SU511135A1 - Dusting material - Google Patents

Description

one

The invention will be cast to melt models and can be effective |

all use in the manufacture of shell

forms.

Exterior coatings are known for southeating; OUTPUTS using aluminothermic exothermic additives.

soil material for these coatings is applied. put quartz sand that does not exclude

possibility of cracking, softening

and destruction of shell forms and decrease in labor productivity.

The formation of cracks is due to the fact that, due to the low thermal conductivity of the bulk quartz sand, the exothermic reaction proceeds and ends w simultaneously on the entire outer surface of the shell, and is alternately localized in different parts of the form: first, | jg speakers, and then on all the rest11. The time difference after the end of the exotherm | This reaction causes irregularity of the heat-strain strain on the surface of the |

pads, which leads to the formation of eg jj

-. it

cracking and breaking of the shell.

The proposed material increases the thrust resistance and durability of the shell. To do this, it additionally contains the same curry powder of the following ratio:% Ingredient, wt.%:

Iron1oroshok4O, 0-60, O

i Quartz sandEverything.

bJto provides an increase in crack resistance and reduces the defect destruction of the shell by reducing by 2 "times the exposure time of the shell j under the influence of thermal stresses and also increases labor productivity by increasing the height of the shell shape from 32О-45Оо up to 500 mm, due to the increase in gfachoti shell.

The material is used in shell molds made multi-layered in the usual way; taken in casting on the melted models of the technology of the wood of each layer: dipping the model block into the suspension. and powdered dusting materials; . In this case, exothermic additives (powders of aluminum and ikalina) are added to the suspension for one to two outer coatings, and iron powder is added to the composition of the dusting material. After melting and loading of the shell into the kiln at 90O-1000 C, an exothermic reaction begins on its outer dimension due to the presence of exothermic additives introduced in advance in the suspension for the first two layers. The introduction of metallic thermally conductive material into the reference material leads to a pattern that the exothermic reaction proceeds much more intensively and ends under conditions close to simultaneous across the entire outer surface of the shell. This is an I; T drive for a more uniform distribution of deformations around the shell, which drastically reduces the likelihood of cracking. Due to this, the waste is reduced by 2-3% due to the destruction of the shell from the number of manufactured shells. Moreover, during the exothermal reaction, the iron powder melts and mixes with the molten materials of the outer layers of the shell. After the end of the reaction, its products harden, forming a porous and sintered metal-ceramic conglomerate, due to the fact that the durability of the shell increases, as shown by measurements, to 128.6 kg / cm. The lower limit of the content of iron powder is 40% in the dusting material due to the exothermic reaction . Tests have shown that with the introduction of iron powder in amounts less than 4% by weight of the sparing material, the exothermic reaction time is not significant. For example, on laboratory samples made with GF named: d ethyl silicate exothermic pokr, gg11y and sprinkled with a mixture of 60% silica sand and 40% iron powder, an exothermic reaction takes 1.6-2.0 seconds, and on the same samples,) filled with quartz sand, the exothermic reaction time is 2-2.2 seconds. The upper limit of the content of the iron powder is 60% due to the technological possibilities of making shell forms. Tests have shown that the formation of more than 60% of iron powder in the composition of the dusting material leads to deformation - slipping to hide from the shell during the drying and hardening of the form, which is caused by a higher specific gravity of the powder compared to quartz sand. Examples of cociaBOB exothermic coatings are iUH with a preparative dusting mat; Example 8: 1. Suspension on bonded- .iiieiH liquid glass,%: Liquid glass (1.2 kg / l) 44.4 (1 kg) And luminium 1D 11D {O, 3 kg) Powder, dummies 33.4 (0.9 kg) Dusty Quarter 11D (0.3 kg) Samples and forms, and avant-garments, with the use of the equipment, for example, i); o6s: 1Ii) 1x quartz.vym sand with a forehead.1: .koy /;-l;.ззгг--г. binge in quantities of 4O, 5Oy 6O% O Evsu skimming, as well as for comparison - without a fine powder. In laboratory tests, it was found that, in a walkable state, the strength of specimens (made:; -; in the form of 65x2x2x4 mm plates;) is 10О, 1; YuO.O; 98.7 and 1OO, О | чгс. / См respectively 6ONNO above - Taazanym: "The hospitals were introduced; j iron. l practically remained (fuels and lubricants without short circuit;.; eeneak o After calcining g.ri 9OO C; n those for 0.5 hour, the samples had strength of 96.6; 111.1; 115.8; 9О, О kgf / cm It can be seen that the strength of the samples with the obscene iron powder (96.6-115.8 kgf / cm) is higher than the strength of the samples, C silica sand (9O kg.: -, H,,);.; B, it grows as the amount of.-leptic powder in the “Fissure.Oyscale” coating was conventionally estimated by the “ohnemeg.” The duration of the envelope under the influence of ..1MM.Extreme CIJ.iaub GaeJx; H according to the heating time of the form ( ) before eq othermal reaction (cht-o characterizes durability of lAHclc against thermal deformation, uneven: - distributed over the cross section of the wall ni.ji gki) and the duration of the pre-e-hecal e; th. ::: -Gp; GClc reaction (which characterizes the stability shells against heat. Deforms unevenly distributed over the surface of the shells). in about; the raw material of iron powder, pol. gel gelgogo affects the reduction of both terms of time (with a heat effect: 1 deformations and results to the enhancement of tresnoutios. shell, the exothermic reaction on the surface of the mold, sprinkled with iron powder, the content of the latter, 4O%, begins 167 seconds after the start of calcination and proceeds 2 seconds, and when it is 5O, or

