LIDECO Standard Parts 07/2022

E46 subject to alterations Co %  3 1800 1200 1700  6 1650 1500 2300  9 1400 2000 2600  6 1600 2000 2600  9 1450 2350 2700 12 1300 2450 2900 15 1200 2700 2850  6 1400 1900 2250  8 1350 2300 2600 10 1200 2650 2850 SINTERED HARD METAL HIP-DENSIFIED The HIP process (hot isostatic pressing) consists of a special densification treatment of WC – Co – hard metals In this process, which is widely used in hard metal technology, the material is post-compacted under high pressure (1.2-3 kbar) in a high-temperature furnace below the sintering temperature after sintering. This process reduces the residual porosity. The reduction in porosity leads to an improvement in the strength properties and thus to an increase in the service life of the tools for non-cutting shaping. As can be seen from the diagrams and tables, both compressive and flexural strength are improved. For stamping die tooling, hard metal types of medium tungsten particle size, with a cobalt content of 9 to 12%, have been found successful in a wide field of applications. a) influence of crystallite size of hard metal phase left: sintered only right: sintered and HIP-treated). b) Influence of the cobalt content, sample condition as in figure a. Flexural strength sbB of a WC-6Co alloy in the sintered and HIP-treated state as a function of various influencing variables. Porosity in sintered condition: ≥A1 left, not shaded:Sintered condition right, shaded:HIP-treated. Change of Sintered Hard Metal by hot isostatic pressing Tungsten carbide – particle size Hardness HV 30 Flexural Strength N/mm 2 before after before after fine no changes medium coarse