钛合金热加工保护涂层自剥离性研讨

钛合金热保护涂层，主要功能是防止钛合金在加热或热加工过程中的严重氧化．但是在热加工结束后，涂层的去除十分困难，如果能够在不影响保护效果的前题下，使涂层在热加工结束后自动剥离．这将给生产带来极大的方便．讨论由玻璃和粘土组成的不同涂层配方，经过试验和计算，找出构成涂层的二个组份—玻璃及粘土，在涂层使用过程中的不同作用．认为，在加热及热加工阶段，玻璃发挥主要作用，而在加工后的冷却剥离阶段，粘土起主要作用     

氢和氢同位素渗透壁垒层的研究进展

概述了防止氢和氢同位素渗透壁垒层的研究进展,展望了这些壁垒层在钛和钛合金基体上的应用前景.根据钛和钛合金局部热氢处理的实际情况,提出开发一次性自剥落热氢处理用阻止氢和氢同位素渗透的高效壁垒层的必要性与可行性.通过对热氢处理用渗透壁垒层应具备的特性进行分析,认为高Al2O3含量的硅酸盐玻璃陶瓷涂层将是未来研究的重要候选壁垒层.     

An Analysis of the Curling Phenomenon in Viscoelastic Bimaterial Strips

A mathematical analysis is performed to obtain relations for the radius of curvature and flexural moments for initially stretched bimaterial strips in which at least one of the materials exhibits viscoelastic behavior. One practical application of this analysis is for pressure sensitive tapes. Consequently, the radius of curvature and flexural moment relations are obtained as functions of backing and adhesive thicknesses and moduli for typical pressure sensitive tapes. The analysis shows that the flexural moment decreases as the backing thickness and/or backing modulus increase. Furthermore, the flexural moment decreases as the adhesive thickness and/or adhesive modulus decreases.     

Physical Considerations in the Development of Pressure-Sensitive Adhesive Sheets

A pressure-sensitive adhesive sheet is a special kind of paper used in non-impact printers which use a heating process to apply toner to paper. As a result, it needs special characteristics that general pressure-sensitive adhesive paper for labels do not require.

One of these characteristics is that the edge of the folded paper used in non-impact printers must not incline after printing. This was done by making the degree of orientation of the fibers in the face stocks and the release liners low.

The other characteristics are that adhesive must not ooze out from the edges during the slitting or guillotining process and that the labels must not come off of the release liner by themselves during the printing process. Ooze characteristics were found to be related to the adhesive coat weight. An adhesive paper with both a high peel strength and lower adhesive coat weight was developed by studying the dynamic viscoelastic properties of adhesives and release layers. The storage modulus of the release layer concerned with the release force was also found to be related to the self-peeling tendency of the labels.

These points were considered during the development of pressure-sensitive adhesive paper used in non-impact printers which use a heating process to apply toner to paper.     

An Analysis of the Curling Phenomenon in Viscoelastic Bimaterial Strips

A mathematical analysis is performed to obtain relations for the radius of curvature and flexural moments for initially stretched bimaterial strips in which at least one of the materials exhibits viscoelastic behavior. One practical application of this analysis is for pressure sensitive tapes. Consequently, the radius of curvature and flexural moment relations are obtained as functions of backing and adhesive thicknesses and moduli for typical pressure sensitive tapes. The analysis shows that the flexural moment decreases as the backing thickness and/or backing modulus increase. Furthermore, the flexural moment decreases as the adhesive thickness and/or adhesive modulus decreases.