擴散接合(diffusion bonding)是一種元件或材料間之接合方式，利
用同時的加熱與加壓及適當控制時間和其他接合參數，而可將元件或材料
在低於熔點以下相接合。由於接合時，元件或材料均為處於固態下之接合
，故又稱固態接合(solid state bonding)。在接合的過程中，由於不同
材料在熱力性質、物理性質和機械性質各方面上的差異，故在接合時會對
同一接合條件產生不同之反應而影響到接合面之品質，接合參數控制不當
者，甚至會使接合面產生裂縫。由此可知，擴散接合時對於工件之接合參
數的控制，實對接合面性質之好壞影響至大。由於材料在擴散接合後，其
內部或接合面上可能存在著無法避免的缺陷(defects)或孔隙(voids)，當
這些接合件受到外力作用後，此缺陷或孔隙可能會發展成裂紋(cracks)，
而裂紋可能進一步的延伸擴大而造成接合件破裂(fracture)。因此，對於
材料破裂強度的探討就極為重要。本研究內容針對304不銹鋼與鐵-鎳-鈷
kovar合金進行擴散接合與破裂強度之實驗研究，實驗過程經設計使接合
件具有裂縫，利用拉伸試驗以求取相關數值。另外，並對接合件進行破斷
面之SEM 觀察以及界面金相之SEM 觀察，並藉由EPMA成份分析之沿線掃瞄
與元素分佈來觀察元素之擴散與分佈情況。除了希望能藉由比較各實驗結
果找出控制此接合件破裂強度之較佳接合參數外，並希望求出外力、接合
長度與各接合參數的關係，以供後續的研究參考。

Diffusion bonding is a joining method for materials.
Simultaneously heating,pressing and controlling bonding
parameters,we can bond materials under theirmelting points.
Because materials are solids in the bonding process,it is called
solid state bonding.In the bonding process, because of their
differences in thermal, physical and mechanical properties,they
will generate different reaction under the same condition. So it
will affect the properties of welds even though remain many
voids on the welding surface.Therefore,it is very important to
control the bonding parameters.Because of remaining many defects
or voids on the welding surface or inside the weld after
diffusion bonding , they will become cracks when they sustained
external forces.Furthermore,cracks will expand and welds will
fracture.Therefore,it is very important to study the fracture
toughness.In this research,we study diffusion bonding and
fracture toughness about 304 stainless steel to kovar.We design
a crack on the welding surface and use tensile testing to get
corresponding datas.And further,we use SEM to observe fracture
surfaces and welding surfaces. Furthermore,we observe elements
separating in welds according to EPMA.We hope that we can get
the better bonding parameters and relationships between external
force,bonding length and bonding parameters to provide for
researches in the future.