt % to about 5 wt % SiO 2 ;
from about 0.1 wt % to about 5 wt % ZnO;
from about 0.1 wt % to about 5 wt % B 2 O 3 ;
from about 0.1 wt % to about 5 wt % CuO; and
from about 0.1 wt % to about 5 wt % LiF.

4. A lead-free and cadmium-free dielectric paste composition, comprising a solids portion comprising:
from about 12 wt % to about 18 wt % BaO;
from about 0.1 wt % to about 5 wt % CaO;
from about 0.1 wt % to about 7 wt % ZnO;
from about 0.1 wt % to about 5 wt % B 2 O 3 ;
from about 30 wt % to about 40 wt % TiO 2 ;
from about 8 wt % to about 16 wt % Bi 2 O 3 ;
from about 0 wt % to about 3 wt % CUD; and
from about 0.1 wt % to about 3 wt % LiF.

5. A fired electric or electronic component comprising a lead-free and cadmium-free dielectric paste composition together with
i. a conductive paste comprising prior to firing:
a. 60-90 wt % Ag+Pd+Pt+Au,
b. 1-10 wt % of an additive selected from the group consisting of silicides, carbides, nitrides, and borides of transition metals,
c. 0.5-10 wt % of at least one glass frit,
d. 10-40 wt % of an organic portion,

ii. wherein the lead-free and cadmium-free dielectric paste composition comprises a solids portion comprising:
a. from about 0.5 wt % to about 50 wt % (BaO+CaO+SrO+MgO);
b. from about 0.1 wt % to about 60 wt % (Al 2 O 3 +B 2 O 3 );
c. from about 0.1 wt % to about 60 wt % (SiO 2 +TiO 2 +ZrO 2 );
d. from about 0 wt % to about 40 wt % Bi 2 O 3 ;
e. from about 0 wt % to about 35 wt % (Nd 2 O 3 +Gd 2 O 3 +La 2 O 3 +Sm 2 O 3 );
f. from about 0 wt % to about 10 wt % ZnO;
q. from about 0 wt % to about 10 wt % CuO; and
h. from about 0 wt % to about 8 wt % LiF.

6. The fired electric or electronic component of claim 5 ,
wherein the solids portion comprises:
a. from about 0.5 wt % to about 50 wt % (BaO+CaO+SrO+MgO);
b. from about 0.1 wt % to about 60 wt % (Al 2 O 3 +B 2 O 3 );
c. from about 0.1 wt % to about 60 wt % (SiO 2 +TiO 2 +ZrO 2 );
d. from about 0 wt % to about 40 wt % Bi 2 O 3 ;
e. from about 0 wt % to about 35 wt % (Nd 2 O 3 +Gd 2 O 3 +La 2 O 3 +Sm 2 O 3 );
f. from about 0 wt % to about 10 wt % ZnO;
g. from about 0 wt % to about 10 wt % CuO; and
h. from about 0 wt % to about 8 wt % LiF.

7. A method of producing an LTCC device comprising:
providing at least one substrate bearing a tape comprising a lead-free and cadmium free dielectric paste composition, comprising a solids portion comprising:
from about 0.5 wt % to about 50 wt % (BaO+CaO+SrO+MgO);
from about 0.1 wt % to about 60 wt % (Al 2 O 3 +B 2 O 3 );
from about 0.1 wt % to about 60 wt % (SiO 2 +TiO 2 +ZrO 2 );
from about 0 wt % to about 40 wt % Bi 2 O 3 ;
from about 0 wt % to about 35 wt % (Nd 2 O 3 +Gd 2 O 3 +La 2 O 3 +Sm 2 O 3 );
from about 0 wt % to about 10 wt % ZnO;
from about 0 wt % to about 10 wt % CuO; and
from about 0 wt % to about 8 wt % LiF;

forming at least one via in the tape,
filling the at least one via with a conductive paste comprising:
a. 60-90 wt % Ag+Pd+Pt+Au,
b. 1-10 wt % of an additive selected from the group consisting of silicides, carbides, nitrides, and borides of transition metals,
c. 0.5-10 wt % of at least one glass frit, and
d. 10-40 wt % of an organic portion, and

firing the tape and conductive paste at a temperature up to 1000° C.

