Fabrication and inspection of C/Cf-ZrB2-ZrC-SiC and C/Cf-ZrB2-SiC composite parts resistant to ablation by pressureless sintering method

In this research, the aim is to achieve strong and ablation-resistant composite parts C / Cf-ZrB2-ZrC-SiC and C / Cf-ZrB2-SiC by non-pressure sintering method. C / Cf-ZrB2-SiC samples were prepared using synthesized ZrB2 and SiC powders between layers of resin-impregnated carbon fabric. After pressing with pressure 5 times at 1600 وC and heat treatment for 2 hours in a controlled atmosphere furnace under Ar atmosphere. In the next step, C / Cf-ZrB2-ZrC-SiC composite parts were prepared to investigate the effect of ZrC addition and compare it with C / Cf-ZrB2-SiC samples. This was done by synthesizing ZrB2-ZrC-SiC ceramic powder between layers of carbon fabrics using zircon (ZrSiO4), B4C, activated carbon, with or without Si, along with shredded carbon fibers. For this purpose, the prepared powders after wetting and drying along with resin were sprayed between carbon fabrics and the resulting samples were pressed 5 times by cold pressing after 20 layers. After pressing and finding the raw strength, the samples were transferred to a control atmosphere furnace under Ar atmosphere and subjected to heat treatment for 2 hours at 1600 .C. Scanning electron microscopy (SEM) and X-ray analysis (XRD) were used to investigate the microstructural and fuzzy properties of the samples, and the three-point flexural strength test and oxytocin flame were used to investigate the mechanical properties and oxidation resistance of composites. The linear erosion rates of C / Cf-ZrB2-SiC and C / Cf-ZrB2-SiC-ZrC samples in the oxytocin flame abrasion test were 2.16 and 1.74 μm / s, respectively, and the average erosion rates were 3.28. And 2.41 (4-10 g / s *) were measured. Also, the mean density values ​​for C / Cf-ZrB2-SiC and C / Cf-ZrB2-SiC-ZrC samples were 4.67 and 05.03 gr / cm3, respectively, and the flexural strength was 303 and 245 MPa, respectively. .