RU2447968C1 - Composition for casting investment patterns - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. Composition comprises solid hydrocarbon in amount of 0.1-80 wt %, and/or wax in amount of 0.1-80 wt %, and/or polymer with fusion temperature of up to 300°C in amount of 0.05-30 wt %, and phthalic acid in amount of 0.1-99.0 wt % as filler.

EFFECT: phthalic acid increase harness, heat and crack resistance, decrease ash content and linear shrinkage of investment patterns.

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Description

The invention relates to foundry, namely to investment casting, and can be used for casting GTE blades and other parts of complex configuration. A known composition for the manufacture of investment castings (see RF patent No. 2182057, class B22C 7/02, publ. 05/10/2002), including solid hydrocarbon and / or wax in an amount of 0.1 to 80 wt.%, And / or a polymer with a melting point up to 300 ° C in an amount of 0.05-30 wt.%, as well as a thermopolymer resin in an amount of up to 80 wt.%. This composition has a sufficiently high but unstable strength (7.0 MPa) and heat resistance (40 ° C) due to the instability of the properties of the oil-polymer resin, which leads to a violation of the geometric dimensions of the molded parts and to the inability to manufacture castings of large parts.

The technical results of the claimed invention are to increase the strength, heat resistance, crack resistance of the composition, reduce ash content, as well as obtain the composition of the composition with more stable hardness (due to lower average penetration) and linear shrinkage, increase manufacturability while expanding the range of manufactured models of parts. These technical results are achieved by the fact that the composition for the manufacture of investment castings contains solid hydrocarbon from 0.1 to 80 wt.% And / or wax in an amount of from 0.1 to 80 wt.% And / or a polymer with a melting point up to 300 ° C. in an amount of from 0.05 to 30 wt.%, according to the claimed solution, the composition additionally contains phthalic acids in an amount of from 0.1 to 99.5 wt.%, used as a filler.

Introduction to the composition of phthalic acids used as an excipient is an essential feature, because terephthalic acid does not melt during manufacture as the main components, it is in suspension, which allows to increase the strength and heat resistance of the model composition and reduce linear shrinkage, which positively affects the stability of the geometric dimensions of models of any complexity.

The implementation of the possibility of achieving the claimed technical results of the implementation of the claimed invention is confirmed by testing the properties of the obtained compositions. Table 1 shows the composition of the compositions shown in wt.%. Table 2 shows the result of testing the properties of the compositions.

In the example below, terephthalic acid (benzene-1,4-dicarboxylic acid of the “pure” qualification, see TU6-09-4743-79), which is part of the group of phthalic acids that have the necessary general properties, which are manifested when used in as a filler of the claimed composition, to obtain the claimed technical results. Phthalic acids are not melted in the manufacture of the composition as the remaining components, but are in suspension. The dimension of the suspension is determined by the diameter of the sieve mesh, which is 0.5 mm, through which phthalic acids are passed before being introduced into the composition. As an example, a composition for the production of lost wax models is used, containing paraffin (see GOST 23683-89) as a solid hydrocarbon, sevylene (ethylene vinyl acetate copolymer, see TU 6-05-1636-97) as a polymer with a melting point up to 300 ° C, polyethylene wax PV3OO (see TU300041455.024-2002) as a wax, terephthalic acid (benzene-1,4-dicarboxylic acid of the “pure” qualification, see TU6-09-4743-79) as a filler.

Preparation of the model composition is as follows. The calculated amount of paraffin (see GOST 23683-89), sevilen (ethylene vinyl acetate copolymer see TU6-05-1636-97), polyethylene wax PV300 (see TU300041455.024-2002) are loaded into the mixer and heated to 110 with constant stirring up to 130 ° C. Bring to a complete melting of the components and introduce the filler. The finished mass of the composition is pressed at a temperature of 65-85 ° C, depending on the configuration and complexity of the part.

Table 1 The compositions of the wt.% No. p / p No. of composition Paraffin Wax polyethylene Savilen Terephthalic acid one 2 3 four 5 6 one 1.1 0.1 thirty 10 59.9 2 1.2 40 10 5 45 3 1.3 80 5 3 12 four 1.4 80 0.1 7.9 12 5 1.5 40 40 2 eighteen 6 1.6 10 80 5 5 7 1.7 40 9.95 0.05 fifty 8 1.8 fifty 5 fifteen thirty 9 1.9 60 one thirty 9 10 1.10 80 10 9.9 0.1 eleven 1.11 40 5 5 fifty 12 1.12 0.1 0.1 0.05 99.75 13 2.1 0.1 fifty - 49.9 fourteen 2.2 40 40 - twenty fifteen 2.3 80 10 - 10 16 2.4 fifty 0.1 - 49.9 17 2.5 40 40 - twenty eighteen 2.6 fifteen 80 - 5 19 2.7 fifty 49.9 - 0.1 twenty 2.8 45 5 - fifty 21 2.9 0.1 0.1 - 99.8 22 3.1 - 0.1 10 89.9 23 3.2 - 40 5 55 24 3.3 - 80 5 fifteen 25 3.4 - 40 0.05 59.95 26 3.5 - 40 fifteen 45 27 3.6 - 40 thirty thirty 28 3.7 - 70 29.9 0.1 29th 3.8 - 45 5 fifty thirty 3.9 - 0.1 0.05 99.85 31 4.1 0.1 - 9.9 90 32 4.2 40 - 10 fifty 33 4.3 80 - 5 fifteen 34 4.4 80 - 0.05 19.55 35 4.5 80 - fifteen 5

