The porosity casting defects in aluminum

The database was developed pyrolysis pattern property using the pyrolysis Pattern apparatus. The database for materials currently used pattern covered in detail in REPORT NO. 527985-2004 – Project Final Report submitted by DOE CONTRACT N0. DE-FC07-99ID13840. The data include gas fraction, liquid fraction, energy consumption, and pressure for different velocities, foam densities and temperatures. This was considered to be complete database; However, further evaluations were performed on patterns with different levels of three types of additives in the current program. Was meant to focus the effort to maximize the effect of different amounts of additives reduce the molecular weight of patterns.

It was intended to properties of data that GM could use the code provided. Given that the pyrolysis Pattern apparatus was idle for hours entended (2001 to 2005) the device was inspected and recalibrated. Experiments were expanded polystyrene (EPS) of 0.75 bars. Wide, 1.5 in. Tall, and 20 to 24 in. Long to about 1.4 PCF density. The bars were modeled using three types of add-ons developed by GM R & D (GM Research and Development Center) (see Table 1.2.1) and two levels of molecular weight. Add bromide used in producing beads functions to reduce the molecular weight more rapidly during heating, hence the viscosity of the liquid pyrolysis products are moved to the shield more quickly. Experience has shown that plug foundry bromide in the amount of 0.36% significantly reduced times and defects in aluminum casting porosity.

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