1916 0.0. Van Der biesi 3 Results and discussion Figure 2 shows some examples of laminated tubes consisting of 19 Sic and 18 graphite layers pro- duced by electrophoretic deposition 3.1 Laver thicknes For the first tubes the deposition time was 2 min per SiC layer. Due to depletion of the suspension the deposition rate drops and therefore, the thick ness of the Sic layers de The layer thick () curve so that the deposition time per layer can be adapted in order to obtain layers of equal and pre- selected thickness. To test the master curve, the deposition times were calculated in order to obtain Sic layers of 100 um. The actual average Sic layer Fig. 1. Electrode set-up for electrophoretic deposition of tubes thickness was 95+/-12 um(Fig 3). The equation (a)automated electrode positioner capable of moving the electrodes to one of four suspensions, (b) top PTFE cover, (c) describing the master curve is aphite cylindrical deposition electrode,(d)suspension,(e) stainless steel rod serving as counter electrode, (f bottom FE cover T=T0(1-e-k) suspensions, and is able to move the electrodes where T is the cumulative Sic layer thickness, t is from one suspension to another with a maximum the cumulative deposition time from one suspe of 4 suspensions. Deposition occurs on the inside sion, whilst To(1500 um)and k(0 121 min )are of the graphite cylinder fitting constants determined by fitting to experi Sic layers are obtained by deposition from a mental data. The thickness of the graphite layers suspension of a Sic powder(Superior Graphite, was 10+/-3 um HSC-0598, 50g)in acetone with 5 vol%n butylamine and 20 vol% iso-propyl alcohol. The 3.2 Mechanical testing iso-propyl alcohol is not required for deposition of Figure 4 shows the result of a mechanical test on a SiC, but is added to the acetonic suspension in ring cut from a laminated tube, and Fig. 5 shows order to match the drying rate of the SiC layers the sample after testing. The load-displacement better to the drying rate of the graphite layers, which are deposited from a commercial colloidal graphite suspension(Superior Graphite, N210) based on iso-propyl alcohol and diluted furt with iso-propyl alcohol (70 vol%) A laminated tube is obtained by consecutive deposition of SiC and graphite layers by applying钟时e 145 V so that the graphite deposition electrode is the positive electrode. After deposition of the required number of Sic and graphite layers, the deposit is dried and removed from the electrode The tubes are sintered in a graphite furnace under vacuum at 2050.C for 30 min For evaluation of the layer thickness, the tubes are cut into a number of rings with equal width and the layer thickness is measured using an opti al microscope (LOM). chaliCe evaluation 23×x119×5mm) are tested in diametral compres sion by placing the ring between two parallel hori zontal plates which move towards each other ig. 2. Some examples of SiC/graphite laminated tube while the resulting load is measured with a load sting of 19 SiC layers(95 +/-12 um)and 18 graphite (10+/-3 um). The outer diameter is 23 mm; the inner eter is 19 mm and the length of the standing tube is 35mm