After proper high temperature treatment, the PMI bubble can withstand high -temperature composite material curing technology requirements, so that the PMI bubble has been widely used in the aviation field. The medium -density PMI foam has a good compressed peristaltic performance, which can be cured at the pressure of 120OC -180OC temperature and 0.3-0.5MPa. The PMI bubble can meet the commonly -soaked cubing processing requirements, which can achieve co -ization of the mezzanine structure.

The PMI foam as a aviation material is a uniform rigid closed -hole foam, and the pore size is basically the same. The PMI bubble can also meet the FST requirements. Another feature of the foam expansion structure compared with the NOMEX® honeycomb expiration structure is that it has much better antibody absorption. Because the foam is closed, it is difficult to enter the core of moisture and water. Although the NOMEX® honeycomb mezzanine structure can also be co -cured, it will reduce the intensity of the composite material panel.

In order to prevent the core material of the honeycomb in the process of co-curing, the honeycomb is crushed or sideways, and the curing pressure is usually 0.28-0.35 MPa, rather than 0.69MPa, which is usually compressed. This will cause the pore rate of the composite material panel to be high. In addition, because the pore diameter of the honeycomb structure is large, the skin is supported only in the honeycomb wall position. This will cause fiber to bend and reduce the intensity of the composite leather layer plate.

In summary of the comparison of honeycomb and foam core materials above, it is usually selected as a filling core material for the A -shaped muscular stripe structure. While being used as a core, the structural core material of the A -type bars is used as a structural material. It is also a craft auxiliary material. The PMI foam as the mezzanine structure foam core material has been successfully applied in various aircraft structures. One of the prominent applications is the air inlet side plate at the engine of the tail of the Boeing MD 11 aircraft.

The accurate processing and thermal formation of foam CNC greatly reduced the cost of paving. The high -performance PMI foam core material has a good resistance to compressive peristalsis performance in the process of curing, which compact the panel and eliminate the uneven surface. Compared with the honeycomb core, in the process of firing the heat pressure tank, the pore structure of the same -sex pores of the PMI foam can also meet the requirements of the size stability under the side pressing. Unlike the honeycomb structure, there is no need to fill with foam glue.

In addition, the foam can also evenly pass the pressure of the hot pressure tank to the layer of the plate under the foam to make it compacted, without surface defects such as indentation. Foam filling the structure of the A -type bars can be applied to such as a radar emitting surface, the wall board, the fuselage skin, and the vertical stabilization surface of the engine.