Suspension for preparing currant-conducting coat

FIELD: electric engineering industry.

SUBSTANCE: invention proposes a suspension for preparing current-conducting coat that comprises sodium meta-silicate, graphite, aluminum oxide, ferric (III) oxide, strontium carbonate, potassium titanate, barium oxide and hydrochloric acid taken in the following ratio of components, wt.-%: sodium meta-silicate, 28-30; graphite, 11-15.5; aluminum oxide, 3.5-3.7; ferric (III) oxide, 3.5-3.7; strontium carbonate, 3.5-3.7; potassium titanate, 4.2-4.5; barium oxide, 1.2-1.5; hydrochloric acid, 4.9-5.1, and water, the balance. Invention provides the creature of current-conducting coat with positive temperature resistance coefficient for conferring high resistance to heat loadings to it. Invention can be used in producing film heating surfaces and electric heaters.

EFFECT: valuable properties of suspension.

1 tbl

 

The invention relates to the electrical industry and can be used in the production of the film heating coatings and electric heaters.

Known electrically conductive composition based polyacetale resin containing oxymethylene polymer, conductive carbon black and thermoplastic polyurethane [RF Patent №2179762, "Semiconducting polyacetylene composition", IPC7N 01 In 1/24, 08 K 3/04, publ. 20.02.02, bull. No. 5].

Known conductive material obtained by the polymerization of propylene on the surface of particles of the carbon material, pretreated alyuminiiorganicheskikh compound, in the presence of ORGANOMETALLIC catalytic systems [RF Patent №2200170, "a Method of obtaining heat and electrically conductive material and the material obtained in this way", IPC7C 08 F 292/00, 08 L 23/12, 08 K 3/04 // N 01 In 1/24, publ. 10.03.2003, bull. No. 7].

These compounds cannot be used for the deposition of conductive films on a material with a softening temperature below 2200°With, for example glass.

Closest to the technical nature of the claimed invention is the suspension to obtain a conductive coating containing metasilicate sodium, graphite, water, aluminum oxide and iron oxide (III) with the following content, wt.%:

Metasilicate sodium18-26
Graphite10-20
Aluminium oxide4-12
Iron oxide (III)4-12
WaterRest

[A.S. USSR №1791852, "Suspension to obtain a conductive coating", IPC5N 01 1/00, publ. 30.01.93, bull. No. 4].

A disadvantage of the known film is a negative temperature coefficient of resistance, which gives the film coating low resistance to thermal stress.

The invention is aimed at creating a conductive coating with a positive temperature coefficient of resistance to give it high resistance to thermal stress.

This is achieved by the fact that the suspension, including metasilicate sodium, graphite, aluminum oxide and iron oxide (III), further comprises strontium carbonate, potassium titanate, barium oxide and hydrochloric acid in the following ratio, wt. %:

4,2-4,5
Metasilicate sodium28-30
Graphite11-15,5
Aluminium oxideof 3.5-3.7
Iron oxide (III)of 3.5-3.7
Strontium carbonateof 3.5-3.7
The potassium titanate
The barium oxide1,2-1,5
Hydrochloric acid4,9-5,1
WaterRest

Comparative analysis of the prototype allows us to conclude that the claimed composition suspension differs from the known to the introduction of new components, namely strontium carbonate, potassium titanate, barium oxide and hydrochloric acid. Thus, the proposed solution meets the criterion of "novelty". Analysis of the known conductive compositions showed that to obtain the properties of the films, what they show in the inventive solution, namely the presence of a positive temperature coefficient in graphite system, leading to high resistance to thermal stress; the proposed composition of the ingredients used for the first time and the result is not due to the known properties of new components. Thus, this composition gives the film the new properties, which allows to make a conclusion on the conformity of the proposed solutions to the criterion of "inventive step".

For experimental verification of the claimed composition was made a few mixes ingredients, five of which are presented in the table. A mixture was obtained by simple mixing of the components. Suspension brush was applied to the surface of ludanyi plates. The film thickness is 0.2 to 0.4 mm

Samples of mica plates coated film was progulivali at a temperature of 300°C for 5-7 hours. The table presents the properties of the samples subjected to heat treatment with different ratio of ingredients.

no PPThe ratio of components, wt. %.Temperature coefficient of resistance, αR, Om/°Note
1Metasilicate sodium - 28,5; graphite - 14; aluminium oxide - 3,6; iron oxide (III) - 3,6; strontium carbonate - 3,6; the potassium titanate of 4.3; the barium oxide - 1,4; hydrochloric acid - 5; water - 36.20
2Metasilicate sodium - 30; graphite - 11; aluminium oxide - 3,7; iron oxide (III) - 3,7; strontium carbonate and 3.7; the potassium titanate is 4.5; the barium oxide - 1,2; hydrochloric acid - 5,1; water - 37,1.15
3Metasilicate sodium - 28; graphite - 15,5; aluminium oxide - 3,5; iron oxide (III) and 3.5; strontium carbonate - 3,5; potassium titanate - 4,2; barium oxide - 1,5; hydrochloric acid - 4,9; water - 35,4.15
4Metasilicate sodium - 35; graphite - 14; aluminium oxide - 3,5; iron oxide (III) and 3.5; strontium carbonate - 2,8; potassium titanate - 5,7; barium oxide a-0.7; hydrochloric acid - 5; water - 29,8.-0,5A negative temperature coefficient of resistance, swelling during drying
5Metasilicate sodium - 18; graphite - 14; aluminium oxide - 3,6; iron oxide (III) and 3.5; strontium carbonate - 3,5; potassium titanate - 4,2; barium oxide - 2,8; hydrochloric acid - 5; water - 45,4.-10The low strength of the film coating, the negative temperature coefficient of resistance

The suspension of the proposed composition (claims 1 to 3) has a positive temperature coefficient, which gives the film coating for high resistance to thermal stress and, consequently, allows to increase service life of products.

The table shows that reducing the content of sodium silicate below 28% not feasible due to the reduced strength of the film and reduce the heat load. The increase in the content of sodium metasilicate more than 30% leads to swelling of the coating during the heat treatment and the disappearance of the positive temperature coefficient of resistance.

When exiting the optimal limits of concentrations of aluminum oxide and iron oxide, the decrease of the mechanical strength and heat load film coating.

Excess graphite content is undesirable because of the small ohmic resistance and ischeznut is I positive temperature coefficient of resistance. The graphite content of less than 11% leads to a sharp increase in resistance, which has a negative effect on the technological characteristics of the film coating (lowering the temperature of a heating surface).

The output of the optimal limits of concentrations of strontium carbonate, barium oxide and potassium titanate leads to a decrease of the temperature coefficient of resistance. The optimal concentration of hydrochloric acid adjusts the pH of the suspension.

The suspension is stable at optimal concentrations for three months, during this time it can be stored in airtight containers at room temperature without increasing the viscosity and loss of functional properties.

Suspension to obtain a conductive coating including metasilicate sodium, graphite, aluminum oxide and iron oxide (III), characterized in that it further comprises strontium carbonate, potassium titanate, barium oxide and hydrochloric acid in the following ratio, wt.%:

Metasilicate sodium28-30
Graphite11-15,5
Aluminium oxideof 3.5-3.7
Iron oxide (III)of 3.5-3.7
Strontium carbonateof 3.5-3.7
The potassium titanate4,2-4,5/td>
The barium oxide1,2-1,5
Hydrochloric acid4,9-5,1
WaterRest



 

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