SU1221936A1 - Composition for calorizing metal parts - Google Patents

Description

reduces its activity during diffusion annealing.

The proposed composition of elimination raletallic parts is used in the form of a suspension: -1, which is prepared by the following preparation :.

An unsupported amount; 1 chesto zodos merge everything else: you need orthophosphoric acid and 9% of the scientific solution add individual portions of aluminum powder 3-4% off. Ace of alumina powder before termination of the reaction in c. The dissolution of the powder is carried out by heating the solution of the acid to 30–40 ° C. After cessation of the gassing in RF-KGGEOR, pour out the rest of the nopoujoK in the course of continuous liter. After careful adherence, chromic anhydride will be added. The entire suspension is mixed. The prepared suspension can be stored for a limited time in hermetic containers made of a material that is not in chemical interaction with the "ov" and no suspension of the suspension. It needs to be stirred before use.

Duration / FO; zzn e detail / yy using opmSznnogo cocvf 3a is carried out by the method oKpacKi i E following common polarity,

1. Surfaces. ; 1ta of the motor part a5eo i: wpsi 3a OT 4lp: opergated with electrocorundum,

2, Surrounding surface 4 was produced by means of an atomizer sludge; / dipping.

3, Osvostvustly suapsu of painted parts E with air at about 3 h of 1 h, and then psi temperature l 100-200 C - for 1 - ;.

4. Pro5 / -ZE will be dried antifoam annealing pr; - temperature 700 ... 1300 ° C zvzchen;; e 4. "Oh, 5 hours to open PM5MM on eosduk with votatu v: Ayi i4i: OHHoro magzva or pleir: gory / gkoy.

EXAMPLE 1: O:; y: center, pytalmntrO: s.i-ii / is aaroTO iaoic for stamping nz EP193 alloy, RosepxiiGcrb blanks of optic coping were made by blowing an electrical tool fiOiw. C) with a pulser, put one suspension of the composition containing 56 EIS.% Loro. ASD-4. phosphoric acid - 12 fnsc.%, chromic gnmdrtstsa - May 2. R. About Steel - water. From 5 to 5 zozduha prm o ras; C (3 I vary from 30.30 yrs to 0.37 Mils ,. Circuit it P; chapyglenii was 150 mi. After okr5gg (1 workpiece: (and a total of 1L1h KS to the heart 0.5 h, and sai eEw in the bushes and in the cupboard of the tempe- tfgture .., 200 ° C for 0.5 ... 1.0 h. After the drying process, we will prepare nagoev8p-l to a temperature of 1230 ° C e current of time.

provided by the technology of stamping this part, and produced their stamping. In the process of heating and aging alitizing of parts occurred.

In this case, the application of the proposed aluminizing method made it possible to coalesce the allowance for subsequent processing from 3 to 0.1 mm, and the additional labor costs consisted only in applying paint

o and its drying. Diffusion annealing was combined with heating for stamping.

Example/. Obrabzty1aali gas generator pipe with a length of 5 m of steel 20X23 H18. After degreasing; its surface is saturated with an aqueous suspension of a composition containing up to 5 May.% aluminum powder of the grade ASD-4, orthophosphoric acid - 13% by weight and chromic anhydride - 2.5%, the rest is water. Then the surface

0 Tpybbf was dried with air at room temperature for 1 h and npw at a temperature of 120 ... 200 ° C for 1 h by passing hot air through a tube. After drying, the pipe was subjected to diffusional OBV 11 /; gu at a temperature of 1080 ° C for 1 h S of the shaft-type furnaces. The thickness of the aluminized layer was 80 ... 100 µm. Heat resistance, estimated at 1 by the rotation of the mass HF; oxidation at a temperature of 300 hours, increased 12 times compared with the unprotected material of this pipe.

PRI iMer 3. The thermocamera case, which is used for experimental works in the laboratory, is 1 x in the R6 type furnaces, degreased with an aqueous solution containing 3% by weight of HPLC4 and 3% by weight of the surfactant Smntznol DS-10, - by spraying, a layer of an aqueous suspension of the composition, containing dAmdium powder of the grade ASD-4 - 45%, and orthophosphoric acid (H3DO) —12% by weight of chromic anhydride (CgO3) was applied; , 5 us.%, The rest - zod. After dyeing, they were dried and dusted with a stream of air; 5 a, the temperature was 90– 120 ° C, and the annealing was combined with the experimental work, during which the pressure chamber was heated to 300 ° C and 1200 ° C. The term opuzhby Herr Okamery

0 increased 3 times.

