The throat material now is made from carbon carbon composite material,and the main material is 4D C/C, the acupuncture and puncture knitting process is the main direction. The throat is one of the most important parts of the engine,and the throat material must meet the technology requirement of the missile engine.
The material of the missile throat used to made from polycrystalline graphite, re-crystallized graphite,pyrolytic graphite etc. now the carbon carbon composite material is used for this parts.
Carbon carbon composite material is made from carbon fiber and carbon matrix material,it’s more strengthful than graphite material, thermal shock resistance property is better than graphite material,and it can be designed. Now the carbon carbon composite material has become the most appropriate material of the throat. C/C preform material has 2D,3D 4D,5D,7D even 11D, polar weave etc.and the 4D is widely used for many military products,such as : tomahawk cruise missile, anti submarine missile, anti tank missile etc.
The structure of the perform is also important to the carbon carbon composite material performance, the acupuncture and puncture knitting process can meet the high strength in the axial,and can meet mass production. Mmulti dimensional braided perform is not easy to make ,it need manual molding, complex process,expensive cost.
acupuncture and puncture knitting process have more fiber content than the whole felt,and compared with the weave C/C material,the process is more simple. And it’s more convenient to densify with CVI and easy to mass production in this way,so the cost will decrease.
In the future, the 4D acupuncture and puncture will be used mostly for the missile throat. It can improve the fiber content, mechanical properties and reduce the cost and make the mass production come true.