GOST 26469-85

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  ГОСТ 26469-85

GOST 26469−85 Wire of palladium-tungsten alloy. Specifications (with Change No. 1)

GOST 26469−85

Group В74

INTERSTATE STANDARD

WIRE OF PALLADIUM-TUNGSTEN ALLOY

Specifications

Palladium and tungsten alloy wire. Specifications

ISS 77.150.99
GST 18 6190

Date of introduction 1986−01−01.

Resolution of the USSR State Committee for standards from 22 March 1985 N 701 date of entry installed 01.01.86

Limitation of actions taken by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (ICS 11−12−94)

Edition (July 2004) with amendment No. 1, approved in may 1990 (IUS 8−90).

This standard applies to the wire of palladium-tungsten alloy that is used as the resistive material in the electric and electronic industries.

1. ASSORTMENT

1.1. The diameter of the wire and limit deviation shall be as specified in table.1.

Table 1

Wire diameter, mm	Limit deviation, mm	OKP code
0,020	+0,002 -0,001	18 6194 9281
0,025	±0,002
0,030	+0,003 -0,002	18 6194 9381
0,035
0,040
0,045
0,050
0,055
0,060
0,065
0,070
0,075
0,080
Of 0.085
0,090
0,095
0,100
0,110
0,120	-0,01	18 6194 9661
0,130	±0,009	18 6194 9661
0,140
0,150
0,160
0,170
0,180
0,190
0,200
0,210
0,220
0,250
0,300
0,400	-0,025	18 6194 9851
0,500
0,700	-0,030
0,800
1,200	-0,035	18 6194 9861

(Changed edition, Rev. N 1).

1.2. The roundness of the wire must not exceed:

0,003 mm	for	diameters	wire	0,020−0,050 mm;
0.004 mm	"	"	"	0,055−0,110 mm;
0,006 mm	"	"	"	0,120 mm.

If wire diameter more than 0,120 mm, the roundness of the wire must not exceed half the tolerance on the diameter.

The legend is shown under the following abbreviations:

solid state — T;

soft as — M;

with the determination of the electric resistance of 1 m wire — S;

determining the relative elongation — U.

Examples of symbols:

Wire of alloy grade PDV-20, solid, with a diameter of 0.200 mm:

Wire PDV-20 T 0.2 GOST 26469−85

The same, soft, with the determination of the electric resistance of 1 m and elongation, diameter 0,045 mm:

Wire PDV-20 IAS 0,045 GOST 26469−85

(Changed edition, Rev. N 1).

2. TECHNICAL REQUIREMENTS

2.1. Wire shall be manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

2.2. The wire must be manufactured from palladium and tungsten alloy grade PDV-20 with the chemical composition given in table.2.

Table 2

Grade	Chemical composition, %
Palladium	Tungsten	Impurity, not more than
Platinum, rhodium, iridium, gold (amount)	Iron
PDV-20	80,0−82,0	18,0−20,0	0,2	0,1

2.3. Wire produced in solid (cold-worked) or soft (annealed) state.

Wire diameter 0,020−0,030 mm are made only in the solid state.

(Changed edition, Rev. N 1).

2.4. Rupture strength in tension shall be:

for solid wire diameters of not less than 1079 MPa (110 kgf/mm);

for soft wire with a diameter of 0.1 mm or less — 765−1030 MPa (78−105 kgf/cm); diameter more than 0.1 mm 765−981 MPa (78−100 kgf/mm).

Physico-mechanical properties of the wire are given in Appendix 3.

2.5. The resistivity of wires shall be those specified in table.3.

Table 3

The condition of the material	Specific electric resistance of wire, Ω·mm/m at 20°C
Solid	0,85−0,99
Soft	0,95−1,10

2.6. Temperature coefficient of electrical resistance of the soft wire in the temperature range 0°C-100°C shall be not more than 7.5·10grad, solid wire — no more than 15·10deg.

(Changed edition, Rev. N 1).

2.7. The surface of the wire must be clean, smooth, without cracks, shells, shells, delamination, scratches, scratches and foreign debris. On the surface of the wire allowed a separate surface damage if they are not output when the control wire Stripping for limit deviation for diameter. On the surface of the wire allowed the local darkening and dullness.

2.8. Wire diameter of 0.4 mm or less manufactured is wound on a tared metal or plastic coil, wire with a diameter of more than 0.4 mm are made in rolls.

2.9. The wire should be wound on a reel or folded into a wire without sharp bends in the right separatornyi rows. The winding should ensure free unwinding of the wire.

