巻号一覧
前身誌
1978 巻, 153 号
選択された号の論文の6件中1～6を表示しています
- |<
- <
- 1
- >
- >|
-
金澤 孝文, 梅垣 高士, 徳永 恭之, 木村 陽一1978 年 1978 巻 153 号 p. 53-60
発行日: 1978/03/01
公開日: 2011/03/07
ジャーナル フリーThe dissolution rates of hydroxyapatites with various Ca/P molar ratios were determined by the volume decrease of the apatites with a spring balance, the shrinkage of which was measured after the dissolution of the apatites in acid solvents such as HCl and citric acid (pH=1-2).
Most apatites with Ca/P molar ratios of 1.5-1.8 were precipitated by mixing a Ca (NO3) 2 solution and an (NH4) 2HPO4 solution in various Ca/P molar ratios (1.5-3.4) at 88-89°C. The X-ray diffraction pattern of a-Ca3 (PO4) 2 appeared in that of hydroxyapatite after the heat-treatment (800°C-or 1000°C-1 hr) of some precipitated apatites.
There was no change of the dissolution rates with Ca/P of the apatites, and the rates depended on the concentration of H+ of solvents. At the initial stage of the dissolution, the Ca/Pof the liquid phase in which the apatites dissolved was found to be greater than that in the residual part of the apatites.抄録全体を表示PDF形式でダウンロード (800K) -
瀬戸山 克己, 高橋 聡1978 年 1978 巻 153 号 p. 61-65
発行日: 1978/03/01
公開日: 2011/03/07
ジャーナル フリーParticle disintegration of calcium sulfate hemihydrate in water has been studied by Smith1) and Lane2), 3) . The present report describes some of the fundamental experiments on this problem by measuring particle size distribution, water demand, the Blain specific surface area and size of crystallite.
The particles of β-CaSO4·1/2H2O disintegrated into tiny fragments when stirred vigorously in water, while those of α-CaSO4·1/2H2O did not show disintegration. This phenomenon did not occur in other liquids of larger molecules than H2O, which verified that it was not due to grinding or dissolution of particles. These facts indicated the presence of the difference in microstructure between α-and β-forms. Disintegrability of insoluble anhydrite was almost extinguished probably because of its crystal structure of higher symmetry and stability than those of the hemihydrates. The relation between particle disintegrability of the hemihydrates and the calcination conditions thereof was discussed. It was found that, with respect to particle disintegrability, the β-hemihydrate, being aged, became similar to the α-hemihydrate.抄録全体を表示PDF形式でダウンロード (1045K) -
関谷 道雄1978 年 1978 巻 153 号 p. 67-74
発行日: 1978/03/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (831K) -
石原 信一1978 年 1978 巻 153 号 p. 75-80
発行日: 1978/03/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (1356K) -
種村 文数, 鍋田 恒之, 本多 徹1978 年 1978 巻 153 号 p. 80-89
発行日: 1978/03/01
公開日: 2011/03/07
ジャーナル フリーThe high temperature zone of lime kiln is mainly occupied by magnesia-chrome brick, but the quality of magnesia-chrome brick depending upon the grade of natural chromite is coming to the limit of quality owing to its qualitative defects caused by natural chromite although the manufacturing technology was greatly improved besides the raw materials.
Synthetic basic brick is epoch-making basic brick due to high purity synthetic bond having overcome the wall of quality of magnesia chrome by using synthetic special spinel clinker instead of chromite. The use of such synthetic basic brick instead of all kinds of magnesia-chrome bricks will promise a great development of brick life.抄録全体を表示PDF形式でダウンロード (2110K) -
馬場 明生1978 年 1978 巻 153 号 p. 89-92
発行日: 1978/03/01
公開日: 2011/03/07
ジャーナル フリーPDF形式でダウンロード (442K)
- |<
- <
- 1
- >
- >|