8. The fired electric or electronic component of claim 5 , wherein the solids portion comprises:
from about 5 wt % to about 25 wt % (BaO+CaO+SrO+MgO),
from about 0.5 wt % to about 45 wt % (Al 2 O 3 +B 2 O 3 ),
from about 3 wt % to about 58 wt % (SiO 2 +TiO 2 +ZrO 2 ),
from about 1 wt % to about 30 wt % Bi 2 O 3 ,
from about 0 wt % to about 30 wt % (Nd 2 O 3 +Gd 2 O 3 +La 2 O 3 +Sm 2 O 3 ),
from about 0.1 wt % to about 10 wt % ZnO,
from about 0.1 wt % to about 10 wt % CuO, and
from about 0.1 wt % to about 5 wt % LiF.

9. The fired electric or electronic component of claim 5 , wherein the solids portion comprises:
from about 14 wt % to about 25 wt % (BaO+CaO+SrO+MgO),
from about 1 wt % to about 43 wt % (Al 2 O 3 +B 2 O 3 ),
from about 21 wt % to about 58 wt % (SiO 2 +TiO 2 +ZrO 2 ),
from about 8 wt % to about 20 wt % Bi 2 O 3 ,
from about 0.1 wt % to about 20 wt % (Nd 2 O 3 +Gd 2 O 3 +La 2 O 3 +Sm 2 O 3 ),
from about 0.1 wt % to about 5 wt % ZnO,
from about 0.1 wt % to about 5 wt % CuO, and
from about 0.1 wt % to about 3 wt % LiF.

10. A fired electric or electronic component comprising a lead-free and cadmium-free dielectric paste composition together with a conductive paste comprising prior to firing:
a. 60-90 wt % Ag+Pd+Pt+Au,
b. 1-10 wt % of an additive selected from the group consisting of silicides, carbides, nitrides, and borides of transition metals,
c. 0.5-10 wt % of at least one glass frit,
d. 10-40 wt % of an organic portion,

wherein the lead-free and cadmium-free dielectric paste composition comprises a solids portion, comprising:
a. from about 5 wt % to about 50 wt % (BaO+CaO+SrO+MgO),
b. from about 0.1 wt % to about 50 wt % (Al 2 O 3 +B 2 O 3 ),
c. from about 0.1 wt % to about 50 wt % (SiO 2 +TiO 2 +ZrO 2 ), and
d. from about 0.1-40 wt % Bi 2 O 3 .

11. The fired electric or electronic component of claim 10 , wherein the solids portion further comprises at least one selected from the group consisting of:
e. from about 0.1 wt % to about 10 wt % ZnO,
f. from about 0.1 wt % to about 30 wt % (Nd 2 O 3 +Gd 2 O 3 +La 2 O 3 +Sm 2 O 3 ),
g. from about 0.1 wt % to about 10 wt % CuO, and
h. from about 0.1 wt % to about 10 wt % LiF.

12. A fired electric or electronic component comprising a lead-free and cadmium-free dielectric paste composition together with a conductive paste comprising prior to firing:
a. 60-90 wt % Ag+Pd+Pt+Au,
b. 1-10 wt % of an additive selected from the group consisting of silicides, carbides, nitrides, and borides of transition metals,
c. 0.5-10 wt % of at least one glass frit,
d. 10-40 wt % of an organic portion,

wherein the lead-free and cadmium-free dielectric paste composition comprises a solids portion, comprising:
a. from about 0.5 wt % to about 50 wt % BaO,
b. from about 0 wt % to about 40 wt % CaO,
c. from about 0 wt % to about 10 wt % SrO,
d. from about 0 wt % to about 10 wt % ZnO,
e. from about 0.1 wt % to about 20 wt % B 2 O 3 ,

Assignees

• Ferro Corp

Inventors

• Symes Jr Walter J
• Prinzbach Gregory R
• Maloney John J
• Henry James E
• Brown Orville W
• Sridharan Srinivasan
• Her Yie Shein
• Wang Stanley
• Graddy Jr George E
• Sakoske George E

Classifications

• C03C8/18

  containing free metals · CPC title

• C04B35/18

  rich in aluminium oxide · CPC title

• C04B35/4682

  based on BaTiO3 perovskite phase · CPC title

• C04B2235/3208

  Calcium oxide or oxide-forming salts thereof, e.g. lime · CPC title

• C04B35/64

  Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F}) · CPC title