Bonding material and bonding method
First Claim
1. A bonding material for use in a stepwise bonding process including at least two bonding steps, comprising a dispersion in an organic solvent of composite metallic nano-particles, said composite metallic nano-particles each having such a structure that a metal core of a metal particle having an average particle diameter of not more than 100 nm is combined and coated with an organic material, and said dispersion being in a liquid form.
1 Assignment
0 Petitions
Accused Products
Abstract
There is provided a bonding material and a bonding method which enable lead-free bonding that can replace high-temperature soldering. The bonding material of the present invention comprises a dispersion in an organic solvent of composite metallic nano-particles having such a structure that a metal core of a metal particle having an average particle diameter of not more than 100 nm. The bonding material can be advantageously used in a stepwise bonding process containing at least two bonding steps.
113 Citations
29 Claims
- 1. A bonding material for use in a stepwise bonding process including at least two bonding steps, comprising a dispersion in an organic solvent of composite metallic nano-particles, said composite metallic nano-particles each having such a structure that a metal core of a metal particle having an average particle diameter of not more than 100 nm is combined and coated with an organic material, and said dispersion being in a liquid form.
- 2. A bonding material for use in a stepwise bonding process comprising at least two bonding steps, comprising a dispersion in an organic solvent of composite metallic nano-particles, said composite metallic nano-particles each having such a structure that a metal core of a metal particle having an average particle diameter of not more than 100 nm is combined and coated with an organic material, and said dispersion being in the form of a slurry, paste or cream.
- 3. A bonding material for use in a stepwise bonding process containing at least two bonding steps, comprising a dispersion in an organic solvent of composite metallic nano-particles, said composite metallic nano-particles each having such a structure that a metal core of a metal particle having an average particle diameter of not more than 100 nm is combined and coated with an organic material, and said dispersion being in a solid or jellylike form.
-
8. A bonding method for bonding at least two parts together, comprising:
-
allowing a bonding material to be present between and in contact with predetermined portions of the parts, said bonding material containing as a main bonding material composite metallic nano-particles each having such a structure that a metal core of a metal particle having an average particle diameter of not more than 100 nm is combined and coated with an organic material; and
applying an energy to the bonding material to change the form of the composite metallic nano-particles contained in the bonding material, thereby releasing the organic material from the composite metallic nano-particles and bonding the metal cores together, and the metal core and a surface of said parts. - View Dependent Claims (9, 10, 11, 12)
-
-
13. A bonding material for bonding members together through heating of the bonding material at a bonding temperature (centigrade temperature) or higher and solidification of the bonding material, comprising composite metallic nano-particles each consisting of a metal core composed of a metal, and an organic material which is combined with the metal core and covers it, wherein a temperature (centigrade temperature) at which said bonding material re-melts after the solidification is at least twice higher than said bonding temperature.
-
14. A bonding material for bonding members together through heating of the bonding material at a bonding temperature (centigrade temperature) or higher and sintering of the bonding material, said bonding material being in a solid or material form at room temperature, wherein a temperature (centigrade temperature) at which said bonding material re-melts after the sintering is at least twice higher than said bonding temperature.
-
15. A bonding material for bonding members together through heating of the bonding material at a bonding temperature (centigrade temperature) or higher and solidification of the bonding material, comprising composite metallic nano-particles each consisting of a metal core composed of a metal, and an organic material which is chemically combined with the metal core and covers it, said organic material not containing nitrogen nor sulfur, wherein a temperature (centigrade temperature) at which said bonding material re-melts after the solidification is at least twice higher than said bonding temperature.
-
16. A bonding method comprising:
-
allowing a bonding material to be present between and in contact with at least two parts to be bonded, said bonding material containing composite metallic nano-particles each having such a structure that a metal core of a metal particle having a diameter of 0.5 nm to 100 nm is combined and coated with an organic material;
heating the bonding material at a temperature which is equal to or higher than the decomposition initiating temperature of the organic material, but lower than the melting point of the metal in a bulk state to release the organic material from the metal core of the bonding material present between the parts and sinter the metal core, thereby forming a bulk metal and bonding the parts together to obtain a bonded member;
allowing the same bonding material to be present between and in contact with the bonded member and another member; and
heating the bonding material at a temperature which is equal to or higher than the decomposition initiating temperature of the organic material, but lower then the melting point of the metal in a bulk state to release the organic material from the metal core of the bonding material present between the members and sinter the metal core without melting said bulk metal, thereby bonding the bonded member and another member.
-
-
17. A bonding method comprising:
-
allowing a bonding material to be present between and in contact with at least two parts to be bonded, said bonding material containing composite metallic nano-particles each having such a structure that a metal core of a metal particle having a diameter of 0.5 nm to 100 nm is combined and coated with an organic material, such that the clearance between the parts is 10 to 10,000 times the size of the metal core contained in the bonding material; and
heating the bonding material at a temperature which is equal to or higher than the decomposition initiating temperature of the organic material, but lower than the melting point of the metal in a bulk state to release the organic material from the metal core of the bonding material present between the parts and sinter the metal core, thereby forming a bulk metal and bonding the parts together.
-
-
18. A multi-electrode substrate for bonding of electrodes of the substrate to electrodes of another substrate, comprising a plurality of electrodes and a bonding material that has been applied onto the electrodes, said bonding material containing as a main bonding material composite metallic nano-particles each having such a structure that a metal core having an average diameter of not more than 100 nm is combined and coated with an organic material not containing nitrogen nor sulfur.
-
19. An electrode bonding method comprising:
-
allowing a bonding material to be present between and in contact with electrodes of a substrate and electrodes of another substrate, said bonding material containing as a main bonding material composite metallic nano-particles each having such a structure that a metal core having an average diameter of not more than 100 nm is combined and coated with an organic material not containing nitrogen nor sulfur; and
changing the form of the composite metallic nano-particles contained in the bonding material, thereby bonding said electrodes together.
-
-
20. A bonded structure, comprising at least two members bonded together via a bonding portion, said bonding portion containing a sintered metal portion having a sintered metal structure, said sintered metal portion having been obtained by allowing a bonding material to be present between the members, said bonding material containing as a main bonding material composite metallic nano-particles having a metal core of a metal particle combined and coated with an organic material, and heating or firing the bonding material while holding it at a predetermined position to bond said members together.
- 21. A metallizing apparatus for heating or firing a bonding material comprising a dispersion in a solvent of composite metallic nano-particles having such a structure that a metal core of a metal particle is combined and coated with an organic material to decompose and evaporate the organic material and sinter the metal particles, thereby metallizing the bonding material, comprising an inertial force energy application device for applying an inertial force energy to the bonding material.
-
24. A metallizing apparatus for heating or firing a bonding material comprising a dispersion in a solvent of composite metallic nano-particles having such a structure that a metal core of a metal particle is combined and coated with an organic material to decompose and evaporate the organic material and sinter the metal particles, thereby metallizing the bonding material, comprising:
-
a hermetically closable chamber for housing the bonding material therein; and
a deaerating device for deaerating the interior of the chamber. - View Dependent Claims (25)
-
Specification