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US 11,141,810 B2Granted
Non-eutectic bonding
AssigneeTechni Holding AS
InventorsAndreas Larsson, Torleif A. Tollefsen
Life of this patent
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Abstract
The present invention relates to a method of forming a joint bonding together two solid objects and joints made by the method, where the joint is formed by a layer of a binary system which upon heat treatment forms a porous, coherent and continuous single solid-solution phase extending across a bonding layer of the joint.
Claims6
A joint between a bonding surface of a first solid object and a bonding surface of a second solid object, comprising
- a bonding layer made of a binary system of components A and B, wherein the binary system is either:
- i) a completely miscible binary system, having an overall composition Co within the range:
- C0=Cliq−fα(Cliq−Cα)
- where;
- Cliq is the composition of a liquid phase coexisting with a single-phased solid solution when the binary system is at a temperature T1=(Tliq,A+Tliq,B)/2,
- Cα is the composition of the single-phased solid solution coexisting with the liquid phase
- when the binary system is at a temperature T1,
- Tliq,A is the liquidus temperature of 100% pure component A,
- Tliq,B is the liquidus temperature of 100% pure component B,
- and
- fα is the fraction of single-phased solid solution present in the miscible binary system at temperature T1, and
- fα is in the range of [0.26, 1), or
- ii) a partly miscible binary system of either hypoeutectic or hypereutectic composition, relative to the binary A-B system, having only three phase fields in its solid state region,
- and if the composition of the partly miscible binary system is hypoeutectic, it has an overall composition C0 in the range:
- C0=Cliq−fα(Cliq−Cα)
- where;
- Cliq is the composition of a liquid phase coexisting with an α-phase when the binary system is at a temperature T1=(Tliq,A+Teut)/2
- Cα is the composition of the α-phase coexisting with the liquid phase when the binary system is at a temperature T1=(Tliq,A+Teut)/2,
- Tliq,A is the melting temperature of 100% pure component A,
- Teut is the eutectic temperature of the eutectic binary system, and
- fα is the fraction of single-phased solid solution present in the miscible binary system at temperature T1, and
- fα is in the range of [0.26, 1),
- or if the composition of the partly miscible binary system is hypereutectic, it has an overall composition C0 in the range:
- Co=fβ(Cβ−Cliq)+Cliq
- where;
- Cliq is the composition of a liquid phase coexisting with an β-phase when the binary system is at a temperature T1=(T1=(Tliq,B+Teut)/2,
- Cβ is the composition of the β-phase coexisting with the liquid phase when the binary system is at a temperature T1=(Tliq,B+Teut)/2,
- Tliq,B is the melting temperature of 100% pure component B,
- Teut is the eutectic temperature of the eutectic binary system, and
- fβ is the fraction of single-phased solid solution present in the miscible binary system at temperature T1, and
- fβ is in the range of [0.26, 1),
- and further wherein
- the binary system of miscible or partly miscible components A and B comprises a porous, coherent and continuous structure of a single-phased solid solution of the A- and B-components being interposed between the bonding surfaces of both the first and second objects, and a second phase of the A- and B-components dispersed in the porous, coherent and continuous structure of the single-phased solid solution of the A- and B-components.
30 more elements
Dependencies are inferred from the claim text.