Gradient ceramic matrix composite material and preparation method thereof

[0041] The embodiment of the present invention provides a preparation method of a gradient ceramic matrix composite material, and the preparation method includes:

[0042] (1) Combine ZrC ceramic powder and ZrB 2 The ceramic powder is mixed uniformly as a solid component, the phenolic resin and PVB resin are mixed uniformly as a liquid component, and the solid component and the liquid component are mixed uniformly to obtain a ceramic slurry;

[0043] (2) uniformly coating the ceramic slurry on at least N kinds of carbon cloths with different areal densities to obtain at least N kinds of prepregs;

[0044] (3) Lay up at least N kinds of prepregs, and then solidify to obtain carbon fiber preforms; wherein, the areal density of each layer of prepregs in the thickness direction of the carbon fiber preforms changes in a gradient, and in each prepreg include at least one layer of prepreg;

[0045] (4) cracking the carbon fiber preform to obtain a porous carbon / carbon intermediate;

[0086] Example 1

[0087] (1) Combine ZrC ceramic powder and ZrB 2 Ceramic powder (both particle size is 200~300nm) is mixed as solid component, phenolic resin and PVB resin (molecular weight 2000~3000g / mol) are mixed as liquid component, solid component and liquid component are mixed according to mass Mixing at a ratio of 20:80 to obtain ceramic slurry;

[0088] Among them, ZrC ceramic powder and ZrB in the solid component 2 The molar ratio of ceramic powder is 1:1; the mass fraction of PVB resin in the liquid component is 30%;

[0089] (2) Choose four areal densities of 240g / cm 2 , 250g / cm 2 , 260g / cm 2 and 270g / cm 2 4 kinds of prepregs (the corresponding mass fractions of ceramic slurry in the prepregs are 61% and 58% respectively) , 55%, 52%);

[0090] (3) The 4 kinds of prepregs are set to 240g / cm according to the carbon cloth surface density 2 , 250g / cm 2 , 260g / cm 2 , 270g / cm 2 , 260g / cm 2 , 250g / cm 2 , 240g / cm 2 Lay-up, then press, u

[0093] Example 2

[0094] Example 2 is basically the same as Example 1, except that:

[0095] In step (1), the mass ratio of solid component and liquid component is 30:70.