SU887536A1 - Charge for making container for high-pressure device - Google Patents

Description

cop from the group B4C, A1N, FcaOg, ZrOj, NU :, SiO2, CrO2 and / or the reinforcing component from the group: fiberglass, aebeste, vermiculite fibers at the following ratio of the components, weight. %:

Filling50-90

20-45% solution of the compound from the group MgCl2-6H20, CaCl ... .bNaO.

MgCNOa). bNaO, Ca (MOZ) 2 .4H2O9-45

Component from B4C, AIN, RegOz, Zr02, Hf02, SiO, АЬОз, С СООз and / or fiberglass, asbestos, vermiculite fibers 0,5-40

As a result of the chemical interaction of the dielectric material consisting of oxides of magnesium, calcium, zinc, calcium carbonate, as well as substances (lithographic stone, pyrophyllite, talc) containing oxides in their composition, with 20-45% aqueous solution of chlorides or nitrates bivalent metals (, CaCl3) bbc, Mg (NO3) 2 bNoO, Ca (NO3) 2 iHaO) polymerization occurs and the formation of an enlarged polymer molecule from many identical molecules, which leads to the formation of the prostrate-mesh structure of the cured composition. This produces a heat resistant material that deforms well and conveys pressure. When the content in the mixture of chlorides or citrates is less than 9 wt. % polymerization is not intensive enough, and with their content of more than 45 weight. The temperature of the containers deteriorates.

Introduction to the mixture of heat-resistant oxides, including oxides of transition metals, such as AbOz, Fe2Oz, ZrOz, HfO2, Cr2Oz and SiOa, as well as fibrous fillers: asbestos, glass, vermiculite fibers in the amount of 0.5-40 wt. % relative to the dielectric material and chlorides or nitrates leads to the formation of reinforced polymer material. Mechanical strength is enhanced by reinforcement. containers, their creep decreases, which increases the pressure range developed in the containers. The content of the fillers outside the specified limit reduces either the pressure or the heat resistance of the containers.

Containers of the proposed mixture are made in a predetermined form, both directly as a result of polymerization and as a result of pressing of polymer powders. In the latter case, polyvinyl alcohol or bakelite lacquer or other binders are added to it in order to compressibility of the binder into an amount of 0.2-10 weight. % When Ialicia

in the binder container above 10 wt. The pressure decreases, and when its content decreases by more than 0.2%, it deteriorates compressibility.

The technology of preparation of the charge for the manufacture of containers is as follows.

Take fine-grained powders of a dielectric material - MgO, CaO, CaCOz. ZnO, lithographic stone, pyrophyllite,

talcum powder, as well as powders of the indicated heat-resistant oxides, and / or asbestos, glass, vermiculite fibers 0.5-0.7 mm in size. A 20-45% aqueous solution of chlorides or nitrates is compounded, to which the listed components are added. After careful mixing of the mixture, containers of a given shape are molded or pressed from it. The polymerization of containers occurs at room temperature or at temperatures in the range of 60-180 ° C.

In addition, containers can be made by crushing a polymerization material and mixing it with a polyvinyl alcohol or a bakelite varnish with acetone. In this case, the mixture is dried at 30-40 ° C to a slightly damp state, and then rubbed through a sieve. After the subsequent skimming with periodic mixing at 40 ° С, the charge should have a rather good flowability, not clumping and not smell. From the mixture obtained by the above method, containers of the required (| forage and sizes, which, after being kept in air at room temperature for 24 hours), are pressed; at at 60– 180 ° C for 120 min.

45, -,

The resulting coitheaters are filled with a reaction mixture to obtain superhard material. The stress is carried out in any known high pressure device.

t-Q creates a pressure of 50-100 kbar and a temperature of 1200-2800 ° C.

The table shows the results of the testing of the container obtained from the proposed and lime charges — its heat resistance and pressure value developed in it with a press force of 350 tons.

The heat resistance of the containers is determined as 0 at the beginning of their burnout in the central part at a pressure of 50 kbar and a dwell time of 2 minutes. Hexagonal boron nitride with magnesium diboride (10-15 wt.%) And boron nitride are used as the reaction mixture.

As can be seen from the table, the additional introduction of heat-resistant oxides and fibrous filler into the dielectric material of solutions of chlorides or nitrates of divalent metals increases the heat resistance of containers from an average of 1,540 to 2,170 ° C and a pressure of 44 to 55 kbar.

The use of the proposed container for containers increases the yield and quality of powders, mono- and polycrystals of cubic boron nitride, since in the process of the synthesis, there is no pressure change due to the burnout of the container.

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Claims (1)

Invention Formula The mixture for the manufacture of a container of a high pressure device containing a filler from the group of: lithographic stone, calcite, pyrophyllite, talc, MgO, CaO, CaCO3, ZnO, and bonding it, characterized in that, in order to increase the range of developed pressures and increase service temperature, it contains as a binder a 20-45% solution of a compound from the group: NgCb-6 120, CACL-bHgO, Mg (NO3b 6H, O, Ca (UOz). 4H2O, and additionally contains a component from the group: B4C, A1N, RegOz, ZrOo. Hf02, SiOs, AOOz, CrGO3 and / or reinforcing component from the group: glass fiber, asbestos Vermiculite fibers in the following ratio of components, wt.%: Filling50-90 20-45% solution of the compound from the group MgCb 6Н20, bNoO, Mg (NO3) o. BNGO, SA (CUS) 2. 4H2O9-45 Component from group B4C, A1N, ReZOZ, ZrO2, HfO ,, SiO, 7 AO3, Cr2O3 and / or fiberglass, asbestos, vermiculite fibers 0.5–40 887536 8 Information sources taken into account during the examination 1. USSR Author's Certificate No. 642271, cl. From 04 to 35/00, 1976.