PR 1 me R 4. Zagotoak under stamping nz titanium alloys 81-18 were subjected to OH-working with an electrical coris. With the help of a pulsator, zodic suspension was applied

5 COCT38S, containing 52% by weight of aluminum powder grade ASD-4; 10 wt.% Ortho-: aosforky acid; 3% by weight of chromic anhydride, the rest is water. The drying of the blanks was performed in air at room temperature for 0.8 h.

and at a temperature of 150 ± 20 ° C. Diffusion annealing was combined with heating for stamping to a temperature of 920 ° C for 1 hour. Using this composition to saturate the surface of the workpiece with algo- ria allowed us to refrain from using enamel technological coatings protecting the surface of the workpieces from oxidation .

The parameters for comparing the aluminization of parts by the method of inks using the known and proposed composition are given in Table. one.

Spent alitizing blanks for stamping alloy blades of the brand EP109. The surface of the workpiece, as in Example 1, was cleaned of scale and contamination by blowing 20 with electrocorundum No. 20. An aqueous suspension of the composition containing 40% w / w of alumina powder ASD-4, orthophosphoric acid — 10% by weight, chromium anhydride — 1 , 5 wt.%, The rest is water. After drying the preform in air for 0.5 h and at a temperature of 150 ° C for 0.5 h, the condition of the slip on the surface of the preform was monitored. It is noted that with this composition of the slip its strength is lower than with compositions corresponding to the average values of the ingredients of the proposed composition (see examples 1 ... 4). There are areas with different filling thicknesses. Partial shedding of the precipitate is observed. After heating the billet at a temperature of 1230 ° C for 30 minutes in the atmosphere of air, alithiation was carried out, but the thickness of the diffusion layer over the surface ranged from 5 to 100 microns. The unevenness of the precipitate of the slurry and the aluminide layer, as well as the low strength of the precipitate of the slurry, is explained by the discrepancy between the amount of orthophosphoric acid binder and the amount of aluminum powder. Thus, the aluminization process at the lower boundary value of the ingredients proceeds, but an uneven coating of poor quality is obtained.

Spent alitizing blanks for stamping of alloy EP109. An aqueous suspension of a composition containing 56 wt.% Aluminum powder grade ASD-4, 14 wt.% Orthophosphoric acid, 4 wt.% Chromic anhydride and the rest is water was applied to the cleaned surface of the workpiece. Cutting out the viscosity of this slurry made it difficult to obtain uniform layers using a spray gun. After the precipitate, the suspension had a high strength. Diffuse; bottom annealing was carried out at a temperature of 30 minutes in the atmosphere. The thickness of the diffusion layer was from b to 40 microns. The decrease in the average thickness of the aluminum layer is due to the significant oxidation of the aluminum powder, which is high in chromic anhydride.

The use of the invention allows to obtain the following advantages in comparison with the prototype:

reduce safety requirements through the use of non-toxic and flammable substances;

handle parts of any size:

reduce the duration of the aluminization process by 7 times;

reduce the cost of the process by eliminating special equipment, shielding gases and reducing the duration of the aluminization process 8 ... 12 times.

The test results on the heat resistance of the proposed compositions for the aluminization of metal parts are given in Table. 2

The application of the proposed suspension composition allows saturation with aluminum in an atmosphere of air.

The best results of saturation of metal parts with aluminum have a composition with an average value of ingredients. After spraying, a uniform layer has high strength. After firing - a uniform diffusion layer has a high heat resistance and corrosion resistance.

Table 1

4.35 test S00 ... 1100 ° C

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Compiler j. 5u | uskhoza Editor 3. Pilmpenko Tehred U. Morgent "Corrector T,

Order 1634 Circulation: Subscription

BHi l / inn State Commission: Committee on & rfsoSpsTeHMSiii and the opening of the State Committee for Science and Technology, CCCt 113035, MOSCOW. G-35. g-; ab :, 4/5

Proizodno-mzdatelsky P ggeit, Uzhgorod, Gagarikz str. 101

Continued table. one

Composition, wt.%

Proposed

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Claims (1)

(54X57) COMPOSITION FOR ALITING METAL PARTS, containing aluminum, characterized in that, in order to reduce its toxicity and improve processability, it additionally contains phosphoric acid, chromic anhydride and water, in the following ratio, wt.%: Aluminum 40-56 Phosphoric acid 10-14 Chromic Anhydride 1.5-4.0 Water Else