The influence of the presence of water-soluble low molecular weight oligomers in a paint composition on the possibility of a single high-temperature firing and decorative properties of coatings, taking into account the type of ceramic surface (porcelain or faience), the composition of pigments and the corresponding mineral fillers, has been studied. A difference was found in the color and tone of coatings, the gloss of the glaze for surfaces of various aluminosilicate modules and temperature regimes.
The results of successful application of the method of laser drilling of micro-holes with a diameter of 30 - 200 µm in glasses with a thickness of 0.1 to 0.8 mm are presented. Achievement of high quality of holes with high productivity of the process is ensured by the use of immersion coolant in the process of piercing holes, which is in contact with the lower surface of the glass.
In the Li 2 O-ZnO-TiO 2 system, a material has been developed for the technology of low-temperature co-firing of ceramics with a view to its use in the production of electronic components. The sintering temperature of the material was reduced from 1075 to 950 & # 176; C due to the introduction of 3.0 & # 37; sintering additive of eutectic composition in the system Li 2 OB 2 O 3 -SiO 2 . The developed ceramics, obtained at 950 & # 176; C, is characterized by a density of 4.14 g / cm 3 , as well as the following dielectric properties: dielectric constant & # 949; = 23.1 and the dielectric figure of merit Q * f = 832 MHz
The issue of the prospects of using ceramic composite materials in heat-loaded units of advanced aviation technology instead of metallic materials is considered. Research has been carried out on the manufacture of ceramic composite materials based on silicon carbide, reinforced with whiskers (whiskers), by hot pressing and spark plasma sintering with the use of oxide and nitride sintering additives. A complex of physical, mechanical and thermal properties of composites was investigated.
The effect of molarity (from 3.64 to 1.74 M) of a solution of an alkaline activator (ALA) and temperature (from 10 to 20 ° C) of a mixture of alkali-activated materials (ALA) based on chamotte and metakaolin on the rheological properties was investigated. the development of the structure during curing and the strength of the samples after firing at temperatures of 800 and 1000 ° C. It has been established that a decrease in the molarity of the ALCA and an increase in temperature reduce the viscosity of the AHAM mixture. An increase in the molarity of the PCA and the temperature of the mixture accelerates the process of structure formation and leads to an increase in the strength of the samples during curing from 8.8 to 22 MPa and from 6.8 to 20 MPa after firing at a temperature of 1000 ° C. Also, the density of samples after firing increases from 1270 to 1510 kg / m 3 , and water absorption decreases from 15.4 to 13.4 & # 37;
The development of effective ceramic lining materials is an important industry challenge. Alumophosphate binder materials may be considered new for hydrocyclone applications. This work is devoted to the study of the content of the binder, its modification and calcination temperature on the properties of the final products. Particular attention is paid to the study of the main properties for the use of ceramic materials as lining: porosity, water adsorption, density. Several composite materials were obtained with improved properties due to reinforcement with coarse-grained silicon carbide
An algorithm for calculating the parameters of the structure of silicon carbide ceramic compositions of the system abrasive grain - bond - pores is described. The mathematical formulas required to use the algorithm are given. An example of the implementation of the algorithm in a production environment is given.
It is noted that when implementing the processes of magnetophoresis (one of the types of which is magnetic separation, used in various industries, including glass and ceramic), along with information about the fractional fraction of magnetoactive particles, information about their magnetic susceptibility is also fundamental. , depending on the strength of the applied field H. The data are given & # 967; for iron-containing particles-impurities of quartz sand, obtained from the results of measurements of the magnetic susceptibility of their powder samples. It is shown that the parameter & # 967;, being inversely dependent on H (with an exponent close to 0.75), significantly & # 171; suppresses & # 187; the role of the parameter H appearing in the basic expression for the magnetic force of particle capture. When creating magnetophoresis (separation) devices, it is recommended to pay increased attention not so much to the parameter H, as to the parameter characterizing the field inhomogeneity,? gradH, more responsible for the capture of particles
Clinker materials were obtained from non-ferrous metal waste, where the clay part of the tailings was used as the clay material. gravity of zircon-ilmenite ores (GZI), and feldspar concentrate (PShK) - a by-product of rare-earth metals without the use of natural traditional materials - as a flux. Studies have shown that the content is & # 171; dangerous & # 187; pore sizes 10-5 - 10-7 m in samples from HZI is 74 & # 37 ;. The introduction of PShK (feldspar concentrate) into the composition of ceramic masses reduces the content of & # 171; hazardous & # 187; pores with sizes 10-5 - 10-7 m up to 51 & # 37 ;. In addition, the introduction of PShK into the compositions of ceramic masses significantly changes the distribution of micropores, while the samples with feldspar concentrate are characterized by the appearance of a maximum of 32 & # 37; in the area of ??pores with sizes 10-6 - 10-7 m, which indicates a more uniform distribution of pores
The results of a study of the processes underlying the formation of hollow alumina-magnesia microspheres during chemical dispersion of aluminum-magnesium alloys with an increased magnesium content are presented. The mechanism of formation of microspheres and the factors that determine their structural features and sizes have been clarified. The effect of magnesium additions on the processes of formation of the structure of hollow microspheres and their amount is shown. Studied the fine structure of powders before and after heat treatment