Each coil or each coil should consist of a piece of wire without splices and knots. The ends of the wire on the coil should be firmly fixed.

Allowed to bind the coils of wire in the Bay.

2.10. Weight of wire on a reel or coil shall be as defined in table.4.

Table 4

Wire diameter, mm					Weight of wire on a reel or on a spool, g, not less
0,020					0,3
0,025					0,5
0,030					4,0
SV.	0,030	to	0,040	incl.	5,0
"	0,040	"	0,050	"	10,0
"	0,050	"	0,090	"	15,0
"	0,090	"	0,140	"	30,0
"	0,140	"	0,250	"	50,0
"	0,250	"	0,400	"	100,0
"	0,400	"	1,200	"	200,0

(Changed edition, Rev. N 1).

2.11. The operating conditions of the wire is given in Annex 4.

2.12. Electrical resistance of 1 m wire in soft (annealed) state under normal climatic conditions should be as given in table.5, with maximum deviations in diameter may differ from those shown in table.1.

Table 5

Nominal diameter of wire, mm	Electrical resistance of 1 m of wire, Ohm
The upper limit	The lower limit
0,035	1180	890
0,040	863	715
0,045	709	581
0,050	571	467
0,055	473	387
0,060	386	316
0,065	334	274
0,070	284	237
0,075	260	214
0,080	224	184
Of 0.085	197	161
0,090	176	144
0,095	159	131
0,100	149	123
0,110	116	92
0,120	112	88
0,130	86	64
0,140	80	60
0,150	69	51
0,160	58	48

2.13. Elongation of wire in soft (annealed) condition should be as given in table.6.

Table 6

Nominal diameter of wire, mm					Elongation, %, not less
From	0,035	to	0,045	incl.	7
SV.	0,045	"	0,070	"	9
"	0,070	12

The elongation of the wire prior to 01.01.93 rejection is not a sign and is defined for statistical purposes.

2.12, 2.13. (Added, Rev. N 1).

3. ACCEPTANCE RULES

3.1. Wire take parties. The party should consist of wire of the same diameter, one state of material to be furnished by a single document about quality that contains:

trademark or the name and trademark of manufacturer;

symbol wire;

batch number;

the chemical composition of the alloy;

the mass of the wire in the party;

the room and the number of coils or skeins;

electrical resistivity or electrical resistance of 1 m wire;

rupture strength;

elongation;

the date of manufacture;

stamp of technical control.

3.2. To check the appearance, diameter, electrical resistivity or electrical resistance of 1 m wire weight of wire carried on each reel or coil of wire.

Determination of electrical resistance of 1 m wire is carried out at the request of the consumer.

3.3. To determine the temporary tear resistance tensile and elongation take 10% of the coils or coils from the party, but not less than three.

The definition of elongation is carried out at the request of the consumer.

3.1−3.3. (Changed edition, Rev. N 1).

3.4. To determine the chemical composition selected, one skein or coil of the party.

Allowed the manufacturer to determine the chemical composition of the sample taken from the molten metal or the ingot.

Determination of impurities is carried out periodically once in a quarter.

3.5. The test temperature coefficient of electrical resistance is carried out periodically, once a quarter on a single reel or coil of the party.

3.6. If unsatisfactory results at least in one of the figures on it, repeat tests are carried out at twice the sample.

The results of repeated tests apply to the entire party.

4. TEST METHODS

4.1. The wire diameter and ovality measured in two locations at a minimum distance of 100 mm from each other in two mutually perpendicular directions in each measured cross-section optistore according to GOST 28798−90 and micrometers type МК25−1 according to GOST 6507−90 or other instruments providing the required accuracy.

If there is disagreement in the evaluation of the measurements carried out by optistore churchyard 28798−90 and micrometers type МК25−1 according to GOST 6507−90.

Ground wire check on laboratory scales General purpose of the 3rd accuracy class according to GOST 24104−88*.
________________
* From 1 July 2002 was put into effect GOST 24104−2001 (here and below).


(Changed edition, Rev. N 1).

4.2. Check the surface of the wire diameter of 0.15 mm and less is performed at 16to increase the diameter greater than 0,15 mm — without the use of magnifying devices.

4.3. Chemical composition of wire of palladium-tungsten alloy should be controlled by the method set out in Annex 1.

4.4. To check the electrical resistance and temporary rupture strength and relative elongation on each selected coil (coils) take one sample at a distance of not less than 1 m from the free end of the coil (coils).

4.5. Rupture strength tensile and elongation are measured according to GOST 10446−80 on samples with an estimated length of 100 mm.

