All issues
Volume 72 (1964)
- Issue 831 Pages 1-
- Issue 830 Pages 233-
- Issue 829 Pages C733-
- Issue 828 Pages 193-
- Issue 827 Pages 169-
- Issue 826 Pages 143-
- Issue 825 Pages 121-
- Issue 824 Pages 107-
- Issue 823 Pages 93-
- Issue 822 Pages 91-
- Issue 821 Pages 105-
- Issue 820 Pages C151-
- Issue 819 Pages 87-
- Issue 818 Pages 87-
- Issue 817 Pages 113-
Volume 64 (1956)
- Issue 732 Pages 263-
- Issue 731 Pages 235-
- Issue 730 Pages 1-
- Issue 729 Pages 211-
- Issue 728 Pages 183-
- Issue 727 Pages C337-
- Issue 726 Pages 151-
- Issue 725 Pages C265-
- Issue 724 Pages 135-
- Issue 723 Pages 103-
- Issue 722 Pages 65-
- Issue 721 Pages 95-
- Issue 720 Pages C45-
- Issue 719 Pages 31-
- Issue 718 Pages 37-
Volume 62 (1954)
- Issue 703 Pages 741-
- Issue 702 Pages 693-
- Issue 701 Pages 645-
- Issue 700 Pages 595-
- Issue 699 Pages 543-
- Issue 698 Pages 491-
- Issue 697 Pages 447-
- Issue 696 Pages 359-
- Issue 695 Pages 314-
- Issue 694 Pages 231-
- Issue 693 Pages 149-
- Issue 692 Pages 77-
- Issue 691 Pages 18-
- Issue 2Supplement Pag･･･
- Issue 1Supplement Pag･･･
Volume 61 (1953)
- Issue 690 Pages 593-
- Issue 689 Pages 521-
- Issue 688 Pages 473-
- Issue 687 Pages 403-
- Issue 686 Pages 359-
- Issue 685 Pages 289-
- Issue 684 Pages 245-
- Issue 683 Pages 196-
- Issue 682 Pages 143-
- Issue 681 Pages 99-
- Issue 680 Pages 53-
- Issue 679 Pages 12-
- Issue 2Supplement Pag･･･
- Issue 1Supplement Pag･･･
- Issue Appendix Pages ･･･
Volume 71, Issue 812
Displaying 1-12 of 12 articles from this issue
- |<
- <
- 1
- >
- >|
-
Tadasi NISINO, Kesakichi MOTEKI, Hirosi SIKANO1963 Volume 71 Issue 812 Pages 159-163
Published: 1963
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA wet process for the preparation of MgCrO4⋅7H2O, which is applicable to a binder of basic refractories as an excellent substitute for MgCl2⋅ or MgSO4, was investigated.
The thermal decomposition of magnesium chromate hydrates and anhydrate was studied by using DTA, TGA and X-ray diffraction.
The following results are obtained
(1) MgCrO4⋅7H2O is prepared by crystallization from a solution of MgO, Mg(OH)2 or MgCO3 in chromic acid, which is thermally decomposed to give MgCrO4.
This method is preferable to a dry process which needs oxygen pressure of 12 atm. and heating temperature of 420°C.
(2) In dehydration of the heptahydrate, the four separate reactions distinguished in this work have been attributed to the following:
MgCrO4⋅7H2O=MgCrO4⋅5H2O+2H2O (DTA peak temp. 33° & 58°)
MgCrO4⋅5H2O=MgCrO4⋅1.5H2O+3.5H2O (DTA peak temp. 127° & 150°)
MgCrO4⋅1.5H2O=MgCrO4⋅H2O+0.5H2O(DTA peak temp. 196° & 215°)
MgCrO4⋅H2O=MgCrO4+H2O(DTA peak temp. 335°)
(3) The decomposition of MgCrO4 anhydrate begins at about 600°C and obeys a first-order law. The value of activation energy determined by isothermal decomposition is about 74kcal/mol.View full abstractDownload PDF (757K) -
Hiroshi OHBA, Kiyoshi SUGITA1963 Volume 71 Issue 812 Pages 163-168
Published: 1963
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA new type of slagging test menthod for basic refractories, Slagging-under-Load Test, was proposed.
The test is a kind of hot creep test with slagging. The procedure of this test is as follows.
A columnar crucible made of specimen with the size of 50mm in diameter and 50mm in height and with the hole size of 20mm in diameter and 30mm in depth, is filled with slag powder.
The slag-filled specimen is heated at a uniform rate up to a test temperature, at which the specimen is maintained and a compressive load is applied. The rate of subsidence of specimen is measured in the similar manner to refractoriness-under-load test.
This test is based on the fact that the slagging resistance of basic refractories must be determined both by the tendency of slag penetration and by the change in refractoriness with slag absorption. Some examples of the test applied to the evaluation of basic bricks for oxygen converter and mixer lining were given.View full abstractDownload PDF (2276K) -
Yoshiro MORIYA, Tsutomu UENO1963 Volume 71 Issue 812 Pages 169-175
Published: 1963
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSEffects of devitrification on electrical properties of glasses were studied. Before and after devitrification of phosphate glasses containing titanium ions, electrical conductivities, dielectric constants and tan δ were measured. The results are summarized as follows.
The conductivity increased and the activation energy for conduction decreased after devitrification. The amount of these changes increased with the degree of devitrification in the same composition.
The dielectric constant and tan δ increased and this tendency was more remarkable at lower frequencies.
The above-mentioned phenomena were likely to be attributed to the valence exchange of coexisting Ti3+ and Ti4+ ions, which was enabled more readily to occur in the liberated crystal phases. In fact, the same phenomena were observed in case of phosphate glasses containing wolfram ions, where W5+ and W6+ are supposed to be coexisting.
The addition of small quantity of iron ions acted to suppress the increase in conductivity of devitrified glass.
In devitrified glass, the log σ-1/T curve was not always linear. Where the residual glassy phase existed, it approached gradually to the line of the original glass with increasing temperature.View full abstractDownload PDF (1151K) -
1963 Volume 71 Issue 812 Pages A37-A42
Published: 1963
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1384K) -
[in Japanese]1963 Volume 71 Issue 812 Pages C385-C395
Published: 1963
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (4478K) -
[in Japanese]1963 Volume 71 Issue 812 Pages C397-C404
Published: 1963
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (8386K) -
[in Japanese]1963 Volume 71 Issue 812 Pages C405-C411
Published: 1963
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (3542K) -
1963 Volume 71 Issue 812 Pages C412
Published: 1963
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (269K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1963 Volume 71 Issue 812 Pages C413-C416
Published: 1963
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (867K) -
[in Japanese]1963 Volume 71 Issue 812 Pages C417-C422
Published: 1963
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1122K) -
1963 Volume 71 Issue 812 Pages C423-C430
Published: 1963
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (7306K) -
1963 Volume 71 Issue 812 Pages C445-C448
Published: 1963
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (4858K)
- |<
- <
- 1
- >
- >|