bulk material at the same time is respectively 128 and 2 seconds or 113 and 1 second. In the forms sprinkled with one quartz sand, the same figures are 2O5 and 4 sec.

When casting, it was found that, despite the increased height of the shell molds (50 O mm), sprinkled with a mixture of silica sand and iron powder, against molds with a height of 32 O mm, sprinkled with quartz sand, from the total number of molds, filled with no supporting filler, Forkta, manufactured without the use of iron powder in the composition of the striated material, were destroyed.

(two out of eight filled forms were destroyed)

With the introduction of iron powder from the 15 cast forms into the dressing, not one was destroyed.

Increasing the height of the shell mold (block of models) leads to the possibility of placing on it more models of castings and, as a result, to an increase in labor productivity.

Example 2. Suspension on a binding ethyl silicate,%:

Hydrolyzed ethyl silicate 32-48 (1 kg

Aluminum powder 8 (0.16 kg)

Scale powder 2O (O, 417 kg)

Dusty quartz 24 (0,5OO kg).

Indicators

The content of quartz sand in obsshochkoy material wt.%

The content of metal .. metallic noro.a in obschechnom material, weight,%

Shell strength, kgf / cm

The duration of the exothermic reaction, s

Block height, mm

Marriage on the destruction of the shell,%

Labor productivity on mold manufacturing operations 5%

For example, 1 in obsp1Ochts51; to a i; ii: i- i::

the sand was injected 4О, 5О and х; eg: e .-; t-) g :) a - ;, Rosha and for sravieki: “; OBS ./-, and. e-sevsem.

It was ycTai U3 "i.e.: r :, that li, -r:; -; V.:: Standing in terms of: 5c1-. e. powder practically ko on;; - ;;; hg; F. Samples. After procals; 1 ;;; -; nijOMiocih samples significantly increased by v:; ..- .. the number of input horopa tch is much higher than the strength of the obsazgok-:; sprinkled with quartz sand (cooTiiOTC / n e; : ь} ;: nyut 1OO, 122.4; 128.6 versus 95.4 kgf / gm).

Extension; ; body code: ij. :; b1ls: g:; l onj ..-: under the influence of ter-shnichnyh ;; L ;, and

(thermal deformations) tacl; e rsszgl-ul; h ::; is compiled and the corresponding exponents of p / io-meni start to duration; no exothermic rzzhyik cons.

75 and 2; 44 to 1: 31 O (with Ton; r cv-.K; / O 0.5 ceic) prot; -. A 9E li I sec,

When backing thirteen forms with high-gsm; the stand of 42O mm, the exiled kvappevy -.- t sand, two collapsed, and 23 pho; -:: t; with a height of 100 to 500 VSM, 1: s: go; With the introduction of dusting 40-60-%: powder, not razashipish1 With;,.

In the given 1; eye: h; 1to. Prejudice to both of them.

Dusting material known for sale

60-40

100

Loroi iron 40-60

up to 10О

1-2

2-4 to 500

320-40О

15.0

130.-140

100

Vavden of yellow powder will reduce the strength and strength of fiptv-heck and in-house moisture reactions in faiths. square when iroka ivaniv last.

Claims (1)

Formula of inventions  Common material for ceramically-made shell forms, exposed to exothermic preamming and manufactured according to the design of e., Models based on quartz nedKav, characterized by the fact that, for the purpose of No. 1 of cracking resistance and durability of the shell, it additionally contains an iron with follower; the ratio of ingredients, wt.% iron Powder 4O-60, quartz sand - residual.