4.6. Electrical resistivity or electrical resistance of 1 m wire is determined according to GOST 7229−76.

4.4−4.6. (Changed edition, Rev. N 1).

4.7. Temperature coefficient of electrical resistance is controlled by the method set out in Annex 2.

5. PACKING, MARKING, TRANSPORTATION AND STORAGE

5.1. Coils wrapped in tissue paper according to GOST 3479−85 Packed in plastic or cardboard boxes, and rolls of barbed wire, wrapped in paper according to GOST 8273−75, must be Packed in solid wooden boxes of type I according to GOST 18617−83 or technical documentation approved in the established order.

It is allowed to apply a different method of packaging in wooden boxes to ensure the safety of the wire.

Weight of packaging must not exceed 20 kg.

5.2. Transport marking — according to GOST 14192−96.

5.3. Storage and transportation of wire of palladium-tungsten alloy is carried out in the manner prescribed for storage and transportation of precious metals, approved by the Ministry of Finance of the USSR. Storage conditions in terms of the impact of climatic factors — according to GOST 15150−69, group 1 (L).

5.1−5.3. (Changed edition, Rev. N 1).

6. MANUFACTURER’S WARRANTY

6.1. The manufacturer guarantees the conformity of the wire of palladium-tungsten alloy to the requirements of this standard, subject to consumer storage conditions.

Guaranteed storage life of wire — 15 years from date of manufacture.

(Changed edition, Rev. N 1).

ANNEX 1 (mandatory).

ANNEX 1
Mandatory

1. Method for chemical analysis of palladium-tungsten alloy

1.1. THE ESSENCE OF THE METHOD

The essence of the method consists in the determination of palladium based on reverse titration of palladium ions by Trilon B in the presence of the indicator — kylinalove orange.

Mass fraction of tungsten is calculated by difference between 100% and a mass fraction of palladium.

2. General requirements

2.1. General requirements for method of analysis according to GOST 22864−83.

3. Equipment, reagents, solutions

Laboratory scales General purpose of the 2nd class according to GOST 24104−88.

Conical flasks with a capacity of 250 cmaccording to GOST 1770−74.

Pipettes with a capacity of 10, 20, 25 cmaccording to GOST 1770−74.

Burette with automatic zero setting capacity of 50 cm.

Nitric acid GOST 4461−77.

Hydrochloric acid by the GOST 3118−77.

A mixture of acids, consisting of one volume of nitric acid and three volumes of hydrochloric acid.

Disodium salt of ethylenediaminetetraacetic acid 2-water (Trilon B) according to GOST 10652−73; solution concentration of 0.075 mol/DMis prepared as follows: 27.7 g of salt is dissolved by heating in 500 cmof distilled water. After cooling, the solution volume is brought to 1000 cmand mixed. Simultaneously cook 20 DMsolution.

Zinc acetate according to GOST 5823−78; solution of concentration 0.1 mol/DMis prepared as follows: to 9.15 g of salt are dissolved in 400 cmof distilled water, add 10 cmof acetic or hydrochloric acid, bring the solution to 1 DMwith distilled water and mix.

Acetic acid GOST 61−75.

Sodium acetate according to GOST 199−78, 50% solution; prepared as follows: 500 g of salt dissolved in 700 cmof distilled water and then the solution volume was adjusted to 1 DM. Simultaneously cook 10 DMof solution.

Selenology orange (indicator), 0,2% solution; prepared as follows: 2 g of the indicator is dissolved in 500 cmof distilled water, add 5 cmof hydrochloric acid (1:1) solution adjusted to 1 DM. After 5 days, filter out the insoluble precipitate. The solution is expendable.

Palladium brand of 99.99 GOST 13462−79.

Palladium standard solution; is prepared as follows: the linkage of palladium with a mass of 4 g was placed in a conical flask with a capacity of 250 cm, and heating is dissolved in 100 cmof a mixture of acids, is evaporated to 15 cmand transferred to volumetric flask with a capacity of 500 cm. The solution volume was adjusted to mark with distilled water and mix. 1 cmof the solution contains 0,0080 g of palladium.

Sec. 3. (Changed edition, Rev. N 1).

4. Preparation for assay

4.1. Setting the ratio of Trilon B with acetic acid zinc

In a conical flask with a capacity of 250 cmpipetted 10 cmTrilon B, add 30 cmof distilled water, 20 cmof a solution of sodium acetate, 10 drops of the indicator — kylinalove orange and titrated with a solution of zinc acetate until the color changes from yellow to bright crimson.

