IX. THERMAL EXPANSIVITY OF SOLIDS
IX. THERMAL EXPANSIVITY OF SOLIDS
IX. THERMAL EXPANSIVITY OF SOLIDS
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. . ._ __ . . . _. -<br />
<strong>THERMAL</strong> EXPANSION <strong>OF</strong> INVAR<br />
Sources of Data: Beenakker and Swenson 1955<br />
Other References : Chevenard 1914<br />
Gregg 1954<br />
Masumoto 1934<br />
Molby 1912<br />
Scheel 1921<br />
Discussion:<br />
Temp<br />
0<br />
K<br />
0<br />
10<br />
20<br />
30<br />
40<br />
50<br />
60<br />
70<br />
80<br />
90<br />
100<br />
120<br />
The expansions of the Invar alloys are<br />
sensitive to composition and heat treat-<br />
ment. The above data are for an alloy<br />
believed to be 42 Ni, 0.8 Mn, bal. Fe,<br />
annealed (Lloyd B. Nesbitt, Private<br />
Communication). Although Beenakker and<br />
Swenson referred to this as "Invar", this<br />
composition approximates the alloy, Dumet,<br />
used for sealing to glass. In the iron-<br />
nickel alloy system, the minimum value of<br />
room temperature expansion coefficient<br />
occurs at about 36% Ni.<br />
Table of Selected Values<br />
- L<br />
L293 T<br />
52<br />
52<br />
52<br />
52<br />
52<br />
52<br />
52<br />
51<br />
50<br />
49<br />
47<br />
43<br />
L293<br />
Taken from NBS 29 <strong>IX</strong>-K-1<br />
11<br />
II<br />
II<br />
I1<br />
11<br />
II<br />
II<br />
II<br />
II<br />
II<br />
II<br />
Temp.<br />
0<br />
K<br />
140<br />
160<br />
180<br />
20 0<br />
220<br />
240<br />
2 60<br />
273<br />
280<br />
293<br />
300<br />
L - L<br />
2 93 T<br />
L293<br />
II 34<br />
I1 29<br />
II 23<br />
II 18<br />
II 14<br />
8.6 'I<br />
5.2 I'<br />
3.4 II<br />
0<br />
-1.8 'I
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