one 2 3 four 5 6 36 4.6 60 - thirty 10 37 4.7 80 - 19.9 0.1 38 4.8 45 - 5 fifty 39 4.9 0.1 - 0.05 99.85 40 5.1 0.1 - - 99.9 41 5.2 40 - - 60 42 5.3 80 - - twenty 43 6.1 - 0.1 - 99.9 44 6.2 - 40 - 60 45 6.3 - 80 - twenty 46 7.1 - - 0.05 99.95 47 7.2 - - twenty 80 48 7.3 - - thirty 70

table 2 Formulation Properties No. p / p Composition No. Strength in static bending, MPa Drop point, ° С Heat resistance, ° С Ash content,% Penetration at a load of 200 g (0.1 mm) Linear shrinkage,% The presence of cracks in the samples one 2 3 four 5 6 7 8 9 one 1.1 8.9 90 48 0.019 1,0 0.55 - 2 1.2 8.0 85 46 0.013 1,0 0.58 - 3 1.3 7.1 70 40.5 0.001 3.0 0.65 - four 1.4 7.2 75 42 0.011 2.5 0.61 - 5 1.5 9.2 96 46 0.013 2.0 0.60 - 6 1.6 9.6 90 44 0.017 1,0 0.63 - 7 1.7 9.7 92 49 0.016 1,0 0.55 - 8 1.8 7.9 85 42 0.01 1,0 0.59 - 9 1.9 7.1 78 41 0.01 2.0 0.65 - 10 1.10 7.2 76 41 0.01 2.0 0.65 - eleven 1.11 8.9 88 45 0.018 1,0 0.55 - 12 1.12 9.8 95 fifty 0.013 1,0 0.55 - 13 2.1 9.5 96 48 0.019 1,0 0.57 - fourteen 2.2 8 88 42 0.016 1,5 0.60 -

one 2 3 four 5 6 7 8 9 fifteen 2.3 7.9 78 41 0.01 2.0 0.65 - 16 2.4 8.0 89 46 0.01 1,0 0.60 - 17 2.5 7.9 88 44 0.016 1,0 0.64 - eighteen 2.6 7.1 80 41 0.011 2.0 0.65 - 19 2.7 7.3 90 40.5 0.01 2.0 0.65 - twenty 2.8 8.0 89 44 0.016 1,0 0.57 - 21 2.9 9.5 98 49 0.017 1,0 0.55 - 22 3.1 9.6 93 48 0.014 1,0 0.55 - 23 3.2 9.0 90 45 0.012 1,0 0.56 - 24 3.3 8.0 89 42 0.012 1,5 0.60 - 25 3.4 8.2 89 44 0.015 1,0 0.56 - 26 3.5 8.0 88 44 0.016 1,0 0.56 - 27 3.6 8.1 90 46 0.015 1,0 0.57 - 28 3.7 7.3 88 43 0.019 2.0 0.65 - 29th 3.8 8.7 93 47 0.018 1,0 0.57 - thirty 3.9 9.7 97 48 0.019 1,0 0.55 - 31 4.1 9.9 99 fifty 0.019 1,0 0.55 - 32 4.2 9.1 93 46 0.017 1,0 0.55 - 33 4.3 7.3 80 41 0.01 1,5 0.65 - 34 4.4 7.6 81 42 0.01 1,2 0.62 - 35 4.5 7.01 77 40.5 0.01 2.0 0.65 - 36 4.6 7.2 85 42 0.01 1,6 0.64 - 37 4.7 7.1 77 40.5 0.01 2.0 0.65 - 38 4.8 8.0 86 46 0.014 1,0 0.57 - 39 4.9 9.8 96 49 0.018 1,0 0.55 - 40 5.1 9.5 98 48 0.019 1,0 0.55 - 41 5.2 8.6 91 46 0.015 1,0 0.57 - 42 5.3 7.1 80 41 0.01 2.0 0.65 - 43 6.1 9.5 98 49 0.019 1,0 0.55 - 44 6.2 9.0 93 47 0.017 1,0 0.55 - 45 6.3 8.6 88 45 0.015 1.15 0.63 - 46 7.1 9.6 97 47 0.019 1,0 0.55 - 47 7.2 9.5 97 48 0.019 1,0 0.55 - 48 7.3 9.0 96 47 0.018 1,0 0.56 -

Claims (1)

Composition for the manufacture of investment castings containing solid hydrocarbon from 0.1 to 80 wt.%, And / or wax in an amount of from 0.1 to 80 wt.%, And / or a polymer with a melting point up to 300 ° C in an amount from 0 , 05 to 30 wt.%, Characterized in that it additionally contains phthalic acids in an amount of from 0.1 to 99.95 wt.%, Used as a filler.