JPS6128060A - Ceramic fiber blanket and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ceramic fiber blanket that has significantly improved strength in the thickness direction and has a uniform thickness, and a method for manufacturing the same.

[Conventional technology]

As a conventional method for manufacturing ceramic fiber blankets, for example, according to Japanese Patent Publication No. 52-43946,
``A method for treating a single-layered ceramic fiber assembly, which is characterized by subjecting a single-layered ceramic fiber assembly containing an anti-friction agent to needle punching and then removing the anti-friction agent'' has been used.

[Problem that the invention seeks to solve]

The ceramic fiber blanket manufactured by the above conventional method has a uniform thickness because it has been subjected to a needling process, but the interlaminar strength in the thickness direction is weak in the areas where fibrous loops do not exist, and there are partial interlaminar It has the disadvantage of causing peeling.

The present invention aims to solve these drawbacks of the prior art, and achieves its purpose by providing a ceramic fiber blanket and a method for manufacturing the same as set forth in the claims.

[Means for Solving the Problems and Their Effects] The ceramic fiber blanket of the present invention and its manufacturing method will be explained in detail below with reference to the drawings. Figure 1 shows a longitudinal section of the ceramic fiber blanket of the present invention.
FIG. 2 is a longitudinal cross-section of a conventional ceramic fiber blanket. As shown in Figure 2, conventional ceramic fiber blankets have a structure in which the fibers are entangled only on the back side due to needling, which has the disadvantage of poor interlayer strength and easy delamination. .

Therefore, the ceramic fiber blanket of the present invention 1. By continuously dotting a large number of fibrous loops 2 formed by needling from the surface A to the back surface B with overlapping at least their tips, the interlaminar strength is significantly improved and there is no delamination at all. It no longer occurs.

In the present invention, if the number of needle loops is less than 5 per square centimeter, the blanket will not have sufficient interlaminar strength, and if it is more than 20, fiber destruction due to needling will be significant and the tensile strength of the blanket will decrease, so it is preferable. do not have.

Next, connect multiple continuous needle loops from the front side of the blanket to the back side.3. If the number of pairs is less than 1 pair per square centimeter, the blanket will not have sufficient interlayer strength and delamination will occur.

FIG. 3 shows a needle board in which a continuous series of needle loops is formed in the thickness direction of the blanket. FIG. 4 shows an enlarged view of the tip of the needle.

The ceramic fiber is caught only by the barb 4 at the tip of the needle, forming a fibrous loop 2 in the longitudinal direction. Therefore, in conventional ceramic fiber blankets that used one type of needle (with the same tip barb position), the fibrous loops were concentrated only on the back side. Therefore, by intentionally changing the position of the tip barb 4 of the needle, it has become possible to uniformly form fibrous loops in each layer in the thickness direction of the blanket. That is, according to the present invention, uniform fibrous loops can be formed in each layer in the thickness direction by using several types of needles with different lengths or by changing the depth of the groove in which the needles are fixed.

〔Example〕

A blanket-like laminate of ceramic fibers was subjected to needling using a needle board in which five types of needles of different lengths were implanted, and the tensile strength and interlayer properties of the blanket were determined when the blanket was fired at 600°C. The strength was as follows. In addition, examples outside the scope of the examples of the present invention are also shown as comparative examples [7].

The interlaminar strength of the blanket was determined by measuring the time required for the blanket to break using a testing machine as shown in FIG. The blanket (1) is vibrated in the left-right direction of the arrow to cause delamination and the time required until the blanket is cut is measured.

Table 1 "] [ 1.

[Effects of the Invention] As described above, according to the present invention, a ceramic fiber blanket with significantly improved interlaminar strength can be provided, and it can be used as a heat insulating material (durable ).

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a ceramic fiber blanket of the present invention, FIG. 2 is a longitudinal sectional view of a conventional blanket,
FIG. 3 is a schematic diagram of the needling device used in the present invention,
FIG. 4 is an enlarged view of the tip of the needle, and FIG. 5 is a side view of a testing machine for measuring the needling effect.

Claims (1)

[Scope of Claims] 1. A blanket of ceramic fibers, characterized in that each layer in the thickness direction of a blanket-like laminate of ceramic fibers is dotted with a large number of woven loops formed by needling. 2. A patent characterized in that the loops are spaced apart from each other at regular intervals, are overlapped at least at their tips, and are continuously scattered from the front surface to the back surface of the laminate. A ceramic fiber blanket according to claim 1. 3. The ceramic fiber blanket according to claim 1 or 2, wherein the number of loops is at least 5 to 20 per square centimeter in the planar direction of the laminate. 4. A series of loops from the front surface to the back surface of the laminate,
A blanket of ceramic fibers according to claims 1 to 3, characterized in that there is one or more pairs, preferably 3 to 4 pairs, per centimeter in the planar direction. 5. The fibrous loops are introduced in the thickness direction of the laminate using a needle board in which at least the tip barbs of the needles are unevenly distributed at regular intervals in the thickness direction of the laminate. How to make blankets.