| 摘要 |
PURPOSE:To form an inside surface coating layer having excellent heat insulating, refractory and water resistant characteristics by connecting a swiveling feed pipe and suction pipe for raw materials to the apertures at both ends of an exhaust apparatus for an exhaust gas and formed a refractory heat insulating layer consisting of an inorg. binder, refractory heat insulating material, and refractory material, refractory layer and protective layer consisting of a slurry of an inorg. binder and protective material. CONSTITUTION:The swiveling feed pipe and suction pipe are connected to the apertures at both ends of the exhaust manifold of an internal combustion engine and an aq. soln. of 20-60wt% concn. of sodium silicate is swiveled and sucked in the form of a mist to the inside surface of the manifold. Powder of the refractory heat insulating material such as pearlite is blown immediately thereafter and is stuck to the binder layer. The stuck powder is solidified by heating. The refractory layer consisting of the inorg. binder and refractory material such as zirconia is similarly formed thereon and thereafter the slurry consisting of the refractory material powder contg. the above- mentioned inorg. binder is stuck thereon and is solidified by heating to form the protective layer. The layer is heated for 5-120min at 800-1,000 deg.C, by which the inside surface coating layer is formed.
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