| 摘要 |
<p>Improvements in processing metal matrix composite materials by infiltration are disclosed. Specifically, a permeable mass comprising a preform or bedding material is provided to an infiltration setup in addition to that being the objective of the infiltration. The additional preform or bed is itself infiltrated at least at some point during processing to produce an additional, e.g., 'sacrificial' MMC body. This sacrificial MMC reduces the amount that the carcass of matrix metal may shrink during cooling which in turn reduces the stress on and warping induced in the objective preform. The second or additional bed or preform is termed a 'sacrificial' bed or sacrificial preform. The sacrificial bed or preform may be disposed between the object preform and the body of matrix metal, or opposite the body of matrix metal from the object preform, or both. The sacrificial MMC may be reused in subsequent infiltration setups to produce additional infiltrations of objective preforms. Further, a separation facilitator may be disposed between the objective preform and the sacrificial bedding/preform/MMC to assist in the recovery of the desired MMC body following infiltration and solidification of matrix metal.</p> |
