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Na2O-PbO-SiO2-Bi2O3 4成分系ガラスにおける軟化および流動性
| Content Provider | Semantic Scholar |
|---|---|
| Author | 松下 徹. |
| Copyright Year | 1976 |
| Abstract | It is the purpose of this paper to investigate suitable chemical compositions of the glasses in the system Na20-PbO-SiO2-Bi203 for the binder glass of the glass bonded fluorphlogopite mica. Softening temperature T, [viscosity approx. 5 x 107 poise] and fluidifying temperature T2 [viscosity approx. 3× 102 poise] of glass were measured by use of a simple method, and B, a value proportional to the activation energy of glass viscosity, was calculated by the equation of viscosity: rp;A exp. (BIT). ln this study the effects of glass composition on Ti, T2, B and undevitrifying property of the glasses in the system .xNE 20・(!-x)PbO・(!-y)SiO2’YBiO3/2 [OSx;:iSO.7, O$ySO.7] were examined. In the cases of high value for x and low value for y, low for t and high for y and high for both of x and y, Na2SiO3, an unknown compoucl and both of cr-PbO2 and PbO were respectively separated as crystals from the glasses. As x’ increasecl the change of Ti was srna/l, and T2 and B had a minimum and maximum at O.3’vO.4, O.3一一〇.4, O.2・’一〇.3 and O.2 of x in the case of y = O.!, O.2, O.3 and O.4, respectively・ In the case of x= O, the changes of Ti and T2 were small, and B decreac sed linearly as y increased up to O.3. ln the region above O.5 of y, Ti and T2 attained a constant temperature of 6000e-6!00C, and B increased remarkably. ln the case of x = O.2, O.3 and O.4, T2 and B had a minimum ancl mac ximum at O.3rvO.4, O.3 and O.2 of y, respectively. Since the glasses in the composition range of x = O.1一一〇.4 and y,= OtvO.3 had an undevitrifying property and low values of Ti. and T2, lt is concluded that these glasses are suitable for the binder glass of the glass bonded fiuorphlogopite mica, 1.緒 言 比較的低い融点を有し,化学的に安定なPbO-Sio2系ガラス1)の中で,結晶化しにくく,し かも低融点の組成はPbO・SiO2であった2)。このPbO・SiO2なる組成中のPbOをアルカリ金 属酸化物(Li20, Na20, K,O)2),2価金属酸化物(MgO, ZnO, CdO, CaO)3)などで置換すると, |
| Starting Page | 111 |
| Ending Page | 122 |
| Page Count | 12 |
| File Format | PDF HTM / HTML |
| Volume Number | 79 |
| Alternate Webpage(s) | https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/41346/1/79_111-122.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
