The procedure of the determination of yield and ultimate strengths of irradiated 2 1/4 Cr-1 M0 steel using small punch specimen (10 mm by 10 mm by 0.5 mm) has been demonstrated. The result was compared with the result obtained from conventional tensile test. Fracture toughness of irradiated 2 1/4 Cr-1 M0 steel was measured by use of subsized CT specimen and D. C. electrical potential method. Owing to irradiation hardening of 2 1/4 Cr-1 M0 steel, yield and ultimate strength increase substantially and fracture toughness decreases 37 percent when the steel is irradiated to a fluence of 3.2 x 1023 n/m2. The small punch and subsized CT specimen can be used for irradiation test so that considerable irradiation space will be saved.
This paper reports on the study of flexible epoxy resin which lowers modulus to minimize warpage while maintaining high filler content.
Liquid Compression Molding (LCM) material is an encapsulation material applied at the wafer level. LCM requires high reliability and minimized warpage after curing. The flexible epoxy resin was studied to determine if it could be technically feasible to meet the requirements.
Three epoxy resins with different structures, Conventional epoxy, and Flexible epoxy A and B, were examined. Both samples with Flexible epoxy A and B resulted in lower warpage than Conventional resin. Especially, Flexible epoxy B showed the minimal warpage with the lowest modulus. The sample with Epoxy B performs the best at 260 degree Celsius with the minimal warpage.
A reliability test of LCM with Epoxy B was also conducted assuming the application for Fan-out packaging. Epoxy B showed no delamination or cracks under a thermal cycling test up to 1,000 cycles after MSL1 moisture exposure.
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