By Sharon Rosenberg, Kathleen Meade
With either cookbook-style examples and in-depth verification heritage, beginner and professional verification engineers will locate details to ease their adoption of this rising Accellera regular.
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Extra resources for A Practical Guide to Adopting the Universal Verification Methodology (UVM)
45% C) agree well with theoretical curves showing the concentration distribution of alloying elements in the direction of diffusion in infinite space. The plots constructed from measurements are shown in Fig. 2-15. The data presented in this figure and also in Table 2-6 give an idea about the extent of the diffusion zone which varies with the chemical composition of the specimens, bonding temperature, holding time, and bonding pressure. The shaded areas between the joint line and the hardness plot in the bond zone are about the same in size.
1) The mating surfaces must be thoroughly cleaned and a direct contact between them ensured. (2) The materials should be heated to a temperature promoting diffusion across the mating surfaces over a specified time interval. (3) The atmosphere around the joint should shield the material against oxidation or contamination or both. 2 PROCEDURES OF DIFFUSION BONDING 61 mosphere is built up in the chamber, the pieces are heated to the specified temperature, a pressing load is applied, and the pieces are held compressed for a specified time interval.
Along the bond line there can be seen oval tungsten carbide grains produced by diffusion and differing from the interlayer material, the cemented carbide and the steel pieces. As comparative tests have shown, the shear strength of a diffusion bond between a cemented carbide and a steel piece with no interlayer is 172 MPa, with an interlayer of powdered nickel, up to 260 MPa. In the diffusion bonding of 18X2H4BA steel to BK20 tungsten carbide-cobalt alloy with a nickel foil interlayer (at T = 1 323 K, pb = 10 MPa, and / = 10 min), the boundary diffusion of some nickel into the steel produces a wedge-shaped expansion of the grain boundaries on the steel side.
A Practical Guide to Adopting the Universal Verification Methodology (UVM) by Sharon Rosenberg, Kathleen Meade