nickel based superalloy

Posts tagged nichrome wire

Nichrome general properties

Apr19
2013 Written by admin
Material property Value Units
Modulus of elasticity 2.2 × 1011 Pa
Specific gravity 8.4 g/cc
Density 8400 kg/m3
Melting point 1400 °C
Electrical resistivity at room temperature 1.0 × 10−6 to 1.5 × 10−6 Ωm
Specific heat 450 Jkg−1°C−1
Thermal conductivity 11.3 Wm−1°C−1
Thermal expansion 14 × 10−6 °C−1
@Standard ambient temperature and pressure.

Posted in Nichrome wire pages

Nichrome wire in glass fusing

Apr19
2013 Written by admin

glass-fusingGlass fusing is a glass fabrication technique which involves heating glass in a kiln until it reaches the point where it is soft, which allows the manipulation of the glass in a variety of ways. It is used in industrial glass manufacturing to produce specialised glass laminates but is best known as a ‘creative’ process.

Due to the good malleability of nichrome wire it is easily formed onto various shapes and latices that can be fused between layers of glass, for artistic effect, in the kiln.

Nichrome wire is also the perfect choice for fusing into glass objects where some kind of mounting mechanism is required like a hanging mount in a wall plaque or the attachments in glass jewellery. Although the nichrome wire discolours, becoming dull, during the firing process it is easily polished to regain its appearance.

Posted in Nichrome wire uses - Tagged ,

Nichrome wire – Flame testing

Apr19
2013 Written by admin

Nichrome wire is often used as an alternative to platinum for flame testing.

Flame testing can be used to identify the presence of a small number of metal ions in a compound (Not all metal ions give flame colours).

Flame tests are usually by far the easiest way of identifying Group 1 compounds to see which metal is present. For other metals, there are usually other methods which are more reliable – but the flame test can give a useful hint as to where to look.

The process involves cleaning the platinum or nichrome wire with concentrated hydrochloric acid and placing it in a flame until no colour is produced. Then the wire is dipped in the acid again and then into the compound to be tested and placed back in the flame. Different compounds produce different flame colours.

Platinum is the best choice for flame testing as it produces no colour whereas Nichrome wire will always produce a very slight orange tint in the flame, but due to the high cost of platinum Nichrome wire is often used.

 

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Nichrome wire – Hot wire foam cutters

Mar07
2013 Written by admin

NiChrome Wire is the optimal wire choice for foam cutters for a variety of reasons, but particularly because it is resistant against corrosion and oxidation at very high temperature.

There are two readily available types of wire, NiChrome A & NiChrome C

  • Nichrome A contains 80% Nickel and 20% Chromium
  • Nichrome C contains 60% Nickel, 16% Chromium, & 24% Iron

By comparison, there isn’t too much different between the two wires with the exception of the following

  • Nichrome C has a little higher resistance per foot
  • Nichrome C increases more resistance per foot as temperature increases
  • Nichrome A has higher tensile strength
  • Nichrome A has a higher melting point

Based on this information it would appear that NiChrome A is better to use, but as it stands NiChrome C is a bit easier to acquire and a bit cheaper. But practically speaking, there is not much functional difference between the two when it comes to cutting foam.

Approximate amperage you will need to heat a straight oxidized wire in air to the specified temperature.

Temperature °F

 400 600 800 1000 1200 1400 1600 1800 2000

Temperature °C

 205 315 427 538 649 760 871 982 1093
gauge Dia (in) Amperes
14 .0641 8.4 11.6 15 18.8 23.5 29 34.6 40.5 46
15 .0571 7.2 10 12.8 16.1 20 24.5 29.4 34.3 39.2
16 .05108 6.4 8.7 10.9 13.7 17 20.9 25.1 29.4 33.6
17 .0453 5.5 7.5 9.5 11.7 14.5 17.6 21.1 24.6 28.1
18 .0403 4.8 6.5 8.2 10.1 12.2 14.8 17.7 20.7 23.7
19 .0359 4.3 5.8 7.2 8.7 10.6 12.7 15.2 17.8 20.5
20 .0320 3.8 5.1 6.3 7.6 9.1 11 13 15.2 17.5
22 .0253 2.9 3.7 4.5 5.6 6.8 8.2 9.6 11.0 12.5
24 .0201 2.2 2.9 3.4 4.2 5.1 6.0 7.1 8.2 9.4
26 .0159 1.7 2.1 2.6 3.2 3.8 4.5 5.3 6.1 6.9
28 .0126 1.2 1.6 2.0 2.4 2.9 3.4 3.9 4.5 5.1
30 .0100 .92 1.2 1.5 1.8 2.1 2.5 2.9 3.3 3.7
32 .0080 .68 .90 1.1 1.4 1.6 1.9 2.2 2.5 2.8
34 .0063 .50 .68 .83 1.0 1.2 1.4 1.6 1.8 2.0
36 .0050 .38 .52 .63 .77 .89 1.0 1.2 1.3 1.5
38 .0040 .30 .41 .50 .59 .68 .78 .88 .98 1.1
40 .0031 .24 .31 .36 .43 .50 .57 .64 .72 .79

