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Capillary Material

 

Alumina Zirconia (AZ) For Standard
Small Precision Tools wire bonding capillaries are formed out of an ultra-pure  Al²O³ fine grade ceramic powder- high-density material for non-fine pitch, and composite ceramic (AZ) material for gold wire bonding or standard and ultra-fine pitch applications. The synthesis of ceramic microstructures such as purity, particle size, distribution, reactivity, and polymorphic form influences the final mechanical property and geometry of the wire-bonding capillary. Packaging technology’s driven goal to reduce the chip size to handle more I/O- has pushed the physical and material properties at the threshold of its critical design limitations. Re-engineering is absolutely necessary for the ceramic wire bonding capillaries to cater for tighter bond pad pitch of less than 60µm, where smaller tip diameter design is needed.

SPT Denomination   AZ
Density g/cm3
 
4.25
Color    White  
Hardness  HV 1
 
2060  
Grain Size µm < 0.9
Composition   Al2O3 + ZrO2
Composition  
    Polished and Etched cross-section Fracture


Alumina Zirconia Ruby (AZR)
The conversion of gold-to-copper wire has been successfully implemented from simple to complex device-package combinations for leaded (e.g. SOIC, QFP, QFN) and laminates, ranging from low-to-high pin counts. Embracing the economic benefits of using copper wire interconnect to compete in the electronic consumer driven market, the semiconductor assembly companies are constantly searching for methods to reduce the cost of ownership, and one of which is through cost per number of touchdowns from the capillary.

SPT Denomination   AZR
Density g/cm3
 
4.25
Color   Pink 
Hardness  HV 1
 
2100  
Grain Size µm  < 0.9
Composition   Al2O3 + ZrO2 + Cr2O3


The AZR microstructure (Figure 1) is made of high purity, fine-grained homogenous Alumina Zirconia with Chromium Oxide totally dissolved in the matrix, a highly dense material with excellent hardness, which is most suitable for rugged metallization terrain used for copper bonding application.

The AZR mechanical properties were further enhanced using SPT’s proprietary state-of-the-art thermal treatment process to ensure high material strength, by elimination of porosity through a combination of high pressure and exact sintering temperature.

 
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