Calculation of the ratio () is calculated by the formula

,

where 10 is the volume of Trilon B, cm;

 — the amount of acetate zinc, expended for titration of Trilon B, cm;

4.2. The installation of the mass concentration of the solution Trilon B at the palladium

In a conical flask with a capacity of 250 cmpipetted 25 cmstandard solution of palladium added by pipette 40 cmof the solution Trilon B, 20 cmof a solution of sodium acetate, 10 drops of the indicator — kylinalove orange and titrated with a solution of carbonate of zinc until the color changes from yellow to bright red.

The mass concentration of the solution Trilon B at the palladium, g/cm, is calculated by the formula

,

where of 0.2000 is the mass of palladium, taken on the installation of the mass concentration of the solution Trilon B at the palladium, g;

40 — volume of solution Trilon B, cm;

 — the volume of solution of acetate of zinc, consumed in the titration of excess Trilon B, cm;

the ratio of Trilon B with acetic acid and zinc.

4.1, 4.2. (Changed edition, Rev. N 1).

4.3. Preparation of sample

A portion of the alloy with a mass of 0.25 g is placed in a conical flask with a capacity of 250 cm, was dissolved with heating in 30 cmof a mixture of acids. The solution is evaporated to a syrupy condition and cooled.

5. Analysis

To the cooled sample solution is added by pipette 40 cmTrilon B, and then to establish рН5 add 40 cmof a solution of sodium acetate, 10 drops kylinalove orange indicator and titrated with a solution of acetate of zinc to change the color of the solution from yellow to bright red.

6. Processing of the results

6.1. Mass fraction of palladium () in percent is calculated by the formula

,

where 40 is the volume of Trilon B, cm;

the ratio of Trilon B with acetic acid and zinc;

 — the volume of acetate of zinc, consumed in the titration of excess Trilon B, cm;

 — mass concentration of the solution Trilon B at the palladium, g/cm;

0,25 — hanging alloy,

(Changed edition, Rev. N 1).

6.2. Permissible differences between results of the parallel definitions should not exceed 0.30 percent at a confidence level of 0.95.

ANNEX 2 (mandatory). DETERMINATION OF TEMPERATURE COEFFICIENT OF RESISTANCE OF WIRE

ANNEX 2
Mandatory

1. Equipment and materials

Thermostat zero or Dewar vessels to reproduce the melting temperature of ice.

A boiler or steam thermostat for keeping the sample at 100 °C.

The platinum resistance thermometer and a mercury thermometer that provides temperature measurement accuracy of 0.01°C.

Install potentiometric 0002 class GOST 9245−79 to measure the voltage drop across the sample to calculate the resistance.

2. Preparing for the test

The test sample is mounted in a resistance thermometer. The sample in the form of a loop of wire welded to the two silver conductors of diameter 0.4−0.5 mm, isolated from each other porcelain capillaries and washers.

The sample is welded to the conductors placed in a quartz case.

3. Testing

The sample in the pouch is placed in a thermostat and allowed to stand prior to each measurement, 20 min.

First, measure the voltage drop across a standard coil and then on the sample.

4. Processing of the results

Temperature coefficient of resistance, Ω, is calculated in the following way:

1) first, calculate the resistance according to the formula

,

where is the voltage applied to the sample at 0 °C, the boiling point of water, mV;

 — the voltage on the coil model, mV;

 — a valid model coil resistance, Ohm;

2) then calculate (grad):

,

 — the resistance of the sample at the boiling point of water, Ohm;

 — the resistance of the sample at 0 °C, Ohm;

 — the boiling point of water, °C.

The measurement is performed with the accuracy up to the sixth sign.

Sec. 4. (Changed edition, Rev. N 1).

APPENDIX 3 (reference). PHYSICO-MECHANICAL PROPERTIES OF THE WIRE OF PALLADIUM-TUNGSTEN ALLOY

APPENDIX 3
Reference

Thermo-electromotive force (TEDS) in pair with copper in the temperature range 0 °C — 100 °C µv/°C	Elongation, %, not less
6	15
Note. Elongation was determined on a soft wire 0.2 mm in diameter.

ANNEX 4 (reference). THE OPERATING CONDITIONS OF A WIRE OF PALLADIUM-TUNGSTEN ALLOY

ANNEX 4
Reference

Name of the indicator	Value
Ambient temperature, °C	From -60 to +150
Relative humidity at a temperature of 35 °C, %	98
The minimum pressure, mm Hg.St.	10
Resistance to aggressive environments	As for precious metals
Mechanical action in the range from 1 to 5000 Hz, m/s	400

ANNEX 4. (Changed edition, Rev. N 1).