B < Sub > 4 < / Sub > C/al Composite Materials Preparation Technology Research

Boron carbide has high hardness （hardness of35to45Gpa, it is second only todiamond and CBN）, low-density （only2.52g/cm³）, chemically inactive and abrasiveresistance. And it has also good neutron absorb ability etc. many advantages.But its toughness is bad, yet aluminium has a lot of advantages, such as texturelight, good toughness and cost low. So B₄C/Al composite materials research causedpeople’s great interest because they have the advantages of B₄C and Al. After years ofresearch, B₄C/Al composite materials have certain application in military affairs,electronic technique and so on.This topic using polymeric sponge impregnation process+pressureless infiltrationtechnology, to explore the process scheme of a novel the preparation B₄C/Al compositematerials:First, this test uses organic foam impregnation process of preparation of porousceramics boron carbide. Second, in test, distilled water as a dissolvant, CMC andbentonite as a rheological agent, Y2O3and Al2O3as a fluxing agent, We have very goodprepared the rheological property of boron carbide ceramics slurry. At the same time,we research the influence of roller spacing, solid concentration etc. on loading slurryamount. Last, the samples, after drying and sintering process, has3rd connectedstructure. And the samples’ gas hole ratio reach81%.The wettability of aluminum on the boron carbide and the temperature ofinfiltration were studied, the results show that with increasing temperature, the wettingangle of aluminum and boron carbide decreases gradually. When the temperature isabove1000℃, the wetting angle is less than90°, and the infiltration effect is good at1200℃. Test show that the wear resistance of the B₄C/Al composite materials comparedwith pure aluminum increased by25to30times and the relative density is98.89%.