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Nichrome C (or NiCrC)

Mar07
2013 Written by admin

Nichrome C (or NiCrC) is an alloy containing:

61% Nickel (Ni), 15% Chromium (Cr), and the balance is made up of Iron ( Fe)

Approx. Melting Point: 1350 deg C

This is almost identical in composition to Chromel C

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Nichrome A (or NiCrA)

Mar07
2013 Written by admin

Nichrome A (or NiCrA) is and alloy that contains contains:

80% Nickel and 20% Chromium

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Nicrome wire resistance chart

Mar05
2013 Written by admin

Below are a selection of resistance tables for various common compositions of Nichrome.

Nicrome wire resistance chart (Ni80% CR20%)

Dia (mm) Sectional Area (mm²) Ω/m,20℃
0.10 0.007854 138.8
0.12 0.01131 96.38
0.15 0.01767 61.68
0.17 0.02270 48.02
0.19 0.02835 38.44
0.21 0.03464 31.47
0.25 0.04909 22.21
0.27 0.05726 19.04
0.29 0.06605 16.50
0.31 0.07548 14.44
0.35 0.09621 11.33
0.40 0.1257 8.674
0.45 0.1590 6.835
0.50 0.1963 5.551
0.60 0.2827 3.855
0.70 0.3848 2.832
0.80 0.5027 2.168
0.90 0.6362 1.713
1.00 0.7854 1.388
1.20 1.131 0.9638
1.40 1.539 0.7081
1.60 2.011 0.5421
1.80 2.545 0.4283
2.00 3.142 0.3470
2.20 3.801 0.2867
2.50 3.976 0.2741
2.80 6.158 0.1770
3.00 7.069 0.1542
3.50 9.621 0.1133
4.00 12.57 0.08674
4.50 15.90 0.06853
5.00 19.63 0.05551
5.50 23.76 0.04588
6.00 28.27 0.03855
6.50 33.18 0.03285
7.00 38.48 0.02832

Nicrome wire resistance chart (Ni70% CR30%)

Dia (mm) Sectional Area (mm²) Ω/m,20℃
0.10 0.007854 150.2
0.12 0.01131 104.3
0.15 0.01767 66.77
0.17 0.02270 51.99
0.19 0.02835 41.62
0.21 0.03464 34.07
0.25 0.04909 24.04
0.27 0.05726 20.61
0.29 0.06605 17.86
0.31 0.07548 15.63
0.35 0.09621 12.26
0.40 0.1257 9.390
0.45 0.1590 7.419
0.50 0.1963 6.010
0.60 0.2827 4.173
0.70 0.3848 3.066
0.80 0.5027 2.348
0.90 0.6362 1.855
1.00 0.7854 1.502
1.20 1.131 1.043
1.40 1.539 0.7665
1.60 2.011 0.5869
1.80 2.545 0.4637
2.00 3.142 0.3756
2.20 3.801 0.3104
2.50 3.976 0.2968
2.80 6.158 0.1916
3.00 7.069 0.1669
3.50 9.621 0.1226
4.00 12.57 0.09390
4.50 15.90 0.07419
5.00 19.63 0.06010
5.50 23.76 0.04967
6.00 28.27 0.04173
6.50 33.18 0.03556
7.00 38.48 0.03066

Nicrome wire resistance chart (Ni60% CR15%)

Dia (mm) Sectional Area (mm²) Ω/m,20℃
0.10 0.007854 142.6
0.12 0.01131 99.03
0.15 0.01767 63.38
0.17 0.02270 49.34
0.19 0.02835 39.50
0.21 0.03464 32.34
0.25 0.04909 22.82
0.27 0.05726 19.56
0.29 0.06605 16.96
0.31 0.07548 14.84
0.35 0.09621 11.64
0.40 0.1257 8.913
0.45 0.1590 7.042
0.50 0.1963 5.704
0.60 0.2827 3.961
0.70 0.3848 2.910
0.80 0.5027 2.228
0.90 0.6362 1.761
1.00 0.7854 1.426
1.20 1.131 0.9903
1.40 1.539 0.7276
1.60 2.011 0.5570
1.80 2.545 0.4401
2.00 3.142 0.3565
2.20 3.801 0.2946
2.50 3.976 0.2817
2.80 6.158 0.1819
3.00 7.069 0.1584
3.50 9.621 0.1164
4.00 12.57 0.08913
4.50 15.90 0.07042
5.00 19.63 0.05704
5.50 23.76 0.04714
6.00 28.27 0.03961
6.50 33.18 0.03375
7.00 38.48 0.02910

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