High-temperature synthesis of corundum and boron carbide ceramics was performed and the physical and chemical indicators of the obtained products were determined. Their suitability as a components of individual protection systems is assessed by ballistic tests.
The results of research coatings coatings obtained after complex saturation boron and silicon in the powder environment on steel 45. Determine the thickness and microhardness of the resulting coatings, their phase and chemical composition. It has been established that the coatings obtained after complex saturation boron and silicon more plastic and have a 1.8 times higher fracture toughness (K1c) and 1.5 times higher than the wear resistance as compared with coatings obtained by borating.
Investigated the wear resistance of coatings obtained by saturation with boron and copper under dry friction – sliding on the air, and found that the coatings obtained by saturation with boron and copper have 2 times better wear resistance than the coating after boriding. Found that the saturation of boron and copper complex provides optimal performance when wear boride phases, namely sufficient microhardness – 15.5 MPa, 0,5 0,5 low porosity, increase in viscosity layer, the value K reaches 2.1 MPa · m to compared with 1.2 MPa · m 1C without complex saturation and increasing stress chipping values to 290 MPa compared to 170 MPa for the boride layers.
The results of studies on the application of complex boron coating powder method on hard alloys. Defined phase and chemical composition, thickness and microhardness of the coating on alloys.
It was established that after diffusion saturation of hard alloy in boron mixture for 4 hours formed coating with boride phases TiB, WB, CoB and WC, TiC, whose thickness is 50-60 microns. At complex saturation with boron and copper for 4 hours diffusion saturation formed coating with boride phases TiB, WB, CoB and WC, TiC and separate inclusions of copper with a thickness of the diffusion layer up to 70-80 microns.
Boriding and complex saturation with boron and copper allows in 2 – 2.5 times increase the microhardness of the surface layers of hard alloys, that in turn leads to increased wear resistance.
In this study boron carbide based sandblasting nozzles were produced by Low Pressure Powder Injection Molding (LPPIM) method, and wear behaviors of the nozzles were examined. The addition powder, addition ratio and sintering temperature were used as input parameters while density, micro hardness and wear rate were used as output parameters in the experimental design. This study consists of 3 steps: 1) production of standard samples and characterization, 2) modeling of proses parameters using Artificial Neural Network (ANN) method, 3) selection of nozzle material and production of nozzle, and testing. As a results of this study, ANN method can be used for modeling of process parameters of powder injection molding since the average value of the prediction error is below 7%, and boron carbide based products can be produced by using LPPIM method.